Direct Charging DC 5V 1A USB Charger Y G004

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Official specifications: I got it from Ebay dealer: greatbuydirect66

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It was packed in a plastic bag inside an envelop and included a useless plug adapter (It will not fit most European sockets)

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Measurements

Direct%20Charging%20DC%205V%201A%20USB%20Charger%20Y%20G004%20120V%20load%20sweep

At 120VAC the charger can deliver about 0.8A, this do not really match with the 1A rating.

Direct%20Charging%20DC%205V%201A%20USB%20Charger%20Y%20G004%20230V%20load%20sweep

At 230VAC it can deliver 1A, but not more.

Direct%20Charging%20DC%205V%201A%20USB%20Charger%20Y%20G004%20120V%20load%20test

I did the 1 hour test at 0.8A, this looks fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp6815

HS1: 73.9C

Temp6816

M1: 60.1C, M2: 45.2C, HS1: 60.8C

Temp6817

HS1: 59.8C

Temp6818

HS1: 62.9C

Temp6819

HS1: 71.5C


noohm

The unloaded regulation has some spikes: 25mV rms and 938mVpp

10ohm

At 0.5A load the noise increases to 157mV rms and 1293mVpp.



Tear down

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The front was just clipped on and could easily be removed, not good for safety.

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On this side is a rectifier diode.

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And a fake safety capacitor.

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On this side is the bridge rectifier and the mains switcher chip (Marked PT3773C)

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Creepage distance, we do not use that! There is less than 1mm from mains to low volt side, legal requirement are around 6mm.

The charger failed the 2830 volt and the 4242 volt test between mains and low volt side, this makes it unsafe anywhere in the world.



Conclusion

The power supply has lot of noise, cannot deliver rated current and is dangerous.

Stay away.



Notes

The charger was supplied by a reader for review.

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