Test/review of Moxom 2 port KH-25

November 23, 2018, 7:32 am

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USB Power Device Reviews

Moxom 2 port KH-25



Official specifications:

• Brand: MOXOM
  
• Model Numer: KH-25
  
• Output Interface: USB
  
• USB Ports: 2
  
• Output: 5V/2.4A
  
• Input: 100-240V
  
• Type: AUTO ID 2.4A
  
• Plug Type: EU Plug
  
• Plug Diameter: 4mm
  

I got it from aliexpress dealer: MOXOM Official Store



A nice plastic box, but it looks like it has been at a warm place.



The box included the charger and a usb cable.












Measurements

• Power consumption when idle is 0.17 watt
  
• Android output is coded as usb charger (DCP)
  
• Apple output is coded as Apple 2.1A
  
• The two outputs are in parallel.
  
• Weight: 51.7g
  
• Size: 90 × 41.6 × 37mm
  

The Android port can deliver about 1.9A



The Apple port is the same.



And together it is also 1.9A



Using 120VAC mains do not change it.



The charger could run for 1 hour delivering 1.8A
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 52.0°C, HS1: 56.1°C



HS1: 57.5°C



M1: 52.4°C, HS1: 54.2°C



HS1: 61.3°C



M1: 49.4°C, HS1: 61.4°C



At 0.5A the noise is 35mV rms and 233mVpp.



At 1A the noise is 53mV rms and 450mVpp.



At 2A the noise is 54mV rms and 331mVpp.



Tear down



Some pressure with my vice at the correct place made the lid pop open.



And it was taken apart.



On this side is the fusible resistor at the mains input, a mains switcher, a safety capacitor and the rectifier diode.









On this side is the bridge rectifier and the blue indicator led . The coding resistors for the Apple coding is also here.





There is a slot in the circuit board, but it would have to be longer to really work, the distance between mains and low volt side is around 2mm, this is way to short.


The charger passed the 2830 volt and 4242 volt test, this means it is it is fairly safe, but as can be seen above it is not safe enough.




Conclusion

The coding is rather old style with fixed Android and Apple, instead of using a DCP coding on both outputs (Apple also knows that coding today), the output current is lower than rated and rather low for a two output charger.
The website shows approval certificates, but they cannot be for this charger with the low distance between mains and low volt side.

The charger do not live up to all the nice work on the website and the box, I will not recommend this charger.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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Test/review of Baseus Smart Car Charger 2xQC 36W BSC-C15K

November 25, 2018, 7:10 am

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Baseus Smart Car Charger 2xQC 36W BSC-C15K



Official specifications:

• Brand: Baseus
  
• Color: Black, Red
  
• USB Port: 2
  
• Material: Aluminum Alloy
  
• Total Power: 36W
  
• Input: DC 12-24V
  
• Output: DC 5V/2.4A, 9V/2A, 12V/1.5A
  
• Certification: RoHS, CCC, CE, FCC, QC 3.0
  

I got it from Banggood



I got it in a small cardboard box with both Chinese and English specifications on it.



The box contained the charger, instruction sheet and a warranty chart with text in both English and Chinese.











Measurements

• Outputs supports Apple 2.4A, Samsung, DCP, QC3, Samsung-AFC, Huawei-FCP, Huawei-SCP
  
• Minimum QC3 voltage is 3.5V
  
• Current consumption when idle is 15mA
  
• There is illuminated ring around the usb connectors.
  
• Weight: 31.0g
  
• Length: 58mm
  
• Diameter: 26mm
  

At 5V the charger can deliver 4A, this is a bit much for a 2.4A charger.



At 9V the charger can deliver 3A before the output voltage drops.



At 12V it is “only” 2.2A, the rating is 1.5A. This curve is with 11.6V input and the output voltage is around 11V, this is acceptable.



With 14V input the voltage is maintained nicely at 12V



With 24V input the maximum current drops a bit, but is still above rated current.



The second output looks similar.





With 0.5A output current the charger can maintain 5V output down to nearly 5V input.





At full 12V current the 12V output can be maintained down to 12.5V input, this is impressive.



The current consumption varies with input voltage and is about 15mA at 12V and 8mA at 24V



For load test I uses 12V 1.5A on both outputs.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 54.2°C, HS1: 55.1°C
With a aluminium body the temperature is fairly uniform on the outside and the good efficiency also means it is low compared to the power it is handling.



M1: 48.5°C, HS1: 55.7°C




Noise at 0.5A output is 40mV rms and 232mVpp



Noise at 1A output is 13mV rms and 118mVpp



Noise at 2.5A output is 11mV rms and 239mVpp



Noise at 0.9A on the QC output is 12mV rms and 120mVpp



Noise at 1.2A on the QC output is 8mV rms and 83mVpp, all low noise values.



Tear down



It was easy enough to screw the back off, but the I could not get the front off, in the end I did some cutting, but not before having damaged the usb connector.



On this side of the circuit board is input and output capacitors and two inductors.





The front has 4 leds to illuminate the ring.



There is nothing on the back.





There is some heat transfer material on top of the chips.



At the 12V input spring is a fuse (F1) and the two QC switcher and controller chips (U1 & U2: I6505), these chips do everything.






Conclusion

It is a very good universal car charger, it can handle most fast charge protocols, it has good efficiency and in this charger it also has low output noise. With the aluminium construction it is solid and the best possible heat transfer. The only detail I am missing is a slightly more strict overload protection.



Notes

The charger was supplied by banggood.com for review.

Read more about how I test USB power supplies/charger

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Test/review of DTU-1705L USB Tester

November 27, 2018, 7:28 am

≫ Next: Test/review of OLAF 5V 2A SUB Fast Charger JC-0060

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DTU-1705L USB Tester



Official specifications:

• Input voltage: DC 4 – 30V
  
• Input current: DC 0 – 5A
  
• Voltage resolution: 0.001V
  
• Current resolution: 0.001A
  
• Voltage accuracy: 0.2% + 2
  
• Current accuracy: 0.3% + 2
  
• Power consumption: 6-10mA
  
• Internal resistance: 55 – 65mOhm
  
• Capacity counter: 0 – 9999.9Ah (Resolution: 0.0001Ah)
  
• Power counter: 0 – 9999.9Wh (Resolution: 0.0001Wh)
  
• Timer range: 0 – 999mins
  
• Interface: USB-A, TYPE-C, Micro USB
  
• Logger capacity: 100 group
  
• Log rate: 0 – 60min
  
• Protocol: QC2.0, QC3.0, Apple, HuaWei, Samsung
  
• Size: 82mm x 33mm x 15mm
  

This is a USB meter with protocol trigger.



I got the meter in a cardboard box, with specification on the back.



It contained the meter and a instruction sheet in English and Chinese.



The user interface is fairly simple, short presses on the two button changes screen or steps a value up/down, longer presses will activate/cancel configuration.












Display and functions




The main screen with voltage, current and power. There is also data line voltage and load equivalent resistance.



Voltage and current with power, capacity and time.



Protocol analyzer, shown detected protocol, voltage on data lines.



Calculate resistance in a cable, this requires a constant load and a stable usb supply. Then the reference voltage can be stored with load and without cable, adding the cable when reference is stored will show the resistance in cable and connectors.



Protocol search and trigger, hold down button to activate.



Each supported protocol has a trigger screen.



After the trigger screens is the auto detect mode. This screen is remembered when power is removed.



The charting function is designed to show a full charge curve, the fastest update rate is once a minute. The curve is saved.



There are a couple of configuration screens, Voltage, current, time out, log rate, back light, factory reset.



Measurements

• USB-C output will not be triggered when this device is used.
  
• USB-C output cannot be triggered from another device.
  
• The usb meter uses about 9mA current with backlight on.
  
• The internal resistance is about 0.095ohm (This includes both connectors).
  
• Usb meter will remember measured values when power is removed.
  
• Backlight timeout can be adjusted in 20s, 40s, 60s, always
  
• Voltage display is within the rated 0.2% when no current is flowing.
  
• Current display is within the rated 0.2% up to 3A, but more like 1.5% at 5A
  
• Minimum current before display shows current is about 0.18A, but is first precise at around 0.2A
  
• Curve update is in minutes, i.e. the curve is more than an hour at fastest setting
  

The voltage display is very precise with no current flowing.



The current display is also very precise up to 3A, then the precision drops some.



M1: 36.7°C, HS1: 54.7°C



M1: 44.5°C, HS1: 57.2°C

The above IR photo was taken after 30minutes with 5A.
The current varies with temperature, I got 1% change after 30 minutes with 5A.



