Test/review of Qihang Fast Charger QH-Z03

January 25, 2020, 7:58 am

≫ Next: Test/review of Qihang QC3.0 Quick Charger Z05

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Qihang Fast Charger QH-Z03

Official specifications:

• Input voltage: 100-240V
  
• Output: 5V 3A, 9V 2A, 12V 1.5A
  

It arrived in a partial transparent plastic box.



Measurements

• Power consumption when idle is 0.05 Watt
  
• USB output is auto coding with Apple 2.4A, Samsung, DCP and QC3
  
• Minimum QC3 voltage is 3.6V
  
• Weight: 35.7g
  
• Size: 75.6 × 36.6 × 23.7mm
  

The charger is rated for 3A on 5V and deliver about 3.2A, this is fine.

It works the same on 120VAC.

At 9V it matches the 2A rating very nicely.

At 12V it is rather close to the 1.5A rating.

It looks better at 120VAC.

The overload protection must be temperature sensitive, it kicked in after 8 minutes at 2A load on 9V.

Reducing the current to 1.8A and it could handle a 1 hour test.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

HS1: 73.7°C
HS1 is transformer.

M1: 56.4°C, HS1: 62.2°C

M1: 47.4°C, M2: 39.4°C, HS1: 50.5°C

HS1: 57.4°C

HS1: 72.7°C

At 0.5A the noise is 48mV rms and 1835mVpp.

At 1A the noise is 42mV rms and 829mVpp.

At 2.5A the noise is 54mV rms and 1421mVpp.

At 0.9A the noise is 49mV rms and 1156mVpp.

At 1.2A the noise is 69mV rms and 1165mVpp.
Tear down

Putting a lot of pressure on the top of the charger with my vice made the lid pop out.

At the input is a fusible resistor in heatshrink, the two mains smoothing capacitors (C1 & C2) has a inductor (L1) between them. There is a safety capacitors (CY1) between mains and low volt side.




On this side is the bridge rectifier (BD1), the mains switcher (ATC9560), opto feedback, a rectifier diode (D3: probably DK5V85R1… synchronous rectifier), a QC controller (U3: Maybe LP103) and a reference (U4).


The distance between mains and low volt side is fine.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
The charger is a fairly standard QC3 charger with good efficiency, the safety look fine. Like many cheap chargers it do not have any mains filtering, this means the radio emission it probably way above the legal limits.
Notes
The USB 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 Qihang QC3.0 Quick Charger Z05

February 1, 2020, 12:22 am

≫ Next: Test/review of Samsung 1 port EP-TA20EWE (Maybe fake)

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Qihang QC3.0 Quick Charger Z05

Official specifications:

• Input voltage: 100-240V
  
• Output: 5V 3A, 9V 2A, 12V 1.5A
  
• Charger is marked: QH-Z06
  

It arrived in a partial transparent plastic box.



Measurements

• Power consumption when idle is 0.06 Watt
  
• USB output is auto coding with Apple 2.4A, Samsung, DCP
  
• Minimum QC3 voltage is 3.8V
  
• Weight: 46.3g
  
• Size: 80.4 × 39.1 × 27.1mm
  

The overload protection at 5V trips at 4A, this is well above the rated 3A

At 9V it is down to 2.6A

And at 12V it is about 1.9A

At 120VAC is can deliver slight more current.

The charger could deliver 9V at 2A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 52.7°C, HS1: 71.2°C
HS1 is transformer.

HS1: 57.2°C

HS1: 65.4°C

M1: 74.4°C, HS1: 76.0°C

M1: 51.2°C, HS1: 71.7°C

At 0.5A the noise is 46mV rms and 1200mVpp.

At 1A the noise is 197mV rms and 1262mVpp.

At 2.5A the noise is 80mV rms and 1332mVpp.

At 0.9A the noise is 75mV rms and 1456mVpp.

At 1.2A the noise is 97mV rms and 1553mVpp.
Tear down

Mounting the base in my vice I could break the top off with my mallet.

At the input is a fusible resistor (FR1), it has the usually safety capacitor (CY1) between mains and low volt side and it has opto feedback (Placed below CY1).



On this side is the bridge rectifier (BD1), the mains switcher (ATC9560) and on the low volt side a large rectifier diode (D3: DK5V100R25C), the QC controller (U4: LP103S) and the voltage reference (U3).

The diode is not really a diode, but a synchronous rectifier


The distance between mains and low volt must be 4mm over a slot and above 6mm on the circuit board, this charger is below on both counts.
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 is a fairly standard QC3 charger with enough output power and good efficiency, but there is a safety problem, the isolation between mains and low volt side is not good enough.
Notes
The USB 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 Samsung 1 port EP-TA20EWE (Maybe fake)

February 8, 2020, 8:17 am

≫ Next: Test/review of Flowme 2 port with LED display HKL-USB36

≪ Previous: Test/review of Qihang QC3.0 Quick Charger Z05

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Samsung 1 port EP-TA20EWE (Maybe fake)

Official specifications:

• Input: 100-240V 50-60Hz 0.5A
  
• Output: 9.0V-1.67A 5.0V-2.0A
  
• MODEL: EP-TA20JWE
  

I got it from ebay dealer: swoy1753

It was on a plastic bag inside an envelop.



Measurements

• Power consumption when idle is 0.1 Watt
  
• USB output is coded with DCP and QC2 (5V & 9V)
  
• Weight: 35.4g
  
• Size: 76.0 × 37.7 × 27.8mm
  

It can deliver 3.5A at 5V, that is rather high for a 2A charger.

The output power is lower at 120VAC, but still well above the rated 2A

At 9V it can deliver about 2.2A.

And slightly lower with 120VAC input.

The charger could deliver 9V at 1.66A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 73.0°C, HS1: 80.5°C

M1: 83.6°C, HS1: 86.4°C

M1: 70.3°C, M2: 52.4°C, HS1: 73.4°C

HS1: 80.0°C

M1: 44.4°C, HS1: 79.7°C

At 0.5A the noise is 18mV rms and 529mVpp.

At 1A the noise is 21mV rms and 467mVpp.

At 2.5A the noise is 25mV rms and 410mVpp.

At 0.9A the noise is 25mV rms and 635mVpp.
Tear down

Putting a lot of pressure on the top of the charger with my vice made the lid pop out.

On this side is the input fuse (F01), a MOV (TM01), a common mode coil, two mains smoothing capacitors (C01 & C02) with a inductor (L01/L02) between and a mains switching transistor (Q01).
There is the usual safety capacitor (CY01), partially isolated behind a plastic shield




Here is the bridge rectifier made with four diodes (D01..D04), the mains switcher controller (U01), opto feedback (OP01), the protocol controller (U02) and a reference (U3: 431). The rectification is a normal diode (D21).


The distance between mains and low volt side is about 5mm, this is on the low side.

