8 port usb charger YC-CDA6

DSC_3098

Official specifications:
I got it at aliexpress: SZ HUIBANG TRADING

DSC_3055 DSC_3056

I got it in a retail package without any accesories.

DSC_3101 DSC_3226

The current marking on the ports are not related to the output capability, but some of them match the coding.

DSC_3240

The display shows voltage, current rating and a animated icon for all ports with loads on. The display may look technical, but it is not, except the animated icons, everything else is just fixed text.

DSC_3100

DSC_3102




Measurements


8%20port%20usb%20charger%20YC-CDA6%20%231%20load%20sweep
8%20port%20usb%20charger%20YC-CDA6%20%232%20load%20sweep
8%20port%20usb%20charger%20YC-CDA6%20%237%20load%20sweep
8%20port%20usb%20charger%20YC-CDA6%20%238%20load%20sweep

All ports looks the same and there is no individual over current protection.

8%20port%20usb%20charger%20YC-CDA6%20load%20sweep

Running all port in parallel I can draw nearly 9A, this is very close to the rated 9.2A.

8%20port%20usb%20charger%20YC-CDA6%20load%20test

I decided to run the one hour load test at 8A and it could handle that.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2866

M1: 73,7C, M2: 56,6C, HS1: 86,9C

Temp2867

M1: 56,0C, M2: 45,5C, HS1: 77,0C

Temp2868

M1: 71,8C, M2: 53,5C, M3: 34,4C, HS1: 76,5C

Temp2869

M1: 65,8C, M2: 53,0C, HS1: 67,2C

Temp2870

M1: 41,2C, M2: 48,4C, HS1: 53,0C

10ohm

The charger has a lot of peak noise at low load: 37mV rms and 1000mVpp

5ohm

The rms noise increase with load: 44mV rms and 953Vpp

2ohm

More noise: 68mV rms and 1200mVpp

1ohm

At 5A the peak noise is not that bad anymore: 88mV rms and 580mVpp

0.6ohm

At 10A it increases again: 107mV rms and 800mVpp



Tear down

DSC_3241

This was closed with a couple of plastic snaplocks, no glue or screws.

DSC_3242

At the input is a fuse. Above the transformer is a heatsink, it has the mains switcher mounted on one side and two rectifier diodes on the other side. There is a safety capacitor and a opto feedback chip (U4).
The connector for the LCD display is marked with the signals and it can be seen that it is a serial databus and some power connections.
There is no EMC parts (Like a common mode coil), this means it will not pass a EMC test.

DSC_3244

A small part of the one rectifier diodes can be seen on the heatsink, screws for both the rectifier diodes can be seen.

DSC_3245

The fuse and the opto coupler is mounted close to this side. The switcher transistor can be seen on the heatsink.

DSC_3246 DSC_3247

The fuse can easily be seen here.

DSC_3243

On this side of the circuit board is the bridge rectifier (D2), the switcher controller (U2) and the chip that check if any usb output is using power (U3). There is no marking on it, but it must be a microcontroller with analog to digital converters. All outputs has a R050 resistor for checking on current consupmtion.
Four usb output has resistors for coding and four has the data pins shorted.

DSC_3248


DSC_3250

There is a Holtek chip to control the display (HT1621B), it can control 128 elements on the display.

DSC_3249

There is virtually no isolation distance, but because the circuit board is coated it can handle the 5000 volt.

Testing with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.



Conclusion

This charger has a fancy display, but it is not very useful. The noise is on the high side and individual port protection is missing, there is also a total lack of any EMC handling. I do not like the safety on the charger.




Notes

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