Tear down



It was easy to open with four screws. Notice the two buttons are not the same, this prevents assembly faults.




The meter is based around a microprocessor (MM32F031K6T Arm M0), with support from a EEPROM (U4: 24C08AN) and a OpAmp (U1; marked S06AC) to amplify voltage from current shut. The current is measured across a 0.012ohm (12mOhm) resistor. The MPU uses internal 12 bit ADC. The microprocessor uses internal clock oscillator in this circuit, this means the Ah and Wh will be less precise.
And what is the extremely small resistor that is between C13 & U1?



On this side is the voltage regulator (U3: XC6203A 3.3V). According to the markings on the circuit board there may be a serial port available (A check with an oscilloscope did not show any data).








Conclusion

A usb meter with protocol analysis and trigger. The chart can be rather useful with the slow time scale, it will show the full charge curve for a phone or tablet. The USB-C functions do not really work.
I like the used interface, it is fairly easy to use, but I do not like that it need about 0.2A before it will show something.


Notes

For these USB meters I used precise equipment (Keithley: DMM7510, 2280S, Keysight: 34470A).

How do I make the test

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Test/review of OLAF 5V 2A SUB Fast Charger JC-0060

December 1, 2018, 6:56 am

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OLAF 5V 2A SUB Fast Charger JC-0060



Official specifications:

• AC ADAPTER usb charger adapter
  
• Input: 100-240V~50/60Hz Max0.5A
  
• Output: 5.0V-2.0A iphone charger
  
• Type: Power Adapter
  
• Compatible Devices: Universal
  
• Special Functions : Portable,USB,Rapid Charging
  
• Color: Black&white
  

I got it from ebay dealer nctqkj2-2017



This cheap charger arrived in a plastic bag in a plastic envelope without any accessories.










Measurements

• Power consumption when idle is 0.11 watt
  
• USB outputs is coded with usb charger (DCP)
  
• Weight: 35.1g
  
• Size: 83 × 40 × 22.5mm
  

The charger can deliver slightly above 3A, that is a bit much for a 2A charger.



It delivers slightly less at 120VAC, but still way above specifications.



Running the charger with 2A total output worked, but the output voltage drops when the charger gets warm.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 65.0°C, M2: 46.9°C, HS1: 68.3°C
HS1 is probably a combination of the transformer and the rectifier diode.



M1: 60.7°C, HS1: 64.2°C



HS1: 76.2°C



M1: 58.8°C, HS1: 73.5°C
HS1 is probably the circuit board near the rectifier diode.



M1: 65.6°C, HS1: 70.0°C
The high temperature around the USB connector is probably from the rectifier diode.



At 0.5A the noise is 57mV rms and 397mVpp.



At 1A the noise is 93mV rms and 640mVpp.



At 2.5A the noise is 131mV rms and 971mVpp, this is on the high side.



Tear down



Some pressure on the enclosure with my vice and the bottom could be broken off.



At the input is a fusible resistor (FU) and a bridge rectifier, the switcher is (DK1203: 12Watt), opto coubler, a large rectifier diode and a zener diode (DW). The blue safety capacitor have some approval markings on it.
The zener diode is used instead of a 431 chip, but is not nearly as good, this also explains the output voltage drop when the charger gets warm.









There is no interesting parts on this side. One of the output tracks is a bit interesting in layout, it goes from the rectifier diode to the capacitor, then to the output terminal, this is obvious done to reduce the output ripple a bit.





Distance between mains and low volt side is slightly low at about 5.5mm

Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

This charger is half decent, it can deliver rated current (and more), but is rather noise. Safety is not perfect, but not directly dangerous either.



Notes

The charger was supplied by a reader for review.

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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Test/review of Proelio Universal USB Charger XKY-024

December 7, 2018, 7:24 am

≫ Next: Test/review of ESR USB-C PD 45W car charger ASCC54-P27W12+Q3

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Proelio Universal USB Charger XKY-024



Official specifications:

• Brand Name: Proelio
  
• Model Number: Universal USB Charger
  
• Support Quick Charge Technology: No
  
• USB Ports: 2
  
• Quality Certification: CE,RoHS,PCT,CCC
  
• Output Interface: USB
  
• Input: 100-240V/0.6A
  
• Output: 5V/2.1A
  
• Power Source: A.C. Source,USB
  
• Colors: White
  

I got it from aliexpress dealer POP Finger Holder Store



It was packed in a plastic bag inside the usual envelope.



There is a led behind the front of the charger.











Measurements

• Power consumption when idle is 0.12 watt
  
• Both USB output is as usb charger (DCP)
  
• The two outputs are in parallel.
  
• Weight: 37g
  
• Size: 86 × 36.5 × 36.5mm
  

Output can deliver about 2.3A before it drops.



It is the same for the other output.



And also when using both outputs.



But not at 120VAC, there it can only deliver 1.7A



Running 1 hour at 1.7A worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 59.9°C, M2: 52.9°C, HS1: 60.3°C
HS1 is the transformer.



M1: 63.3°C, HS1: 65.7°C



HS1: 51.1°C



HS1: 97.9°C
HS1 is the transformer.



HS1: 75.3°C
HS1 is the rectifier diode.



At 0.5A the noise is 146mV rms and 1094mVpp.



At 1A the noise is 252mV rms and 1297mVpp.



Tear down



Placing the charger in my vice and whacking one with my mallet did open it.



At the mains input is a glass fuse and a brudge rectifier, the switcher (RM6204) is on this side, together with the opto-coupler. There is a large rectifier diode near the usb connector. The “blue safety capacitor” is not a safety capacitor, but just a 1000V capacitor









On this side is the usual reference (Q1: 431).





The creepage distance is about 1.5mm, this is way to short.

Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

The high voltage test did not show safety problems, but there are due to too short distance and a unsafe capacitor. Performance varies with voltage and there is a lot of noise in the output.

Stay away from this charger.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Test/review of ESR USB-C PD 45W car charger ASCC54-P27W12+Q3

December 9, 2018, 8:05 am

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ESR USB-C PD 45W car charger ASCC54-P27W12+Q3



Official specifications:

• Type: Car Charger
  
• USB Ports: 2
  
• Input: 12-24V
  
• Output PD: 5V/3.0A, 9V/3.0A, 12V/2.25A
  
• Output USB: 5V/3.0A, 9V/2.0A, 12V/1.5A
  
• Total power: 45W
  

I got it from Aliexpress dealer: ESR Official Store



It arrived in a box with a few specification on one side.



The box included the charger and a instruction sheet.



There is a blue led between the two usb connectors, it will show when the charger is powered.









Measurements

• PD codes: 5V 3A, 9V 3A, 12V 2.25A
  
• PD outputs starts disabled.
  
• PD output is coded as Apple 2.4A, DCP
  
• QC support DCP, Apple 2.4A, QC3, Huwai-FCP, Samsung-AFC
  
• Minimum QC3 voltage is 3.68V
  
• Power consumption when idle is 8mA from 12V and 7mA from 24V
  

Power consumption when noting is connected to output depends on input voltage.



QC output



5V output with low input voltage, this looks good up to about 3.8A, this is slightly high for a 3A rated output.



9V output, the same 3.8A



12V output, again the same 3.8A, output is only rated for 1.5A. Output voltage is a bit low, because the input voltage is low and this charger do not have a boost converter.



12V output with high input voltage the output is maintained at 12V.




In these curves I sweep voltage from 24V and down with a output load of 2A, this one shows the input current with 5V output.



The 5V output is stable down to about 6.2V input.



9V output works below 9.3V input



12V output works down to about 12.3V input, the pulses around 10V is attempts to retrigger QC




At 5V 0.5A the noise is 3mV rms and 142mVpp



At 5V 1A the noise is 4mV rms and 152mVpp



At 5V 2.5A the noise is 4mV rms and 134mVpp



At 9V 0.9A the noise is 3mV rms and 156mVpp



At 12V 1.2A the noise is 6mV rms and 136mVpp.



PD output



USB-C PD with 5V output and high input voltage can deliver about 3.6A



9V is also about 3.6A



Even 12V looks to be about 3.6A



12V output with low input voltage, as expected the output voltage is a bit low.





It can maintain 5V output down below 7V input.



For 9V output it need 9.6V input.



For 12V it need 12.6V input.