Because one PCB track goes under the opto couple the distance is down to 4mm there.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
These chargers are usually cheap imitations of the original Samsung, but I got a bit surprised when the QC only went to 9V (This is Samsung protocol) and the teardown shows a rather complex design with better isolation than many cheap chargers, but it is not good enough. The overload protection is at a too high level for a 2A charger.
I do not hope Samsung has ever sold this model, the isolation is not good enough.
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 Flowme 2 port with LED display HKL-USB36

February 15, 2020, 8:33 am

≫ Next: Have we worked with the outdate tech for charging ?

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Flowme 2 port with LED display HKL-USB36

Official specifications:

• Input: AC 100-240V
  
• Output: 5V 2.2A
  
• Net Weight: 55g
  

I got it from Aliexpress: FLOVEME Official Flagship Store

I got it in a cardboard box with some specifications on it.





The charger has a display that shows voltage and current, the led color indicates which on. Current will only be indicated when there is a current draw and the display turns off while charger is idle.
Measurements

• Power consumption when idle is 0.08 Watt.
  
• USB output is auto coding with Apple 2.4A, Samsung, DCP
  
• USB outputs are in parallel.
  
• Voltage display is within 0.01V.
  
• Display turns on at 0.2A and off when below 0.07A for 10 seconds.
  
• The current is combined for both outputs.
  
• Blue led indicate current, green led voltage display.
  
• Weight: 48g
  
• Size: 82.1 × 42.5 × 24.2 mm
  

The current display has good precision.

One output can deliver about 2.3A and the current measurement is before the voltage feedback, preventing voltage drop at high current.

The other output is the same 2.3A

And together it is also 2.3A

Running one hour with 2.2A was no problem.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 46.5°C, HS1: 59.4°C
HS1 is the transformer

HS1: 57.7°C

M1: 59.8°C, HS1: 67.2°C
M1 is the transformer and M1 is the rectifier chip.

M1: 48.1°C, HS1: 48.6°C

M1: 55.4°C, HS1: 58.3°C

At 0.5A the noise is 8mV rms and 143mVpp.

At 1A the noise is 10mV rms and 126mVpp.

At 2A the noise is 15mV rms and 163mVpp, all noise looks fairly low.
Tear down

Mounting the plug in my vice and hitting the body of the charger with my mallet broke it open.

At the mains input is a fuse or fusible resistor. There is two smoothing capacitors (C1 & C2) with a inductor (L1) between. There is a blue safety capacitor (CY1). The low volt side has a small circuit board for the volt and am meter.



The volt and am meter circuit board has a couple of resistors and capacitors, together with a single unmarked chip.

This side has mode capacitors and resistors, the display and the two leds.

On this side is the bridge rectifier (BD1), the mains switcher (U1: FT8393ND1) and a synchronous rectifier (U2: FT8370B 5V/2.4A). There is a current sense resistor (R15: 50mOhm) and two auto coding chips (U3 & U4: MA5889)


Distance between mains and low volt side must be 4mm when there is a air gap, here it is 1mm. A piece of plastic through the gab would have fixed this.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
The charger works fine, but the output power is rather low for two outputs, it would have been acceptable for one output. Generally the charger looks good, but it has a safety problem, I wonder if the missing piece of plastic protection is a production fault on my copy.
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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Have we worked with the outdate tech for charging ?

February 19, 2020, 10:27 pm

≫ Next: Test/review of BlitzWolf 30W QC3 4 port USB Charger BW-PL5

≪ Previous: Test/review of Flowme 2 port with LED display HKL-USB36

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Hi Bros,
A long time I have not come back this site and I’m a bit surprised that a lot of people still care about the charger with QC 2.0, QC 3.0 or even 24W, 36W charger…etc
Sooner or later, we should care about the new tech charger like SamSung, Oppo have worked: 15W, 25W, 45W (fast, faster, super fast charger).

Forget 5V 2A or 5V2.4A, we will go with the new tech like 12v+, 5v 4A or more to increase the SPEED of charging process.
BUT I did not see any test about the new charger like that, have we worked here with the outdate tech of charger ?

To people who has considered to purchase the new NORMAL charger (QC 2, 3 or event 5V 2.4A, 3A…), the current requirement is depend on your phone, even you use a 5V-2A+ charger to your phone, if your phone just accept 1A, the current charge also just got 1A from the charger no more.

Test/review of BlitzWolf 30W QC3 4 port USB Charger BW-PL5

February 21, 2020, 7:19 am

≫ Next: Test/review of 5V 500mA USB charger US plug

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BlitzWolf 30W QC3 4 port USB Charger BW-PL5

Official specifications:

• USB Port: Four Ports USB
  
• Total Power: 30W (Max)
  
• Input: AC 100-240V 50/60HZ 0.8A MAX
  
• Output: QC3.0 Port DC 3.6-6.5V=3A/6.5-9V=2A/9-12V=1.5A
  
• Spower: Port DC 5V=2.4A Each port (Total 12W)
  
• Size: 61*61*30 mm
  
• Net Weight: 126g
  

I got it from Banggood


I got it in a small cardboard box with a label describing the contents.

It contained the charger and a instruction sheet.



Measurements

• Power consumption when idle is 0.11 Watt
  
• Regular USB outputs is coded as Apple 2.4A
  
• Regular USB outputs are in parallel.
  
• QC and regular USB are not connected.
  
• There is a blue led between the regular USB outputs.
  
• QC output is coded as Apple 2.4A, QC3 and Huawei-FCP
  
• QC3 can go down to 4.4V, below it will reset.
  
• Weight: 108g
  
• Size: 96.5 × 61.0 × 30.0 mm
  

Output 1 can deliver a bit above 2.6A. There is some cable compensation (i.e. the output voltage will increase with load).

Output 3 can also deliver a bit above 2.6A

Using all 3 regular output is the same 2.6A

Output current is slightly less at 120VAC.

The QC output can deliver about 3.7A on 5V

This is down to 3.2A at 9V

And about 2.5A at 12V, all well above the rated specifications.

The maximum output current drops slightly at 120VAC, but is still well above specifications.

Running one hour with 5V 2.4A and 12V 1.5A worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 52.9°C, M2: 56.5°C, HS1: 65.8°C
HS1 is the regular USB transformer.

M1: 54.1°C, HS1: 58.7°C

HS1: 57.5°C

M1: 66.1°C, M2: 64.1°C, HS1: 72.0°C

M1: 48.9°C, HS1: 70.9°C

At 0.5A the noise is 7mV rms and 127mVpp.

At 1A the noise is 9mV rms and 138mVpp.

At 2.5A the noise is 10mV rms and 147mVpp.

At 0.9A the noise is 26mV rms and 684mVpp.

At 1.2A the noise is 31mV rms and 825mVpp.
Tear down

I could not break this charger open, but had to cut a bit.

