5V 2A Dual USB fast charger JC-0080

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Official specifications: I got it from ebay dealer top-in-sell

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This charger arrived in plastic bag inside a envelope.

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Measurements

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It can deliver a bit above 2.1A on the 1A rated output

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And the same on the 2.1A rated output.

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Even using both outputs together is the same 2.1A, but the voltage has dropped, it looks like something inside the charger got damaged during the previous tests.

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Current is the same at 120VAC input.

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For the one hour test I used 230VAC and 2A current, the charger could handle that. This test was done after the above tests and surprisingly I got full output voltage here, but later on the output voltage is low again.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp6673

HS1: 64.5C
HS1 is the transformer.

Temp6674

HS1: 72.4C
Here HS1 is the rectifier diode.

Temp6675

HS1: 58.3C


Temp6676

M1: 70.8C, M2: 52.4C, HS1: 71.5C

Temp6677

HS1: 87.6C

10ohm

At 0.5A the noise is 100mV rms and 864mVpp.

5ohm

At 1A the noise is 162mV rms and 1253mVpp.

2.5ohm

At 2A the noise is 184mV rms and 1138mVpp, this is high values.



Tear down

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Standard procedure for opening: Some pressure in my vice (This usual cracks some of the glue) and a whack with my mallet.

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On this side is a glass fuse (FU) at the mains input, a safety capacitor (CY) and a large diode (D3) on the low volt side.

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On this side is the bridge rectifier (BD1) and the mains switcher (U1: LP3783: 5V 2A).

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It is a good idea with slots in the circuit board to improve isolation, but here it is too short and even with the slot the distance is too short at around 2.5mm

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



Conclusion

The charger has a lot of noise and the problem with low output voltage, this is not very good.
The isolation could handle the high voltage, but the distances are much too short and high humidity will probably spoil the isolation.



Notes

The charger was supplied by a reader for review.

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