At 5V 0.5A the noise is 6mV rms and 124mVpp



At 5V 1A the noise is 3mV rms and 76mVpp



At 5V 2.5A the noise is 5mV rms and 106mVpp



At 9V 0.9A the noise is 3mV rms and 37mVpp



At 12V 1.2A the noise is 10mV rms and 209Vpp



QC and PD full load test




Running at 2×3A output for one hour was not a problem.
The temperature photo below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 54.1°C, HS1: 74.6°C



M1: 57.0°C, HS1: 63.3°C



M1: 62.2°C, M2: 50.1°C, HS1: 75.0°C




Tear down



I could not get the lid of, instead I cut a bit around it.



On this side is two inductors, one for each output and a few capacitors. The spring has a wire in it to increase current caring capability.



Looking from an angle it can be seen there is a chip below each inductor, it is the switcher. The USB-A output is on a raiser and there is some parts below it.







The gray part is some heat transfer rubber.







Behind the USB-A QC output is the controller chip (U2: Marked FT4U2K). On the main circuit board below the USB-A output is the PD controller chip.


Being a 12V device there is no need to test with high voltages.



Conclusion

The USB-A output supports all the common fast charge schemes, including Quick Charge.
The PD output support a few fast charge schemes in addition to PD.
It can deliver up to 12V on both ports with a fairly low voltage drop and lots of current.

It is a good USB car charger.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger

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Test/review of Quick Charge 3.0 3 port charger AR-QC-03

December 15, 2018, 3:18 am

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Quick Charge 3.0 3 port charger AR-QC-03



Official specifications:

• Item Type: QC 3.0 Quick Charging Wall Charger Adapter Station
  
• Material: ABS+PC
  
• Color: Orange
  
• Plug Type: US Plug
  
• Interface: 3* USB
  
• Input: AC 100V-240V, 50/60Hz, 0.5A
  
• Output: 5V/3A, 9V/2A, 12V/1.5A
  
• QC3.0 Output: DC 5V/2.4A, 9V/1.8A, 9V-12V/1.5A
  

I got it from ebay dealer: to-the-better















Measurements

• Power consumption when idle is 0.2 watt
  
• Both USB output is usb charger (DCP)
  
• QC output is auto coding with Apple 2.4A, Samsung, DCP, QC3, Samsung-AFC, Huwai-FCP
  
• Minimum QC3 voltage is 4.3V
  
• The two outputs are in parallel.
  
• QC and 5V outputs are not directly connected.
  
• Weight: 48.3g
  
• Size: 67 × 45.1 × 27.2mm
  

Output current on the first output is slightly below 1A, this is not very good for a 2.1A rated output.



Second output is the same.



And when used in parallel it is again the same, i.e. about 1A total available for two 2.1A rated outputs.



At 120VAC the current is slightly lower.



The QC output can deliver 3A.



At 9V QC is about 1.8A



And at 12V it is 1.4A



I did the load test at 5V 0.9A and 12V 1.2A and it could handle that for 1 hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 61.8°C, HS1: 73.1°C
HS1 is way above the QC transformer, M1 is the metal piece inside the charger.



HS1: 83.0°C
HS1 is the circuit board near the 5V transformer.



M1: 82.3°C, HS1: 87.6°C
HS1 is below the QC transformer and M1 is below the 5V transformer.



M1: 82.1°C, HS1: 99.8°C
HS1 is the circuit board near the QC transformer (This is rather hot) and M1 is near the QC rectifier diode.



M1: 52.0°C, HS1: 69.1°C



At 0.5A the noise is 118mV rms and 726mVpp.



At 1A the noise is 135mV rms and 850mVpp.



At 5V 0.5A QC the noise is 90mV rms and 1470mVpp.



At 5V 2.5A QC the noise is 243mV rms and 1878mVpp.



At 12V 1.2A QC the noise is 115mV rms and 1807mVpp, this is a very high noise level at any current.



Tear down



This type of enclosure is often easy to open: Tie the bottom down in a vice and whack the top with a mallet, it worked fine here.



A metal piece inside the enclosure, it could have been for heat spreading, but it is above the circuit board and not touching anything. This means it is probably to make the charger heavier,



There is a fusible resistor at the mains input, one switcher IC (U1: DK112 18W switcher) with opto feedback (U2), there is a rectifier diode (D2) on the low volt side, this uses the large transformer and is for the QC output. The 5V output uses the small transformer and a smaller diode (D5).
Between the two transformers is also the “safety capacitor” (CY1) that is a 1kV non safety type.







On this side is the bridge rectifier (B1) and the switcher (U1: Marked DP3773) for the 5V output. On the QC side is the QC controller (U3: Marked FT4kFA) and a reference (Q1: 431).





The isolation distance with a slot in the circuit board is minimum 4mm, here it is about 3mm and the same without a slot.

Testing with 2830 volt and 4242 volt failed the 4242V test, this means it is unsafe in 230V countries.



Conclusion

Performance of this charger is fairly bad, the 5V can only deliver 1A and both 5V and QC has a lot of noise.
Safety is even worse: It do not use a safety capacitor and isolation distance is way too low. I do not like that the enclosure is nearly 100°C on the outside.



Notes

The charger was supplied by a reader for review.

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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Test/review of DTU-1705 USB Tester

December 17, 2018, 6:05 am

≫ Next: Test/review of Tronsmart Titan plus 5 port QC charger U5TF

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DTU-1705 USB Tester



Official specifications:

• Input voltage: DC 4 – 30V
  
• Input current: DC 0 – 5A
  
• Voltage resolution: 0.0001V
  
• Current resolution: 0.0001A
  
• Voltage accuracy: 0.1% + 2
  
• Current accuracy: 0.1% + 2
  
• Power consumption: 7-11mA
  
• Internal resistance: 55 – 65mOhm
  
• Capacity counter: 0 – 9999.9Ah (Resolution: 0.0001Ah)
  
• Power counter: 0 – 9999.9Wh (Resolution: 0.0001Wh)
  
• Timer range: 0 – 999mins
  
• Interface: USB-A, TYPE-C, Micro USB
  
• Logger capacity: 100 group
  
• Log rate: 0 – 60min
  
• Protocol: QC2.0, QC3.0, Apple, HuaWei, Samsung
  
• Size: 82mm x 33mm x 15mm
  

This is a high resolution USB meter.



I got the meter in a cardboard box, with specification on the back. It contained the meter and a instruction sheet in English and
Chinese.



The user interface is fairly simple, short presses on the two button changes screen or steps a value up/down, longer presses will activate/cancel configuration.











Display and functions




The main screen with voltage, current and power. There is also the output status because this tester can turn off output on under voltage, over voltage, under current, over current and time.



Voltage and current with power, capacity and time.



Protocol analyzer, shown detected protocol, voltage on data lines and load equivalent resistance.



Calculate resistance in a cable, this requires a constant load and a stable usb supply. Then the reference voltage can be stored with load and without cable, adding the cable when reference is stored will show the resistance in cable and connectors.



The charting function is designed to show a full charge curve, the fastest update rate is once a minute. The curve is saved.



There are a couple of configuration screens, Voltage, current, time out, log rate, back light, factory reset.



Measurements

• USB-C output will not be triggered when this device is used.
  
• USB-C output cannot be triggered from another device.
  
• The usb meter uses about 11mA current with backlight on.
  
• The internal resistance is about 0.110 ohm (This includes both connectors).
  
• Usb meter will remember measured values when power is removed.
  
• Backlight timeout can be adjusted in 20s, 40s, 60s, always
  
• Voltage display is easily within the rated 0.1% when no current is flowing.
  
• Current display is within the rated 0.1% up to 3A, but more like 0.5% at 5A
  
• Curve update is in minutes, i.e. the curve is more than an hour at fastest setting
  

The voltage display is very precise with no current flowing, but there is on digit too much for the precision.



The current display is also very precise up to 3A, then the precision drops a bit.



M1: 43.5°C, HS1: 71.6°C



M1: 46.9°C, HS1: 67.0°C

The above IR photo was taken after 30minutes with 5A.
The current varies with temperature, I got 0.34% change after 30 minutes with 5A.



Tear down



It was easy to open with four screws. Notice the two buttons are not the same, this prevents assembly faults.



The meter is based around a microprocessor (MM32F031K6T Arm M0), with support from a EEPROM (U4: 24C08AN), a ADC for voltage (U1: CS1237 24 bit) and a ADC for current (U6: marked CAUS). The current is measured across a 0.012ohm (12mOhm) resistor.



On this side is the voltage regulator (U3: XC6203A 3.3V) and the transistor used to connected/disconnect the usb output (U2)









Conclusion

A precise usb meter with some extra functions like cable resistance, protocol analysis and disconnect. The chart can be rather useful with the slow time scale, it will show the full charge curve for a phone or tablet. The USB-C functions do not really work.
I like the used interface, it is fairly easy to use.