The electronic did not leave the charger easily either, there was a lot of the white stuff to keep it in.




At the mains input is a fuse, followed by a common mode coil. there is two sets of mains smoothing capacitors each wit a inductor between them. These is also two safety capacitors, one for each transformer.
Between the USB connectors are some leds.



There is a production fault at the mains input, one of the wires are not soldered!
On this side is the bridge rectifier (BD1), there is two switcher IC’s, for the regular USB output a small one (U3: OB2502) and for QC a larger all in one (U1: SC1271K). On the low volt side is a synchronous rectifier (U7: OB2005) for USB and the all in one chip only needs a MOS transistor for (U8: MOSFET HYG072N10 100V 80A) synchronous rectification. For the regular usb is two auto coding chip, a single (U2: Marked 1202) and a dual (U4: Marked 1212). The QC3 has its own control chip (U10: FT41).


There is good safety distance between low volt side and mains.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
The charger works fine, but there is no reason for 3 regular USB outputs, the charger only has power for one! The QC output has more than enough power.
Except for the production fault (Missing solder) the charger looks 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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Test/review of 5V 500mA USB charger US plug

February 29, 2020, 7:36 am

≫ Next: Any problem if use the charger with the current lower than the original one of smartphone ?

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5V 500mA USB charger US plug

Official specifications:

• Input: AC 100-220V 50-60Hz 0.1A
  
• Output: DC 5V 500mA
  
• Output Interface: USB Output
  

I got it from Ebay dealer: custom_car_cover

This is a cheap charger and it arrived in a plastic bag inside a envelope.



Measurements

• Power consumption when idle is 0.17 Watt
  
• USB output is coded as Apple 1A
  
• Weight: 20g
  
• Size: 66.0 × 37.6 × 14.5 mm
  

The 0.5A rating is a bit on the high side when the charger is run from 120VAC. It is more like 0.4A.
The voltage is on the high side.

At 230VAC it can deliver 0.7A, but the plug is for 120VAC.

I did the one hour test at 230VAC with 0.5A current and it could do that.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

HS1: 57.9°C
The hottest part in the charger is the transformer.

M1: 44.9°C, HS1: 47.4°C

M1: 41.1°C, HS1: 44.2°C

M1: 43.1°C, HS1: 49.3°C

M1: 35.5°C, HS1: 57.9°C
M1 is probably the rectifier that shows up, but it is not really warm.

At 0.5A the noise is 40mV rms and 392mVpp.
Tear down

After using my vice to crack the glue I could open it with a spudger.

In this side is a fusible resistor (R1) at the input, a transistor to handle the mains switching (Q1), a optocoupler with a zener diode at the low volt side. The rectification is a diode (D3).



This side has the bridge rectifier and the second transistor (Q2) in a two transistor mains switcher. The coding resistors (R7..R10) for USB output is placed below the USB connector.


The distance between mains and low volt side is about 4.5mm, this is considerable lower then the legal requirement.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
I like the enclosure of the charger it looks nice, but that do not really help it. The output power is way to low and using a old type 1A coding for 0.5A charger is not very nice. The charger passes the high voltage test, but the creepage distance is too low, I also doubt the isolation in the transformer.
Notes
The USB 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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Any problem if use the charger with the current lower than the original one of smartphone ?

March 3, 2020, 2:21 am

≫ Next: Test/review of 3A USB socket for 12V and 24V

≪ Previous: Test/review of 5V 500mA USB charger US plug

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Hi bros,

I just bought a SamSung S9 and its original charger info is 5v/2A, 9/1.67A.

I had an Energizer charger model ACA1AUSCMC3 (5V/1A).

I want to use SamSung S9 charger for travel purpose only, will I face any problem with my phone if I use Energizer charger (5V/1A) to charge for my SS9 at home ? is there any prob with SS9 battery or with Energizer charger ?

Thank you in advance to have the clear explanation instead of just yes/no answer.

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Test/review of 3A USB socket for 12V and 24V

March 7, 2020, 7:57 am

≫ Next: Test/review of 4 port QC3 USB charger SLS-B07

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3A USB socket for 12V and 24V

Official specifications:

• Input Voltage: 12-24V
  
• Output: 5V/3A
  
• USB Port: 1
  
• Voltage Meter: Digital display
  
• Measuring Range: 6-36V
  

I got it from ebay dealer: huangjian1992

A plastic bag inside a plastic envelope, fairly standard packing for cheap stuff from Ebay.

I got the charger and two spade terminals for connecting the wires.

The charger is made to be mounted in a hole.

On the back is spade terminals for power input, the front has a lid.

In addition to the USB output there is also a display showing the input voltage and the output current.
Measurements

• Power consumption when idle is 12mA from 12V
  
• Minimum QC3 voltage is 3.6V
  
• USB output is coded as: Apple 2.4A, DCP, QC3, Samsung-AFC, Huawei-FCP
  
• Weight: 26.0g
  
• Depth: 51.2mm with closed lid and including unconnected terminals on the bacl
  
• It will stick 9mm out from a panel and it can be mounted in a 19mm thick panel.
  
• Diameter: 28.4mm for mounting hole and 36.1mm for front.
  

The volt and ammeter are not very precise.

At 5V the charger can deliver about 3.7A.


Input voltage do not matter, current is nearly the same at any voltage.

With QC 9V it can maintain output voltage up to 2.7A, then it starts dropping.

At 12V it can “only” maintain output voltage up to 1.7A

Higher input voltage do not change it.


THe circuit has a cut-off at about 9.5V input voltage.


The cut-off voltage do not change when QC is activated.

The chargers current consumption depends on the input voltage and slightly on the display.

Running with 3A and 5V output for one hour worked fine.

I could also run with 9V output and 2.5A for a hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 54.0°C, HS1: 67.6°C
This photo and the one below is from the 5V 3A test.

M1: 57.7°C, HS1: 66.0°C

M1: 50.5°C, M2: 50.1°C, HS1: 60.7°C
Here is a photo from the 9V 2.5A test.

At 0.5A the noise is 32mV rms and 163mVpp.

At 1.0A the noise is 30mV rms and 134mVpp.

At 2.5A the noise is 40mV rms and 280mVpp.

At 0.9A and 9V the noise is 22mV rms and 120mVpp.

At 1.2A and 12V the noise is 4mV rms and 62mVpp.
Tear down

It was a bit difficult to break open.

There is one combined switcher and QC chip below the inductor. There is a diode in series with the input, i.e. it is protected against wrong polarity on the input terminals.

Typical schematic from the datasheet.

On the other side of the circuit board is the input and output capacitors.