Notes

For these USB meters I used precise equipment (Keithley: DMM7510, 2280S, Keysight: 34470A).

How do I make the test

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My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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Test/review of Tronsmart Titan plus 5 port QC charger U5TF

December 21, 2018, 6:30 am

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Tronsmart Titan plus 5 port QC charger U5TF



Official specifications:

• Model: U5TF
  
• Technology: Qualcomm Quick Charge 3.0 & VoltiQ & Huawei FCP
  
• Input: AC 100-240V, 50-60HZ, 2.4A (Max)
  
• Output: Max 5-6.5V/3A, 6.5-9V/2A, 9-12V/1.5A; 5V/2.4A
  
• Total Power: 90W
  
• Material: PC
  
• Size: 159*81*29 mm
  
• Weight: 300g
  
• Certifications CE, FCC, RoHS
  

I got it from ebay dealer: thetoptens



The charger arrived in a cardboard box.



The box contained the charger, a mains cable, a instruction sheet and the warranty card.













Measurements

• Power consumption when idle is 0.2 Watt
  
• All USB outputs are auto coding with Apple 2.4A, Samsung, DCP, QC3, Samsung-AFC, Huawei-FCP
  
• Minimum QC3 voltage is 4.3V
  
• Weight: 295g
  
• Size: 159 × 81 × 30.2mm
  

At 230VAC the overload protection kicks in at 3.5A on all outputs.











At 120VAC the current is slightly higher.



At 9V the overload protection is at 2.6A



And at 12V the overload protection is at 2A



Again 120VAC means slightly higher current.



Running all outputs in parallel (Each with its own load) at 5V the maximum current is 17A



At 12V the maximum current is nearly 10A.



Power factor (PF) is relevant at higher power, this power supply has not compensated it to about 1.



The charger had no problem running one hour with 5*3A -> 15A total output.



The charger could also handle 12V 1.5A*5, but the output voltage did increase a bit when the charger got warm.
Voltage is calculated as an average for all 5 outputs in both tests.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 61.0°C, HS1: 68.1°C
5V 3A output. All the heat patches on the top are the transformers.



M1: 42.2°C, HS1: 60.9°C
5V 3A output.



M1: 70.3°C, HS1: 70.7°C
5V 3A output, here the heat is from the synchronous rectifiers and the transformers.



M1: 55.5°C, HS1: 61.0°C
12V 1.5A output, the temperature of the transformers are about the same at this current as with 5V 3A.



HS1: 69.3°C
12V 1.5A output, but the rectifier do adds as much heat, here it is mainly the transformers.



At 0.5A the noise is 12mV rms and 74mVpp.



At 1A the noise is 44mV rms and 218mVpp.



At 2.5A the noise is 31mV rms and 234mVpp.




At 9V 0.9A the noise is 15mV rms and 113mVpp.



At 12V 1.2A the noise is 20mV rms and 232mVpp, all noise looks fairly low




Tear down



There was no obvious seams on the enclosure and I decided to cut the front off, but the lid was the bottom.
The power switch is mounted from the outside and soldered to the circuit board when it is mounted.



The circuit is five separate QC chargers, the only common parts is the mains switch and the inrush current limiter (NTC1). Part numbers add a letter depending what output then are for (A-E).
Each input has its own fuse (F1) followed by a common mode coil (LF1). There are two smoothing capacitors (EC1 & EC2?) with a inductor (L1) between. The mains switcher transistor (Q1: A4N65H 650V 4A) is a fully isolated TO220 package.
Next to the transformer is a safety capacitor (Y1). The power LED is on output E.



I wondered about the size of the safety cap, a common used value is 2.2nF, here it is 5 pieces of 1nF, because you will only touch one one output at a time the leakage current is small.









On this side is the bridge rectifier (BD1), the switcher controller (U1: Marked 73S7L). Being QC a optocoupler is needed (U2: EL357N 3750V isolation). On the low volt side is the synchronous rectifier (U4: LP20R100), the QC controller (U5: FT4) and the usual reference (U3: CYT431A)





There is no problem with isolating distance, it is more than enough.

Testing with 2830 volt and 4242 volt between mains and low volt side (I did it on each output), did not show any safety problems.



Conclusion

The is five high quality QC charger in one enclosure, then are auto coding with support for many protocols, low noise and can deliver a lot of current, but with individual overload protection. Efficiency is good. I did not see any safety issues.




Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Test/review of Roidmi Smart Car Charger 3S BFQ04RM

December 23, 2018, 8:03 am

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Roidmi Smart Car Charger 3S BFQ04RM



Official specifications:

• Brand: ROIDMI
  
• Model: 3S
  
• Color: Black
  
• Input (Car Charger): 12 – 24V
  
• Output (Car Charger): 5V 2.4A ( Max. 3.4A ) / 5V 2.4A ( Max. 3.4A )
  
• Apply To Car Brand: Universal
  
• Working Temp.: 10 – 60 Deg.C
  
• Material (Cable & Adapter): Stainless Steel
  
• FM frequency: 87.5 – 108.0MHz
  
• Bluetooth profile: Dual mode V4.2 (BR/EDR)
  
• Bluetooth protocol: HFP/A2DP/AVRCP/EDR/SPP/BLE
  

I got it from gearbest.com



It arrived in a white box with specifications on the back.



In the box was the charger and a instruction sheet.




When I unpacked it there was a label telling about the control application. Below it was the two usb connectors and a very discrete 5V 2.4A marking.





The markings on the charger is also very discrete being black print on a black charger.





Measurements

• Usb ports are coded with Apple 2.4A, Samsung, DCP, QC 5V
  
• Power consumption when idle is 60mA from 12V and 45mA from 24V
  
• There is a cyan led behind the usb connectors, it will flash when on and be steady when Bluetooth is connected.
  
• The led probably has other colors, the tear down showed a RGB led controller chip.
  
• Weight: 31.2g
  
• Length: 61mm
  
• Front: Ø26.3mm
  

Overload protection is slightly above 2.5A, this is very good for a 2.4A charger.





Voltage do not really change output voltage or overload protection.



The second output has the same limit.



But when used together the output is much higher and well above the rated 3.4A





The charger works down to about 7V



The idle current is fairly high due to Bluetooth and FM transmitter.



There was no problem running 1 hour with 3.4A load.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 44.7°C, HS1: 66.8°C



M1: 48.0°C, HS1: 68.0°C



At 0.5A the noise is 3mV rms and 50mVpp.



At 1A the noise is 3mV rms and 52mVpp.



At 2.5A the noise is 6mV rms and 67mVpp.



At 3.3A the noise is 3mV rms and 55mVpp, all very very low values.



Bluetooth & FM



The FM radio is at selected frequency.



And white noise shows a horizontal level as it is supposed to do.



Roidmi has more than one Bluetooth product and they all share the same application, here I selected “Music Bluetooth Car Charger” and got a couple of simple setup screens. The application did require a lot of access to the phone: Phone, location, pictures, etc.
This application is not required to use the charger, the charger will connect to the phone and play music on 96.4MHz without it. The application is required to change FM frequency or read the battery voltage.



This is the default screen for the charger.



The frequency select looks similar to the initial frequency select.



The voltage display will give an alarm when battery voltage is out of tolerances. It is fairly precise, 12V is shown as 11.997V and 24V is shown as 23.94V. It cannot measure all voltage, but only the valid range for 12V and 24V batteries.



It also includes an explanation of the different voltage ranges for a car.



The about information is missing. This screen was selected on the welcome screen.



Tear down



I could not get it open and used some dramatic cutting to do it.



When I got it open I could see it was assembled from the front with two small screws to hold the electronic in place. The screws is first accessible when the front is removed.





The construction is two layer, one is radio, the other power supply. The front do also have some parts.









Some soldering and the two layers was apart.



This circuit board is the switcher with a switcher controller, a power mos and two current sense resistors (R040: 40mOhm), one for each output. At the input is a fuse (Green part with a T) and about 80uF in five ceramic capacitors.



The other side is the inductor and a smoothing capacitor for the usb output voltage.
This board has 3 connections to the usb connectors: common 0V and a 5V for each output.











This circuit board has a FM transmitter (QN8027), some flash memory (BoyaMicro) and a processor with build in bluetooth, the bluetooth antenna is marked WTC.



On this side is a 3.6V voltage regulator (Marked 65KH). The connector to the front is marked GND, RGB, MIC and 5V. The 3 of them is obvious, but what about MIC, is there a microphone in the front?











The damaged chip was from trying to pry the circuit board out, it is a 3 channel (i.e. RGB) serial controlled LED controller. The other chip must be a auto coding chip.



Here is the RGB led, below the usb connector. There is no microphone.





The FM antenna is a coil placed around the USB connector.


Being a 12V device there is no need to test with high voltages.



Conclusion

The charger has two output, each with a good overload protection, very low noise and auto coding. In addition to this it is also a FM transmitter that can link to a phone with Bluetooth and transmit music to the car radio (This is most useful in older cars).

This is a very good car charger, but it cannot fast charge two power hungry device simultaneous.



Notes

There also exist a version with microphone, this is used for a hand-free function with the phone.

Index of all tested USB power supplies/chargers with DC input
Read more about how I test USB power supplies/charger

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Test/review of Tutuo USB Smart Charger QC-025PT

December 29, 2018, 8:21 am

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Tutuo USB Smart Charger QC-025PT



Official specifications:

• Brand: TUTUO
  
• Type: Base Dock Charger
  
• Features: ALL-in-1
  
• Material (Cable & Adapter): ABS
  
• Color: Black,White
  
• Input: 100 – 240V, 50 / 60Hz, 1A
  
• Output: 3.6 – 6.5V 3A, 6.5 – 9V 2A, 9 – 12V 1.5A, 5V 2.4A ( smart output ), 5V 3A ( Type-C )
  

I got it from gearbest




I got it in a brown cardboard box, with only the brand name and a barcode on it.



The box contained the charger, mains cable, a usb cable and instruction sheet.







Beside the “3.0” label on top is a blue and red led, The blue part is connected to 5V and the red part is connected to QC and will show some red at 9V and more at 12V.





Measurements

• Power consumption when idle is 0.11 watt
  
• USB output is auto coded with up to Apple 2.4A, Samsung, DCP
  
• The 3 USB outputs are in parallel
  
• QC output is auto coding with Apple 2.4A, Samsung, DCP and QC3
  
• USB C output is fixed at 5V using resistor coding.
  
• USB-C output is always on.
  
• Weight: 183g
  
• Size: 83 × 83 × 32mm
  

No obvious current limit on this port.



Using all ports in parallel I can draw 10A and without individual port protection this is also what can be drawn from a single port.



And about the same at 120VAC



The QC output has a current limit at 3.7A at 5V



At 9V it drops at 2.7A



At 12V it is down to 1.8A, this is well above the rated 1.5A



The usb-c output can deliver 3.8A



Running the charger with 2.4A on usb, 3A on usb-c and 1.5A on QC 12V worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 54.7°C, M2: 55.7°C, HS1: 62.0°C
HS1 is the transformer and M2 is part of the rectifier heatsink.



M1: 51.4°C, HS1: 54.3°C



M1: 56.7°C, M2: 56.5°C, HS1: 57.7°C
M2 is the transformer and M1 is the rectifier heatsink.



M1: 46.5°C, HS1: 50.8°C



M1: 61.7°C, HS1: 65.5°C



At 0.5A the noise is 10mV rms and 268mVpp.



At 1A the noise is 10mV rms and 257mVpp.



At 2.5A the noise is 10mV rms and 238mVpp.



At 5A the noise is 10mV rms and 172mVpp.



At 0.5A the noise is 14mV rms and 275mVpp.



At 2.5A the noise is 6mV rms and 86mVpp.



At 0.5A the noise is 6mV rms and 170mVpp.



At 2.5A the noise is 14mV rms and 266mVpp.



At 0.9A the noise is 11mV rms and 271mVpp.



At 1.2A the noise is 9mV rms and 303mVpp.


Tear down



I could pry the lid of with a screwdriver, the circuit board was mounted with two screws (There was space for four).



At the mains input is a fuse and a common mode coil, the mains switcher transistor is mounted on a heatsink. On each side of the the transformer there is a safety capacitor (Only one is visible).
On the low volt side is a heatsink with a diode for QC and a rectifier transistor for 5V (Both QC and USB), there is also opto feedback from the 5V rail.
The QC circuit has a inductor (L2) and a buck controller (U8?) with a rectifier diode (D5), the QC protocol is handled by a small 8 pin IC (U14?). The Power supply for QC is 5V + 9V from an extra winding on the transformer.
Next to the usb-c connector is a led in a shrink wrap tube.



The usb-c connector has its own circuit board with a chip on it (U6: UC2501), not to implement the PD protocol, but to make it auto coding for old-style usb power and provide over current limit.







This side has a lot more chips on it and the mains bridge rectifier (BR1), the mains switcher is U1. It looks like R5 was supposed to be two resistors on top of each other, but the topmost one got loose due to heat (May have been during my test). The two black pieces are to improve mains isolation.
On the low volt side is a synchronous rectifier chip (U12) that controls the transistor on the heatsink, the voltage reference (U7: 431). Each of the regular usb connectors has a auto code chip (U2, U3, U5), there is also a regular fuse for each usb output (F4, F5, F6).
A Zener diode (D7: around 6.3V) and resistor (R76) is used for the red led.





The distance between mains and low voltage is fine.


Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

The charger can deliver a lot of power and has output for the most common standards: USB, QC, USB-C.
The USB-C is not a PD with multiple voltage and electronic reporting, but just 5V. All ports has auto coding for the usual usb protocols. All ports shares a common power source and there is not enough to run all ports at there rated current, even though there is a lot of power. The noise is on the low side.
I do not like the fuses, the will protect against damaged usb cables, but it means that the usb port is permanently dead. The misplaced resistor is also very bad, I did run the charger a bit hard, but I would not expect parts to come loose.

I will rate is as fairly good.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Test/review of YZXStudio USB meter ZY1278

January 2, 2019, 8:10 am

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YZXStudio USB meter ZY1278



Official specifications:

• Item: ZY1278
  
• Size: 41*17*8
  
• Display: 0.96 inch TFT
  
• Resolution: 160*80
  
• Communication: USB3.1Gen2
  
• Input port: C male
  
• Output port: C female
  
• Fast charge trigger: No
  
• PD straight through: YES
  
• Fast charge straight through: All models support the normal fast charge protocol through the meter
  
• VOOCDASH: Only DASH
  
• Upgrade method: ST-LINK upgrade
  
• Voltage accuracy: 0.1%±2d
  
• Current accuracy: 0.1%±2d
  
• Internal resistance is less than: 50mOhm
  
• Open screen power consumption: 17mA
  
• Off screen power consumption: 2mA
  

YZXStudio makes a series of usb meters, some of them very advanced.



I got the meter in a small metal can





Maximum specifications and connector information is listed on the back.



The button is on this side.








Display and functions



The screen with most information about current and voltage. The arrow shows current direction. Hold button down to select number of digits.



Next screen Wh, Ah and time.
Hold down the button to select group from 0 to 5, they are used to save the recorded values.



Next screen is the fast charge screen, it shows the voltage on the data and CC wires and tries to guess the protocol. If multiple protocols match the voltage, it will show multiple protocol names.
Hold button down to enter configuration.



Next screen is cable resistance measurement, it requires a constant current load and a fairly stable usb supply. First connect the usb meter directly to the power supply and hold down the button, then connect using the cable and the display will show cable and connection resistance.



Next screen is curves. It can either show voltage and current or the data lines, hold down the button to switch between them.
The curves will auto scale, this means they are fairly sensitive for even small variations.



Next screen is a simple screen with voltage, current and power, it uses a very fast update speed.
Hold down the button to change number of digits and flip the screen, the orientation will be used for all screens.

The last screen is “screen off”, then the sequence starts from the first screen again.





Some examples on protocols, it do not identify the used PD coding.




The different configuration options.



Measurements

• USB-C output will not be enabled by this tester, the connected device must do that.
  
• The usb meter uses about 17mA current with normal brightness (10), 2 with display off.
  
• The internal resistance is about 0.12ohm (This includes both connectors).
  
• Usb meter will remember measured values when power is removed.
  
• There are 6 groups: 0 – 5
  
• This meter can show current in either direction.
  
• Backlight timeout can be adjusted in 1 minute steps up to 10 minutes, then in 5 minutes steps up above 4 hours or turned off.
  
• Curve update can be 0.1s/div, 0.2s/div, 0.5s/div, 1s/div, 3.6s/div, 5s/div, 10s/div, 20s/div
  
• Voltage display is within 0.1% when no current is flowing.
  
• Current display is within 0.3% high current has the largest tolerance.
  
• Software in tester is V3.36E
  

The voltage display is very precise with no current flowing, but there is too many digits.



The current display is also very precise and will not change with voltage and again there is too many digits.