Behind the display is the V&A meter chip, a voltage regulator and a sense resistor.
Being a 12V device there is no need to test with high voltages.
Conclusion
Even though it is a fairly cheap USB charger, I will call it a good one, the used chip supports a couple of codings, it has overload protection and acceptable noise.
Notes
Read more about how I test USB power supplies/charger
Compare car chargers and other DC supplied chargers

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Test/review of 4 port QC3 USB charger SLS-B07

March 15, 2020, 8:20 am

≫ Next: Test/review of Kuulaa PD+QC 36W KL-CD06

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4 port QC3 USB charger SLS-B07

Official specifications:

• Input: 100-240V 50/60Hz
  
• Output: 5V 3.1A
  
• Output QC: 5V 3A, 9V 2A, 12V 1.5A
  

I got it from a reader, I do not know where it was bought.

It arrived in a envelope.



Measurements

• Power consumption when idle is 0.2 Watt
  
• USB coding on the two center sockets auto with Apple 2.4A, Samsung, DCP
  
• USB coding on the last is USB charging (DCP).
  
• USB coding on QC output is Apple 2.4A, DCP, QC3, Samsung-AFC, Huawei-FCP
  
• Minimum QC3 voltage is 3.9V
  
• The 3 regular USB outputs are in parallel.
  
• There is some blue leds to light into the USB connectors.
  
• Weight 49.9g
  
• Size: 88 × 45.2 × 21.1mm
  

A single port can deliver about 2.8A

The same on another port.

And not very surprisingly the same when all ports are used together.

Using 120VAC do not change anything.

The QC output can deliver about 3.75A before output really start dropping, but it is on the low side at around 2.2A.

The 9V looks better, here it can deliver about 2.75A

And the 12V QC output can deliver about 2.1A

But only 1.5A with 120VAC supply.

Loading it with rated current, or a bit less on 5V it could only maintain output for 9 minutes.

Reducing both a bit did help, here I could run for about 23minutes.

With 2.2A on 5V and 1A on QC 12V I succeeded in running the one hour test.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 80.7°C, HS1: 84.3°C

HS1: 82.8°C

HS1: 89.4°C

HS1: 64.7°C

M1: 55.9°C, M2: 69.4°C

At 0.5A the noise is 105mV rms and 836mVpp.

At 1A the noise is 253mV rms and 1541mVpp.

At 2.5A the noise is 159mV rms and 761mVpp.

At 0.5A the noise is 58mV rms and 635mVpp.

At 2.5A the noise is 125mV rms and 1103mVpp.

At 9V 0.9A the noise is 104mV rms and 944mVpp.

At 12V 1.2A the noise is 137mV rms and 1165mVpp. There is a lot of noise on the outputs.
Tear down

Some pressure with my vice and a knock with my mallet and it was open.

On this side is one switcher chip (U1), one opto feedback, two transformers and two fake safety capacitor (? & CY2: 1nF 1kV).
There is two leds between the USB connectors.



On this side is the bridge rectifier (BD1) and the other switcher (U5: TD217), on the low volt side is a synchronous rectifier for 5V (U6: DP4110) and a dual charge optimiser (U7: HC2802). For QC there is also a synchronous rectifier (U8) and a QC controller (U4: HC6602) and a reference (U3: 431).


The connection for the fake safety capacitor runs along the edge of the circuit board up into the mains area, this means the creepage distance is less than a mm.
Testing with 2830 volt and 4242 volt between mains and low volt side failed for both. This makes the charger unsafe anywhere in the world.
Conclusion
With fake safety capacitor and very low distance between mains and low volt side there is only one thing to say:
STAYAWAY
Notes
The USB 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 Kuulaa PD+QC 36W KL-CD06

March 28, 2020, 9:51 am

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Kuulaa PD+QC 36W KL-CD06

Official specifications:

• Input: 100-240V 50/60Hz
  
• Output USB-C: 3.6V-6.5V 3A, 6.5V-9V 2A, 9V-12V 1.5A
  
• Output QC: 3.6V-6.5V 3A, 6.5V-9V 2A, 9V-12V 1.5A
  

I got it from Aliexpress: kuulaa Official Store

It arrived in a Kuulaa plastic bag inside a plastic envelope.



Measurements

• Power consumption when idle is 0.32 Watt
  
• USB-C PD outputs 5V 3A, 9V 2A, 12V 1.5A
  
• USB-C PD output is also coded with: QC3, Huawei-FCP, Samsung-AFC
  
• Minimum QC3 voltage is 4.2V
  
• QC3 output is coded as Apple 2.4A, DCP, QC3, Huawei-FCP
  
• GND is common for the two USB outputs
  
• Weight 66.1g
  
• Size: 74 × 48 × 28.3mm
  

It can easily deliver the rated 3A on the QC output.

And nearly the rated 2A for 9V

At 12V it can only deliver about 1.3A and not the rated 1.5A

Using a 230VAC supply it can easily live up to its rating.

The PD output can deliver 3.5A at 5V

At 9V it is slightly below the rated 2A.

At 12V it is again below the rating.

Using 230VAC it can easily live up to its rating.

I did the one hour run at 230VAC using 9V and 12V output, this only worked for about 10 minutes.

Reducing the current some improved the runtime to 20minutes

After reducing the current a bit more I could run it for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 70.6°C, M2: 59.3°C, HS1: 71.1°C
The two hot spots (HS1 & M1) are the two switcher chips.

M1: 64.2°C, HS1: 66.4°C

M1: 66.0°C, HS1: 67.0°C

M1: 54.0°C, HS1: 58.2°C
Here the hot area is partially due to the transformers.

M1: 55.1°C, HS1: 70.1°C

At 0.5A the noise is 97mV rms and 1121mVpp.

At 1A the noise is 47mV rms and 917mVpp.

At 2.5A the noise is 79mV rms and 917mVpp.

At 9V 0.9A the noise is 69mV rms and 1138mVpp.

At 12V 1.2A the noise is 68mV rms and 1121mVpp.

At 5V 0,5A the noise is 24mV rms and 953mVpp.

At 5V 2.5A the noise is 76mV rms and 970mVpp.

At 9V 0.9A the noise is 32mV rms and 1200mVpp.

At 12V 1.2A the noise is 37mV rms and 1306mVpp. There is a lot of peaks in the noise, probably common mode noise from bad mains filtering.
Tear down

I put some pressure on the enclosure with a vice and could then break the bottom away with my fingers.

The circuit is two nearly identical switch mode supplies, only difference is the output capacitor that is 1000uF for the QC and 470uF for PD. The only common part between the two are the input fuse (F1)
The QC controller (FT41NR) is placed next to the USB connector, the PD controller on a small circuit board.



On this side is the bridge rectifiers (DB1 & DB2), one for each switcher, the opto feedback (PH1 & PH2) and the references (IC4 & IC5: 431).


The PD controller has a PD chip (U1: FP6606C) and a MOS transistor to switch the output on/off.