M1: 72.0°C, HS1: 94.2°C



M1: 83.0°C, HS1: 96.2°C

The above IR photo was taken after 30minutes with 5A, the internal temperature is reported as 67°C
During that time the voltage readouts changed 0.6% and current 0.1%



Tear down



I had to remove 8 screws to open it, four for the back and four for the front.
The front and back have white graphic on the inside.



All the electronic are here, the processor (STMF030F4P6: ARM Cortex M0, 16kB flash, 4kB ram, 12 bit ADC), it do not have enough ADC resolution for this tester, this means there is an external ADC (Marked 7A TI / 226) and measure across a 0.012ohm resistor. The data is saved in a EEPROM (Marked RC16 / E11750 / 3XV). For powering this circuit there is a voltage regulator (SE8533: 3.3V).









There is nothing behind the display.





Conclusion

This is a high resolution usb meter for USB-C. It is nice it shows the CC voltage, but I am missing an interpretation of them. The resolution is a bit too much, one digit less would be fine.
I like it has both a USB-C male and female connector, this makes it easy to use without needing extra cables, that will add more resistance.



Notes

For these USB meters I used precise equipment (Keithley: DMM7510, 2280S, Keysight: 34470A).

How do I make the test

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My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Test/review of Olaf Dual Car charge with display 2.1A

January 6, 2019, 9:52 am

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Olaf Dual Car charge with display 2.1A



Official specifications:

• Input: 5V/2A      A car is 12V or 24V, not 5V. On of the slides correctly shows: DC 12-24V
  
• Quality Certification: CE,CCC
  
• Output Interface: USB
  
• Power Source: A.C. Source      A car is DC, not AC
  
• Support Quick Charge Technology: No
  
• USB Ports: 2
  
• Model Number: USB Charger,USB Adapter,Phone Charger
  
• Output: 5V/2.1A
  

I got it from Aliexpress dealer: TwitchDirect Store



No fancy box for this charge, just an envelope and a plastic bag.













The display will change between 3 values: Input voltage, output voltage and output current.



Measurements

• Usb output is coded as usb charger (DCP).
  
• The two usb outputs are in parallel.
  
• Power consumption when idle is 18mA from 12V and 13mA from 24V
  
• Display will flash at 10.7 volt or lower input voltage.
  
• Display turns off at about 6.8 volt
  
• Weight: 20.7g
  
• Length: 64.5mm
  
• Front: 35.2 × 25.2mm
  

Both voltmeter and current meter have a good precision.



The charger has a over current protection a bit about 2.3A, this is fine for a 2.1A rated charger.



The over current limit is the same on both outputs



Because they are in parallel and the maximum output current is about 2.3A



At 24V the over current protection do not looks as good, it trips at the same current but do not drop the voltage as fast.



The unloaded current drops a bit up and down, due to the display changing between the different values.





Even at 2A load the output can be maintained down to 7V



There was no problem running 1 hour with full load.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 43.1°C, HS1: 53.8°C



M1: 55.3°C, HS1: 57.2°C



At 0.5A the noise is 11mV rms and 161mVpp



At 1A the noise is 11mV rms and 142mVpp



At 2A the noise is 25mV rms and 175mVpp



Tear down



I could break the lid of the charger, the display and usb connectors was then loose and could be pulled out, to get the switcher board I had to press on the sides and use a pin to push from the bottom.



There is space for a fuse at the 12V input, but it is just a 0.05ohm resistor. There is 3 wires to the display board: 0V, 5V and Input (For voltmeter)



Below the inductor is switcher (U1: DP3115 2.5A synchronous buck switcher).



This side do not contain any parts.













On this side is the display and the two usb connectors, below the display is a few resistors and capacitor. Two of the resistors are probably a voltage divider for input voltage.



This side has the display controller (U3) and a current shunt (R10 & R14: 30mOhm & 500mOhm) to measure the output current.
The display mist have a build-in chip, with only 6 pins it is not possible to control it directly.




Being a 12V device there is no need to test with high voltages.



Conclusion

I am not impressed with the specification on the dealer site, but the charger works fine, has a good coding, is overload protected at a good level and the display is nice. Only problem is that the current is fine for one usb connector it is way to low for two connectors.

I will rate it as fairly good.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger

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Test/review of Yojock USC-C PD 60W charger S-TR-140

January 12, 2019, 7:03 am

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Yojock USC-C PD 60W charger S-TR-140



Official specifications:

• Original Yojock USB-C Charger
  
• 60W Max Smart Output
  
• 5V=3A/9V=3A/12V=3A/15V=3A/20V=2.25A
  
• Type-C Port
  
• USB PD 2.0 Quick Charge
  
• Dimension: 62(L) x 62(W) x 32(H) mm
  

I got it from aliexpress dealer: YOJOCK Official Store




I got the charger in a cardboard box with a model specification.



The charger included the charger, one mains plug and a instruction sheet.



The mains plug is a separate item, without this the charger has a foldable US plug.

















Measurements

• Power consumption when idle is 0.09 watt
  
• PD output supports: 5V 3A, 9V 3A, 12V 3A, 15V 3A, 20V 3A
  
• PD output supports DCP, QC3 and Apple 2.1A
  
• Default output is off.
  
• Weight: 152g
  
• Size: 105 × 62 × 31.8 mm
  

The charger can deliver about 3.6A on 5V with good efficiency.



At 9V it is the same



And at 12V



At 15V it still maintains around 3.7A



Even at 20V



Dropping the mains voltage to 120VAC do not affect output current.



Here I did a one hour run at 20V 3A, this worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



HS1: 85.8°C



M1: 65.7°C, M2: 63.6°C, HS1: 66.2°C



HS1: 79.7°C



M1: 43.6°C, HS1: 47.9°C



HS1: 84.6°C



At 5V 0.5A the noise is 33mV rms and 1412mVpp.



At 5V 1A the noise is 89mV rms and 1368mVpp.



At 5V 2.5A the noise is 45mV rms and 1341mVpp.



At 12V 1.2A the noise is 42mV rms and 1447mVpp.



At 20V 2A the noise is 49mV rms and 1174mVpp.



Tear down



It could not squeeze, break or whack this charger open, I had to cut it.



It looks fairly filled this side of the circuit board. At the input is a fuse (FR1) and two common mode coils (LF1 & LF2), followed by the bridge rectifier (BD1) with a safety capacitor next to it (CY2), there is also a safety capacitor (CY1) next to the transformer. The mains switcher transistor (Q1) is mounted on the heatsink. On the low volt side is a rectifier transistor for synchronous rectification, it do not need a heatsink.







A side view of the usb connector board, it has the PD chip (U6: Marked WT661SF) on it.



On this side is the mains switcher (U1) and a synchronous rectification controller (U2). There is also opto feedback (U5)





Because the slot below the opto coupler is too short, the distance between mains and low volt side is slightly low.


The charger passed the 2830 volt and 4242 volt test, this means it is it is fairly safe.



Conclusion

This charger delivers the rated 60W to the USB-C connector, but only at 20V. The output supports both PD and the most common older protocols. Generally the design longs fine, but there is a lot of noise.




Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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Test/review of Tanggood USB Type C Charger 25W PD 3.0 APSPD025WE-G

January 18, 2019, 7:31 am

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Tanggood USB Type C Charger 25W PD 3.0 APSPD025WE-G



Official specifications:

• 25W powerful PD 3.0 and compatible with quick charge 3.0
  
• 5V-3A, 9V-2.67A, 15V-1.6A, 20V-1.25A, supports 4 voltage and detect connected device to its fastest speed
  
• Compatible with 100-240V worldwide voltage
  

I got it from aliexpress dealer: TG Direct Store



I got the charger in a cardboard box with a photo of a two port charger and a label with specifications for this charger.



The box included the charger and a instruction sheet.










Measurements

• Power consumption when idle is 0.07 watt
  
• PD output supports: 5V 3A, 9V 3A, 12V 2.5A, 15V 2A, 20V 1.5A
  
• Output do not support any old coding.
  
• Default output is off.
  
• Weight: 65.8g
  
• Size: 88.3 × 45 × 28mm
  

The 3A rated 5V output can deliver 3.5A, this is fine.



At 9V the rating is 2.67A printed on the charger and the electronic rating is 3A, the charger can deliver 3.5A



The 12V rating is 2.5A and the charger delivers about 2.9A.



At 15V the rating 1.6A printed on the charger and 2A on the electronic rating, the charger delivers 2.3A



At 20V the printed rating is 1.25A and the electronic rating is 1.5A, the charger delivers about 1.9A



The output is the same at 120VAC



For a load test I used 15V 2A load for one hour, it worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



HS1: 81.6°C
This large warm area is the transformer.



M1: 61.9°C, HS1: 64.4°C
HS1 is from the main IC transferred through the circuit board.



M1: 67.8°C, HS1: 97.0°C
HS1 is the main IC with the heat pad, it gets rather hot.



M1: 68.4°C, M2: 70.7°C, HS1: 75.7°C



M1: 57.3°C, HS1: 80.6°C
HS1 is the synchronous rectifier transistor (Q1).



At 5V 0.5A the noise is 23mV rms and 314mVpp.



At 5V 1A the noise is 24mV rms and 257mVpp.



At 5V 2.5A the noise is 42mV rms and 289mVpp.



At 12V 1.2A the noise is 27mV rms and 321mVpp.



At 20V 2A the noise is 48mV rms and 520mVpp.



Tear down



This type of enclosure is often easy to open: Tie the bottom down in a vice and whack the top with a mallet, it worked fine here.



At the mains input is a fuse (F1) and a inrush current limiter (THR1) mostly hidden in the white stuff. The is also a common mode coil and a inductor between the two mains smoothing capacitors.
As usual there is a blue safety capacitor (CY1) between mains and low volt side.







The USB-C connector is on a small circuit board with a few TVS diodes on (This is a very nice input protection).



The main chip has a heat transfer pad on it to give better heat connection to the enclosure.



At the input is the bridge rectifier (BD1), most of the mains switching is handled in one chip (U2: INN2215K rated 20W-25W) it needs a power mos on the output side (Q1) for synchronous rectification and a resistor for measuring current (R21A: 0.005ohm). The PD function is handled by another IC (U4: WT6632F S30, this is a 30W version) that also needs a power mos (Q5).
The WT6632F is also supposed to support QC, but my testers could not detect it.





The distance between mains and low volt side is good.


The charger passed the 2830 volt and 4242 volt test, this means it is it is fairly safe.




Conclusion

This is a straight forward design for a PD charger, but somebody has not read the datasheets, the output power is too high for the switcher, that is the reason for the very high temperature. The noise and temperature is a bit high and I would have liked the old protocols to be available. The mismatch between the printed ratings and the electronic ratings is not good, any connected PD equipment will use the electronic rating.

A bit more care in the design and it would have been a good charger.


Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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Test/review of Cabletime Dual QC car charger QK505

January 20, 2019, 7:23 am

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Cabletime Dual QC car charger QK505



Official specifications:

• Input: 12-24V/3.5A MAX
  
• Output QK2: 5V/2.4A
  
• Output Smart7: 4-12V/3.6A MAX;
  
• Protocols: Huwwei FCP/SCP, QC2.0/QC3.0, AFC/SFCP
  

I got it from Aliexpress dealer: Lancom cable Store



I got it in a small cardboard box inside a plastic bag.



The box contained the charger and a note.











Measurements

• QK2 usb output support Apple 1A, Samsung, DCP
  
• Smart7 output support Apple 2.4A, Samsung, DCP, QC3, Samsung-AFC, Huawei-FCP, Huawei-SCP
  
• Current consumption when idle is 14mA
  
• There is led behind the usb connectors and a translucent ring on the charger.
  
• Weight: 34.1g
  
• Length: 64mm
  
• Diameter: 32mm
  

This output is rated for 2.4A output current, but delivers significantly more at 3.4A.



With 24V input the output current is slightly smaller.



The QC output can deliver 3.8A, this matches the 3.6A rating.



At 9V it can “only” deliver about 3A, before output voltage drops.



And at 12V it is limited to 2.2A, this is more than enough for a QC output.



Using 24V input reduced the maximum output current to 1.8A for 12V.




With 2A load current it can maintain 12V output down to about 13V and will drop out of QC mode at 11V.




With 2A load current it can maintain 5V down to 5V.



Idle current consumption varies a bit with voltage, but not much.



For load test I uses 12V 1.4A and 5V 2.4A, the charger had no problem running one hour with that.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 54.4°C, HS1: 55.4°C
Being a all metal body (except front) the temperature is nearly the same all over the charger, it gives a nice cooling for it.



M1: 51.2°C, HS1: 55.5°C




Noise at 0.5A output is 15mV rms and 104mVpp



Noise at 1A output is 17mV rms and 110mVpp



Noise at 2.5A output is 20mV rms and 116mVpp



Noise at 0.5A on the QC output is 24mV rms and 157mVpp



Noise at 2.5A on the QC output is 31mV rms and 161mVpp



Noise at 1.2A on the QC output is 23mV rms and 142mVpp, all low noise values.






Tear down



No cutting or breaking this time, I could screw the tail off and the push the circuit board out the front.



There is a white heat transfer piece on top of one of the IC’s.



At the input is a green fuse (F1). Next is the 5V switcher (LINTOP LT6005C), followed by the QC switcher and controller (Injoinic IP6505).





On the other side of the circuit board are inductors for the two switchers and some capacitors.









The last picture shows that both power and data connections from the QC usb is connected to the switcher circuit board.



The four leds for the white light are here, the auto coding chip for the normal usb bort is also here (U3: Marked 2515)


Being a 12V device there is no need to test with high voltages.



Conclusion

The charger has one connector with support for many protocols including QC and one more simple connector, it has power enough to run both at full current, they are overload protection and with low noise. The metal body construction improves cooling.

I will call it a good charger.


Notes

Read more about how I test USB power supplies/charger

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Test/review of 6 Generation Portable 5V2A Double Ports A1444

January 26, 2019, 1:21 am

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6 Generation Portable 5V2A Double Ports A1444



Official specifications:

• Size: 5.5 × 3.5 × 2.5cm/2.17 × 1.38 × 0.98”
  
• Weight: 30.9g
  
• Power: 5V 2A
  

I got it from ebay dealer: bellamout04



It arrived in a envelope and it included a mains pin adapter, but this type of adapter will not fit a European socket.












Measurements

• Power consumption when idle is 0.2 watt
  
• One USB output is coded as Apple 2.1A
  
• Other USB output is coded as USB charger (DCP)
  
• The two USB outputs are in parallel.
  
• Weight: 28.2g
  
• Size: 52 × 36.6 × 24.6mm
  

The charger can deliver about 2.2A on one port, this is fine for a 2A charger.



And the same on the other.



And the same when the ports are working together.



At 230VAC the current is “only” 2.1A.



For a load test I used 15V 2A load for one hour, it worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 56.2°C, HS1: 69.1°C
HS1 is the transformer.



M1: 55.2°C, HS1: 60.6°C



HS1: 87.8°C



M1: 60.8°C, HS1: 63.4°C



M1: 64.6°C, HS1: 68.7°C
M1 is heat from the two diodes.



At 0.5A the noise is 87mV rms and 873mVpp.



At 1A the noise is 102mV rms and 803mVpp.



At 2A the noise is 107mV rms and 547mVpp, noise is a bit high.



Tear down



I tried some pressure, but it did not work, instead I cut it open.



On this side is a fusible resistor (FU) used as fuse and the safety capacitor (CY1). The marking on the capacitor is not very clear, but it looks like 472, i.e. 4.7nF. That would be about 677kOhm at 50Hz or 340uA with 230VAC, this can explain the slightly high leakage current (The capacitor is not directly connected to mains, this is the reason for the current being below 340uA).








On this side is the bridge rectifier (DB1) and the mains switcher (IC3: TD6512). The low volt side uses two diodes (D3 & D4) in parallel for rectifications.





With a slot the minium legal distance is 4mm and above 6mm without a slot, here the distance is much shorter at 1.5mm and 4.5mm.



The charger passed the 2830 volt and 4242 volt test, but the leakage current is too high (I measured 270uA at 230VAC).




Conclusion

The charger can deliver the rated power, the coding is usable, but missing any marking, the noise a bit high.
The safety is not very good I would not use this charger at 230VAC, it is also doubtful at 120VAC



Notes

The charger was supplied by a reader for review.

Index of all tested USB power supplies/chargers
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How does a usb charger work?

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Test/review of Electronic load Web UL-001 Enterprise

January 28, 2019, 6:58 am

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Electronic load Web UL-001 Enterprise



Official specifications:

• Maximum power: 12W
  
• Current: 0.2 – 2.5A
  
• Voltage: 5 – 24V
  

I bought from Aliexpress dealer: Best Market Place



Like many devices from China this arrives in the shipping box and with only bubble wrap around it, no retail box or instruction sheet.



This load must be designed by a Star Trek fan.



I will look at the electronic further down.