The distance across the opto coupler is only 4.5mm, this is way below the requirements.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
At 120VAC it cannot deliver rated power and it can never deliver rated power for longer time. The supply is also a bit limited with PD, where the maximum is 12V, not 20V.
The isolation distance between mains and low volt side is on the low side, especially for 230VAC.
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 Baseus Speed PPS Quick Charger USB+Type C 30W BS-EU905

April 18, 2020, 8:33 am

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Baseus Speed PPS Quick Charger USB+Type C 30W BS-EU905

Official specifications:

• Output power 30W
  
• Input voltage: 100-240V
  
• Output Type-C: 5V 3A, 9V 3A, 12V 2.5A, 15V 2A, 20V 1.5A
  
• Output USB-A: 4.5V 5A, 5V 4.5A, 9V 3A, 12V 2.5A
  
• Total output: 5V 5A max.
  
• Size: 58 × 52 × 28mm
  
• Weight: 92g
  

I got it from Aliexpress: BASEUS Official Store

I got the charger in a cardboard box with specifications on.

It contained the charger and a instruction sheet.



Measurements

• Power consumption when idle is 0.13 Watt
  
• USB QC and PD shares a converter, i.e. only one output works when using advanced coding (QC, PD, etc.)
  
• USB QC supports 20V output (This is very uncommon).
  
• PD output supports 5V 2A, 9V 3A, 12V 2.5A, 15V 2A, 20V 1.5A, PPS3-5V 3A, PPS:3-11V 3A
  
• PD output can also do DCP, Samsung, Apple 2.4A, QC3 Huawei-FCP, PE2 & Samsung-AFC
  
• Regular USB output can do Apple 2.4A, Samsung, DCP, QC3, Samsung AFC, Huawei-FCB& SCP
  
• Minimum QC3 voltage is 3.6V
  
• Weight 93.3g
  
• Size: 95.5 × 52.2 × 28.3mm
  

At 5V the output can deliver about 3.4A and there is some cable compensation.

At 9V the limit is the same.

And also at 12V.

The charger can do QC at 20V, there the current is limited to 2.1A

And slightly more at 120VAC.

The PD output has exactly the same current limit at 5V.

At 12V

And at 20V

And at 20V with 120VAC.

For the load test I used 20V 1.5A, but I could only test on one output.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 53.0°C, HS1: 59.3°C

HS1: 50.2°C

M1: 53.9°C, HS1: 55.2°C

M1: 54.0°C, HS1: 55.9°C

M1: 45.6°C, HS1: 58.1°C

At 0.5A the noise is 10mV rms and 90mVpp.

At 1A the noise is 11mV rms and 88mVpp.

At 2.5A the noise is 27mV rms and 216mVpp.

At 9V 0.9A the noise is 13mV rms and 110mVpp.

At 12V 1.2A the noise is 18mV rms and 127mVpp.

At 20V 2A the noise is 20mV rms and 142mVpp, the noise is very low.
Because QC and PD uses the same converter I did not measure on PD, they will be similar.
Tear down

I could open this charger the usually way: Mounting the plug in my vice and banging on the enclosure with my mallet.

There is a fuse and a common mode coil at the mains input, then 3 smoothing capacitors with a inductor between. The main switcher transistor is mounted on a heatsink that has two layers, one goes on top of the transformer. There is a safety blue capacitor, but it is not easy to see.
The low volt side has a diode (DK5V100R25: Synchronous rectifier) and again 3 smoothing capacitors with a inductor between, this time a rather large inductor due to the high current. The two USB connectors is mounted on a small circuit board or rather two circuits boards.



The small circuit board contains a controller chip (SW3510). There are probably also two power mos transistors, I can see one of them below the USB-C connector (RU3040), the other is hidden on the back of the circuit board.

On this side of the circuit board is the bridge rectifier (BD1), the mains switcher (U1: Marked SPt c6). There is also a opto coupler (U2) and a reference (UA1: 431).


The distance between mains and low volt side is very good.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
This charger is for one device at a time and it do that very well with low noise, auto coding, lot of power (But not enough for laptops) and good safety. The two output are not really designed to be used simultaneous except with very simple devices.
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 USB tester Atorch UD18 (Hidance)

April 26, 2020, 8:03 am

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USB tester Atorch UD18 (Hidance)

Official specifications:

• Voltage: 3.600 – 32.00 V
  
• Current: 0.000 – 5.100
  
• Power calculation: 000.00 – 163.00 W
  
• Capacity accumulation: 0 – 99999 mAh
  
• Power accumulation: 0 – 999.9 Wh
  
• Temperature: 0 – 80 °C
  
• Timing time: 999H59M59 S
  
• USB D+ voltage: 0 – 2.99 V
  
• USB D- voltage: 0 – 2.99 V
  
• Over-C: Overcurrent protection>5A
  
• Over-V: Overvoltage protection>30V
  
• Low-V: Low voltage protection

I bought this from Aliexpress dealer: HIDANCE Official Store

The QR codes is a link to documentation and application on the mediafire.com server.

The box included the tester and a manual.
The tester supports an external temperature sensor, I bought one together with the tester.


The temperature sensor is a small NTC with a USB connector.

There is a couple of connections around the tester: USB-A, USB-C and DC 5.5/2.5mm barrel jack, all with both male and female




Display and functions
The meter has a two screen and a screen off function, they are selected with a click on the M button.

The main screen with lots of functions, holding down the OK button will rotate the screen in 90°C steps.
Holding down the M button will enable adjustment of the FCOP value, release and hold down again to move through: xW, xxM, TC, Over-C, Over-V, LOW-V, mAh, Wh and T. It is fairly slow to move between the different settings!

This display has higher resolution and can be rotated in 90°C steps.

The output can turn off due to a couple of conditions, one of them is over current.

The “FCOP” is Full Charger Off Power function, when it is on the output will be turned on when the power consumption is less than the “xW” value for xx minutes “xx M”.

With the thermosensor plugged in the display will show the temperature.

Holding the button down when powering on enters the configuration mode. Default standby brightness is 3, but I prefer full brightness all the time and turned it up to maximum.
Measurements
Measurements are done on USB A ports.

The meter needs some voltage before it will work or external voltage. The current input cannot zero correctly at low voltage.

The precision is fairly good, but there is no reason for this many digits.

• Own current consumption is 26mA at level 9 (Default 16mA at level 5).
  
• With display off own current consumption is 9mA
  
• Will measure current in both direction, but do not show actual direction (Reverse direction will include its own current consumption).
  
• Extern power do not override USB power, i.e. the 26mA will be drawn from a 5V or higher USB supply, even with external power connected.
  
• Internal resistance is about 0.11ohm including connection resistance with USB A connectors.
  
• Input voltage must be above 3.5V for the meter to work or external power must be connected.
  
• Current reading changed 0.2% after 30 minutes at 4.9A
  
• Voltage reading changed 0.2% after 30 minutes at 4.9A
  
• Remembers Wh and Ah when power is off
  
• Voltage display is within 0.01 volt in the 3.5 to 30.0 volt range.
  