This load is the smallest one in this series, it do not have a fan, only a covered heat sink.
Between the usb-c connector and the heat sink is a blue led that is on when the load is powered.



It have 3 input connectors and one output connector. The current adjustment is done with a coarse and a fine potentiometer



There is a socket for a fan, but it is not used on this model.


Load testing

• Minimum current is about 27mA, but raises to 45mA below 4 volt.
  
• Maximum current is about 2.7A
  
• It is difficult to adjust current precise, even with the two adjustment.
  
• Data lines are passed through, i.e. it is possible to use a QC trigger on the output connector.
  
• Load do not have any overload protection, it is up to the user to reduce current at higher voltages.
  
• The load has USB-A, micro usb and USB-C connectors, all in parallel.
  
• USB-C connector includes resistor to turn usb-c output on.
  
• Current change during 60 minutes with 2.5A load at 5V is 0.095A, i.e. 3.9%
  

The current is not completely stable and at 2.5A the maximum input voltage is 5V (More correctly: 4.8V).



The rated minimum of 0.2A works fine, but when going lower there is some variation in the current.



At full power the current changes when the load gets hot.



M1: 104.2°C, HS1: 128.4°C
The surface is above 100°C, better not touch it.



M1: 119.7°C, M2: 116.5°C, HS1: 154.3°C



M1: 102.5°C, HS1: 170.5°C
The load transistor is 170°C, this is way too hot.




A look at the circuit



I had to remove 3 screws to open it.




On the back of the top there is another Enterprise graphic and because it is symmetrical it is possible to turn the lid around and use it.



The electronic is packed at the two ends, behind the usb connetors is a OpAmp and a voltage regulator. At the other end is the shunt current is measured across and a reference. This is the classical analog electronic load design.



The transistor handling the load is a TIP122 that can handle 5A and up to 65W, it must not be warmer then 150°C



Conclusion

It is a fun idea to design a load to look a bit like Enterprise, but the performance of this load is not very good, it gets way to hot when running at maximal power and the heat will also change the actual load current.

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[Review] XTAR EU4 - 3xUSB-A, 1xUSB-C power supply

January 30, 2019, 8:12 pm

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USB Power Device Reviews

This is the first review I've posted on my own site, read it there for the best experience!

The Product

XTAR sent me over their new EU4 to review. This is a USB power supply with 1 QC3 port, 2 USB-A ports, and a single USB-C port. It also has a display that can show status, voltage, current, and capacity has been output.

Spoiler

I've had a very similar product to this tucked away inside my nightstand for longer than I can remember, and it's one of the handiest pieces of tech I own. This one adds USB-C and a display, both of which are great upgrades, and pretty unique on the market.
I wish this didn't make you pick between the ports and could access them all at once, or was at least a bit better at intelligently selecting ports - but overall I really like it, and I'm glad XTAR is getting into this market. I'm also extremely excited to see another manufacturer embracing USB-C.

Physical Dimensions

The charger itself measures 92.8 by 65.8 by 28.7 mm. There is no external power adapter or brick required, which is awesome.

Build

The charger is constructed entirely from dark grey soft-touch plastic. The front of the charger contains the button, and the back-lit LCD display. The brand and product names are also screened onto the device here.

The left side houses the AC-in port.

On the right hand side is the collection of outputs from this charger, all clearly labelled. From top to bottom, there's a QC3.0 USB-A port, two 2.4 A max USB-A ports, and a USB-C port.

The top and back sides of the charger are both bare.

The bottom of the charger is filled with labeling. This includes the input and output specs, as well as all the regulatory labels.

What's Included

The kit you get with this is pretty straight forward - just the charger, the required AC power cord, and some paperwork.

Charging

The charger has two modes that are switched by tapping the button on the front. In the first mode, all three USB-A ports are active. In the second mode, the QC 3.0 USB-A port and the USB-C ports are active. There is no mode in which all 4 ports can be used at once.

The button is also used to turn off the light in the display, if you happen to be using it in a dark room - just long press.

USB-A QC 3.0 (Port 1)

The top USB-A port is always active, as indicated by the "USB 1" label at the top left of the display.

With standard use, this port delivered up to 3.6 A before the over-current protection kicked in. The voltage was extremely stable, barely dropping at all as the current draw was increased.

Triggering QC 3.0, we can see that the charger has no problem delivering up to 1.5 A at 12 V, either. The power delivery dropped off after 1.5 A, but I believe that may be due to my tester trying not to cook itself. Once again, voltage was very stable throughout the test.

Even during this test, delivering over 18 W, the charger didn't get warm to the touch.

USB-A 2.4 A (Ports 2 & 3)

Ports 2 and 3 are active by default. Even if the charger is switched to USB-C mode, these two ports will reactivate when the device in the USB-C port has completed charging. When these are active, "USB 2/3" is shown in the center of the top of the display.

Testing these two ports showed nearly identical performance, as expected. Over-current protection kicked in at 2.75 and 2.70 A respectively, with both ports maintaining good voltage throughout the test. Port 3 showed the voltage dropping down to about 4.8 V right before terminating the charge, but this shouldn't damage any connected devices.

USB-C (Port 4)

USB-C is probably the single most exciting feature of this charger for me. The port needs to be activated by pressing the single button on the charger, and once active the top right of the display shows "Type C". 

The charger will not detect if a USB-C device is inserted when it is in the default mode without pressing the button. If it is switched to USB-C mode and no current is being delivered through the USB-C port, it will switch back to the extra USB-A ports. This is true even if there are no devices connected to ports 2 and 3.

Unfortunately I don't have the equipment needed to test USB-C charging as thoroughly as USB-A, but I can confirm that it had no issues activating rapid charging on a Pixel 3, which confirms that they have implemented USB-PD.

Summary

Pros:

• Extremely handy device
• USB-C is great
• Display can be useful to show charge rate or overall capacity (though it's not the ideal tool for the job)
• No external power brick is great
• QC 3.0 is great for charging mobile devices
• Doesn't get hot during use

Cons:

• USB-C needs to be manually triggered with each use
• Can't use all 4 ports at once, even at a reduced rate

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Test/review of 2USB Charger XKY-029

February 1, 2019, 6:54 am

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2USB Charger XKY-029



Official specifications:

• Dual port: 1.5A
  
• Input: DC 12V – 24v       What? I did not test this, but I doubt it
  
• Output: DC 5V 1.5A
  
• Charge two devices at once, including the latest generation Apple devices, while on the road.
  
• Works with: iPad mini 1/2, iPhone 5/6/6, iPod ,iPad Air 1/2
  
• The USB 2.0 Ports are universal, is 1.5A
  
• Bulit-in protect chip, overcurrent protection, overtemperature protection
  

I got it from ebay dealer smile_cc



This cheap charger arrived in a plastic bag in a plastic envelope without any accessories.










Measurements

• Power consumption when idle is 0.08 watt at both 120VAC and 230VAC
  
• Both USB outputs is coded with usb charger (DCP)
  
• Both USB outputs are in parallel
  
• Weight: 29.6g
  
• Size: 64 × 40 × 28mm
  

Specifications says 1.5A (in listing) or 2.1A (On charger), but the charger has trouble delivering 1A on this port.



And also on this port.



Even with both ports together the current is the same.



At 230VAC it is better at maintaining output voltage, but the 1.1A current is still way below specifications.



Running the charger with 1A total output worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 35.6°C, HS1: 52.4°C
HS1 is the transformer.



HS1: 68.1°C
Here HS1 is the rectifier diode.



M1: 61.5°C, HS1: 63.4°C
On this side it must be the switcher IC.



HS1: 48.1°C



M1: 48.2°C, HS1: 51.0°C



At 0.5A the noise is 129mV rms and 1233mVpp.



At 1A the noise is 153mV rms and 1931mVpp.




Tear down



Some pressure on the enclosure with my vice and the bottom popped off.



This looks to be a very simple charger, there is only a bridge rectifier, a fake safety capacitor (1kV rated) and a rectifier diode.










On this side is the main switcher IC (U1: Marked HC2523B).
The USB connectors are not soldered correctly, they will easily break loose.





The distance between mains and low volt side is about 3mm over the circuit board, this is way to low.
I wonder why there is a slot in the circuit board, it do not improve safety in any way.


The charger passed the 2830 volt test, but failed the 4242 volt test between mains and low volt side, this makes it unsafe for 230VAC countries.



Conclusion

The charger cannot deliver more than 1A with lot of noise, it is missing a fuse, isolation to mains is way to bad.

Stay away from it.



Notes

The charger was supplied by a reader for review.

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?

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