• Current display is within 0.004 ampere in the 0 to 5.0 ampere range with 5 volt supply.
  
• USB C input do not turn on a PD supply, something connected to the USB C output must do that.
  

M1: 45.4°C, HS1: 59.2°C
This is the display side after 30 minutes with 4.9A.

M1: 53.6°C, M2: 49.0°C, HS1: 58.6°C
Android application
The QR code points to a directory with software and documentation for a couple of devices. As usual the mediafire server opens extra windows with ads when downloading from it.
I did not have any success with the Bluetooth connection, my phone (Android 9) would not connect to the UD18 device.

Screendump from the unconnected application, this application is for many different devices. It starts in Chinese mode.
Tear down

There was no screws in this tester, I could just pull it apart.

On this side is the display with some electronic beneath it.





The two 8 pin chips a transistors (4447A) connected to handle bidirectional power, the sense resistor is from DALE (12mOhm). There is a 3 pin voltage regulator chip (6203A) and the two chips with removed number is probably the ADC and the microprocessor. Bluetooth is a blue module.




There is nothing on this side.

Conclusion
This meter is rather universal with USB-A/B, micro, USB-C and 5.5/2.5mm barrel connectors and it has the typical functions for USB meters and with good precision (The 6 digit mode is silly, but 4 digit is fine). In addition to this it has a lot of options for turning off power, including a nice end-of-charge detection. With the temperature probe it is possible to see how hot a phone gets with normal contra quick chargers. The only real problem is the Bluetooth, that did not work with my phone.
Notes
How do I make the test

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Test/review of Orico 4 port desktop charger DCV-4U

November 22, 2019, 7:14 am

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Orico 4 port desktop charger DCV-4U

Official specifications:

• Model: ORICODCV-4U
  
• Ports: 4 USB charging ports
  
• Dimensions: 98 × 45 × 26
  
• Input: 100-240V 50/60Hz
  
• Output: 5V 2.4A each port
  
• Max. Output: 5V 4A 20W
  

I got it from aliexpress dealer: Orico Official Store


I got it in a brown cardboard box.

It contained the charger, a mains cable and a instruction sheet.




Measurements

• USB outputs are auto code with Apple 2.4A, Samsung and DCP
  
• USB outputs are in parallel.
  
• Power consumption when idle is 0.12 Watt
  
• Mains cable resistance is 2×31mOhm (Good cable)
  
• Weight: 110.6g
  
• Size: 99.4 × 45.9 × 26.6mm
  

There is no individual port protection on the outputs.

All outputs looks similar.

Running all in parallel I could draw 4.5A before the overload protection trips.

It is the same at 120VAC

For a load test I used 4A 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: 50.7°C, HS1: 67.0°C

M1: 46.4°C, M2: 46.9°C, HS1: 51.3°C

M1: 56.0°C, M2: 56.0°C, HS1: 57.5°C

HS1: 59.4°C

HS1: 66.7°C

At 0.5A the noise is 14mV rms and 450mVpp.

At 1A the noise is 17mV rms and 472mVpp.

At 2.5A the noise is 21mV rms and 481mVpp.
Tear down

The bottom was glued on, it was a bit difficult to pry it loose. Notice the plastic shielding that poke through the circuit board, this is a very good sign for safety.

Circuit board is out, I could pull it out.

At the input is a fuse followed by two common mode coils and four smoothing capacitors. The main switcher transistor (Q1) is mounted on a small heatsink (HS1). Besides the main transformer is opto feedback (U2) and on the other side a safety capacitor (CY1). The rectifier (Q2) is mounted on a slightly larger heatsink (H2).




On this side is the input bridge rectifier, the mains switcher controller (U1: Marked 01H16).
On the low volt side is a synchronous rectifier controller (U4: Marked I9HJB), a voltage and current control chip (U3: Marked G7L) with a current shunt (RS1: 15mOhm) and two dual auto coding chips (U5 & U6: D1524).


The distance between mains and low volt side is 6mm.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
This is a very compact 4 output USB charger with automatic coding of the outputs, but it only has enough current to fast charge two devices at a time.
This is a fairly good charger for keeping a couple of USB devices charged.
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 Xiaomi Mi 65W USB-C charger CDQ07ZM

November 30, 2019, 8:01 am

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Xiaomi Mi 65W USB-C charger CDQ07ZM

Official specifications:

• Name: xiaomi USB-C charger 65W
  
• Model number: CDQ07ZM
  
• port: USB-C
  
• Input: 100-240V – 50/60HZ 1.8A
  
• Output: 5.0V- 3.0A / 9.0V- 3.0A / 12.0V- 3.0A / 15.0V- 3.0A / 20.0V- 3.25A
  
• Size: 60*57*28mm
  

I got it from aliexpress dealer: Dtop Store

I got it in a cardboard box with specifications on the back.

The box contained the charger, a usb cable and a instruction sheet in Chinese




The supplied cable can handle 3.25A with USB-C
Measurements

• Power consumption when idle is 0.08 watt
  
• PD output supports: 5V 3A, 9V 3A, 12V 3A, 15V 3A, 20V 3A, 20V 3.25A
  
• PD output also support DCP and QC3
  
• Default PD output is off.
  
• Weight: 115g
  
• Size: 61.3 × 57 × 28mm with legs folded
  

At 5V the overload protection is at about 3.1A, this is very good for a 3A rating.

It is the same at 9V

And 12V

15V is also 3.1A

And 20V is also 3.1A. Oops something is wrong, the charger is rated for 3.25A at this voltage. The reason is the cable, it is raporting 3A as max current.

With a 5A cable the current limit is moved to about 3.3A. I was a bit impressed that it not only change the electronic report, but also change current limit depending on cable.

For a load test I used 20V 3.25A for one hour, it worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 61.3°C, HS1: 62.9°C

M1: 62.7°C, M2: 64.4°C, HS1: 67.1°C
HS1 is the transformer.

M1: 69.6°C, M2: 52.0°C, HS1: 70.7°C
Again HS1 is the transformer and M1 is the rectifier transistor.

M1: 63.7°C, HS1: 72.0°C
Here HS1 must be the output transistor

M1: 59.7°C, HS1: 67.1°C


At PD 5V 0.5A the noise is 23mV rms and 300mVpp.

At PD 5V 1A the noise is 12mV rms and 238mVpp.

At PD 5V 2.5A the noise is 11mV rms and 233mVpp.

At PD 12V 1.2A the noise is 18mV rms and 304mVpp.

At PD 20V 2A the noise is 33mV rms and 414mVpp, all noise values are fairly low.
Tear down

I did not believe I could break it open and went directly to cutting.

The circuit is hidden in shielding, bit top and bottom.

A bit of soldering and breaking and I had removed the shields.

At the mains inpu is a fuse (F1) followed by a common mode coil (LF1) and a bridge rectifier (BD1). Near the bridge is also a blue safety capacitor. On the other side of the USB-C connector is the PD controller (U4: WT6632F S65). The chip behind the usb connector must be a output transistor to enable/disable usb output.



The mains switch transistor (Q1) did have a pad on it for heat transfer to the metal shield, next to the transistor is the switch controller (U1) and the opto feedback (U2).
On the low volt side is a synchronous rectifier controller (U3: Marked ACDDB) and the rectifier transistor (Q3)
I wonder what U5, Q6 and Q7 do.


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 good PD charger and it can also be used for devices that do not know the PD protocol, but uses QC instead.
With slightly above 3A it can also be used to check if cables allows more than 3A, it is not always marked on the cable.
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 USB Charger QC3 4 port charger KeKe-QC-04

December 6, 2019, 8:17 am

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USB Charger QC3 4 port charger KeKe-QC-04

Official specifications:

• Input voltage: 100-240 V 50-60Hz
  
• Output: 5 V / 3 A (max.)
  
• Support QC3
  

I got it from ebay dealer: nctqkj2-2017

No fancy packing for this, just a white plastic envelope with the charger in it, no accessories or instruction sheets.



Measurements

• Power consumption when idle is 0.23 watt
  
• Regular USB outputs are coded as USB charger (DCP)
  
• Regular USB outputs are in parallel.
  
• QC output is coded as Apple 2.4A, DCP, QC3, Samsung-AFC, Huawei-FCP
  
• Minimum QC3 voltage is 3.7V
  
• There is a blue LED behind the USB connectors
  
• Weight: 55.1g
  
• Size: 88.3 × 45.1 × 26.9mm
  

A single output can deliver 2.25A

Using all 3 regular USB outputs together has the same limit.

The limit is slightly higher at 120VAC.

The QC output can deliver 3.2A at 5V.

And about 2.2A at 9V

And 1.6A at 12V

There is not much difference with 120VAC supply.

Load the supply with 2A on 5V and 1.5A on QC 12V worked for 10 minutes, then the QC output needed to rest.

Reducing the load to 1.2A on the QC output worked better and I could run a 1 hour test.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 45.2°C, M2: 55.5°C, HS1: 79.2°C
HS1 is probably the input smoothing capacitor that is transferring heat to the enclosure.

HS1: 83.0°C
Here HS1 is the 5V transformer.

M1: 84.5°C, HS1: 87.5°C
HS1 is QC transformer and M1 is 5V transformer.

HS1: 73.1°C

M1: 60.6°C, HS1: 78.4°C

At 0.5A the noise is 26mV rms and 542mVpp.

At 1A the noise is 27mV rms and 410mVpp.

At 2A the noise is 57mV rms and 582mVpp.

At 0.5A QC 5V the noise is 45mV rms and 1382mVpp.

At 1A QC 5V the noise is 70mV rms and 1683mVpp.

At 1.2A QC 12V the noise is 71mV rms and 1913mVpp. The RMS noise is fairly low, but the switcher has a lot of common mode noise that shows in the pp noise.
Tear down

I could open it the usually way by mounting the base in a vice and whacking the top with a mallet, but the glue was fairly strong.

With charger that can do multiple USB outputs with different voltages it is always interesting to see how the do it, here they use two mains transformers, one for QC and one for regular 5V.
At the input is a fusible resistor (F1), the QC switcher is on this side (HC2502), between the two transformers is the “safety” capacitor and on the other side of the QC transformer is a opto-coupler for feedback.



On this side is a lot of electronic, there is the bridge rectifier at the input (ABS210), the switcher for 5V (HC2511: 10 Watt) with a synchronous rectifier (HC7703S) on the low volt side, The QC part uses a rectifier diode (U5: ST10100), the QC controller is a 6 pin chip (U6: HC66020) with the support of a reference (U7: 431)


With two power supplies in a small box it is difficult to get enough safety distance between mains and low volt side. I am not sure I have found the worst location, but here is about 3mm this is about half of the required distance.
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
Both safety and 5V output power is bad on this charger. A total of about 2A for 3 USB outputs is way to low. The lack of isolation distance is bad.
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 Xiaomi Dual USB car charger CZCDQ01ZM

December 8, 2019, 10:16 am

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USB Power Device Reviews

Xiaomi Dual USB car charger CZCDQ01ZM

Official specifications:

• Type: Dual USB Car Charger
  
• Input: DC 12-24V
  
• Output: Up to DC 5V 3.6A
  
• Color: Sliver
  
• Metal surface, made by CNC 18 process.
  
• Output 3.6A max, per USB output up to 2.4A.
  
• Intelligent recognition device, provide appropriate current.
  
• Five circuit protection, safety first.
  
• Support Quick charge.
  
• 95% power conversion rate, more effective and more efficient.
  

I got it from ebay dealer: unishow518

Xiaomi likes a white cardboard box with nearly unreadable specifications on the back.

The box contained the charger and a Chinese instruction sheet.

The specifications are on the side of the charger, but with a small font.


Measurements

• USB outputs is coded as Apple 2.4A, Samsung and DCP
  
• USB outputs share gnd connection, but + has separate current sense circuit
  
• Power consumption when idle is 18mA from 12V and 15mA from 24V
  
• Weight: 46.6g
  
• Length: 55mm
  
• Diameter: 24.6mm
  

The first USB output could deliver about 2.8A before overload protection kicked in.

The same with the second output.

When used together the total output is a bit above 5A (Rated 3.6A).


Differences in input voltage do not change this.


The charger works down to about 7V input.

Current consumption depends a little bit on input voltage.

There was no problem running 1 hour with 3.6A load.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 51.0°C, HS1: 56.6°C

HS1: 59.8°C

At 0.5A the noise is 6mV rms and 154mVpp.

At 1.0A the noise is 20mV rms and 143mVpp.

At 2.5A the noise is 4mV rms and 53mVpp, this is very low noise.
Tear down

This was a easy tear-down, I could unscrew the front and take the circuit board out.

On this side is a input fuse, some capacitors, the inductor and two white leds.

On the other side is another capacitor, two more white leds and a “big” gray rubber brick for heat transfer.




Removing the brick reveals the switcher chip (M5402M), it is a smart chip designed for a two port car charger and includes a charge optimizer, separate current limit for the two outputs and over temperature shutdown.

Being a 12V device there is no need to test with high voltages.
Conclusion
This charge is a very good standard charger with auto coding, low noise, individual current limit and at good level.
The 3.6A is probably due to cooling, the chip is rated for more output current.
Notes
Read more about how I test USB power supplies/charger
Compare car chargers and other DC supplied chargers

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Test/review of Orico 3-port Mobile Phone Charger WHC-3U

December 14, 2019, 8:39 am

≫ Next: Test/review of PD trigger P30 (Hidance)

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Orico 3-port Mobile Phone Charger WHC-3U

Official specifications:

• Brand Name: Orico
  
• Output Interface: USB
  
• Max. Output Power: 15w
  
• Quality Certification: RoHS
  
• Quality Certification: ce
  
• Model Number: WHC-3U
  
• Applied Fast Charge Protocols: No Support
  
• Power Source: USB
  
• Input: 100-240V/0.3A
  
• Type: Travel
  
• Item: ORICO 3-port Mobile Phone Charger
  
• Material: PC+ABS Fireproof
  
• Input: AC 110-240V 50/60HZ 0.4A
  
• USB Output: 5V2.4A*3, MAX15W
  
• Protection: Over-heated/Over-current/Over-charging protection
  
• Plug: EU Plug
  
• Color: Black/White
  

I bought it from Aliexpress store Orico Official Store

It arrived in a cardboard box with specifications.

The box included the charger and a instruction sheet.



Measurements

• Power consumption when idle is 0.06 watt
  
• USB outputs are coded as auto with Apple 2.4A, Samsung, DCP
  
• Weight: 68g
  
• Size: 88.4 × 58.3 × 27.3mm
  

The first output can deliver 3.7A

The same with another output.

And all outputs together is also 3.7A

At 120VAC it drops to 3.5A, this better than the rated 15 Watt

The charger can deliver 3A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 65.5°C, M2: 42.3°C, HS1: 65.8°C

HS1: 56.7°C

M1: 63.8°C, HS1: 69.0°C

HS1: 68.2°C

M1: 47.8°C, HS1: 64.7°C

At 0.5A the noise is 7mV rms and 339mVpp.

At 1A the noise is 10mV rms and 330mVpp.

At 2.5A the noise is 22mV rms and 362mVpp, generally the noise is low.
Tear down

As usually with this design I could mount the base in my vice and break the top off to open it.

On this side is the input fuse (F1: 2A), two mains smoothing capacitors (EC1 & EC2) with a inductor between (L1). The safety capacitor (CY1) is mounted close to the USB connectors. There is a large switching transistor (Q1). On the low volt side is also two smoothing capacitors (EC4 & EC5) with a inductor between. Both inductors are glued to a nearby capacitor to make it more stable if the charger is dropped.



The mains switcher (U1) is a rather small chip. On the low volt side is the synchronous rectifier (U2: Marked OSC7710) and two auto coding chips (U3 & U4)


The distance between mains and low volt side is well above 6mm.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
The charger is nicely designed with low noise, good safety and auto coding. Only problem is that is has 3 USB outputs, but not much more power than one output can use.
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 PD trigger P30 (Hidance)

December 16, 2019, 6:41 am

≫ Next: Test/review of Sony USB charger 5V 1500mA EP880

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PD trigger P30 (Hidance)

This device is a trigger to access PD voltages on a USB-C charger.
I got it from Aliexpress dealer: HIDANCE Official Store

There was no fancy packing or instructions included with the device, it was in a small plastic bag.

It will show output voltage, this is a measured value with low resolution.

Increasing the voltage will drop the decimal point.

When drawing current it will also show a measured current.
Measurements

• The trigger will remember selected PD voltage without power.
  
• It will enabled output voltage on a PD supply when connected.
  
• For maximum current check the specifications of the used power supply
  
• Power consumption of trigger is 5 to 6mA
  
• Trigger uses 3A mode.
  
• The USB output is not coded but passed the data line through to the USB-C connector
  

Holding down the up or down button will start a automatic voltage selection test sequence.
Voltage drop including USB-C and USB-A connections:
Minus: 0.116V at 3A -> 39mOhm
Plus: 0.0973V at 3A -> 32mOhm
This is a fairly low resistance and much of it is probably from the connections.
A closer look

The trigger do not have many parts. There are two USB-C input connectors, one can be plugged directly into a USB-C PD charger, the other requires a cable. Between them is a blue led that will turn on when the PD selection works correctly. The small square chip is probably a PD interface chip, the microprocessor is hidden below the display. For local power supply there is a voltage regulator (6203A).
The current sense resistor (10mOhm) is placed next to the USB-A output connector.

Below the display is not only the microprocessor, but also a EEPROM memory chip.




Conclusion
The display makes this trigger very easy to use, because it will always show the output voltage, but I do not like it uses a USB-A output connector. It makes it way to easy to connect 5V only equipment to it and damage the equipment.

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

Test/review of Sony USB charger 5V 1500mA EP880

December 20, 2019, 8:10 am

≫ Next: Test/review of BlitzWolf 36W Quickcharger BW-PL3

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Sony USB charger 5V 1500mA EP880

Official specifications:

• Input voltage: 100-240 V 50-60Hz
  
• Output: 5.0V 1500mA
  

Measurements

• Power consumption when idle is 0.04 watt
  
• USB output is coded as USB charger (DCP)
  
• Weight: 36.2g
  
• Size: 71.8 × 40.0 × 20.6mm
  

The charger do not live up to the rated 5.0V, but is slightly below, it can deliver 1.7A, that is fine for a 1.5A rated charger.

At 120VAC the output voltage is slightly lower that at 230VAC and maximum current is slightly lower.

The charger can deliver 1.5A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

M1: 55.9°C, HS1: 61.4°C
HS1 is the transformer.

M1: 54.0°C, HS1: 62.7°C
HS1 is the circuit board near the switcher transistor.

M1: 55.8°C, M2: 40.9°C, HS1: 60.3°C
HS1 is the rectifier diode.

HS1: 64.3°C
And here the circuit board near the rectifier diode.

M1: 50.9°C, M2: 41.3°C, HS1: 60.5°C

At 0.5A the noise is 10mV rms and 185mVpp.

At 1A the noise is 137mV rms and 406mVpp.
Tear down

The lid could be removed, but the glue was fairly solid.

On this side is a fusible resistor (R1) at the mains input and a inductor (L1) between the two mains smoothing capacitors (C1 & C2), the switcher transistor (T2) do not need a heatsink for this fairly low power charger. Between mains and low volt side is a safety capacitor (CY1). Next to the USB connector is a small heatsink, it is for the rectifier diode on the other side of the circuit board.

A closer look at the small circuit board for the USB connector and the heatsink.



On this side is the bridge rectifier (D1), the mains switcher controller (IC1). On the low volt side is the rectifier diode (D51).
The white plastic between D53/D54 and the pins of the mains transformer is used to increase the creepage distance.


With a slot in the circuit board the distance must be 4mm or more and it is.

Without a slot the distance must be above 6mm, here it is slightly low.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
I am not sure where I got this charger from and if it is the real deal or a copy, but it looks well constructed and fairly safe, i wonder if it is a real Sony.
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/