AIFECT 5V1A Mobile phone charger WHA-1U-5W

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Official specifications: I got it from ebay dealer orico_daily_deal

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Measurements

AIFECT%205V1A%20Mobile%20phone%20charger%20WHA-1U-5W%20120V%20load%20sweep

The charger can deliver 1.1A, the voltage drops slightly before the 1A, but still within tolerances.

AIFECT%205V1A%20Mobile%20phone%20charger%20WHA-1U-5W%20230V%20load%20sweep

At 230VAC it is more stable.

AIFECT%205V1A%20Mobile%20phone%20charger%20WHA-1U-5W%20load%20test

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

Temp6426

M1: 47.1C, HS1: 63.1C
HS1 is the mains transformer.

Temp6427

M1: 50.8C, M2: 44.0C, HS1: 52.6C

Temp6428

M1: 58.0C, HS1: 61.4C

Temp6429

HS1: 56.0C

Temp6430

M1: 43.0C, HS1: 62.1C

10ohm

At 0.5A the noise is 24mV rms and 197mVpp.

5ohm

At 1A the noise is 29mV rms and 184mVpp, this is low noise




Tear down

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Some pressure with my vice and a bit breaking with a screwdriver and the lid was off.

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There is a fusible resistor (FR1) as fuse, two mains smoothing capacitors (C1 & C2) with a inductor (L1) between. Between mains and low volt side is the usual safety capacitor. The transformer has extended leads on the low volt side to increase creepage distance.

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On this side is the bridge rectifier and the switcher (U1: OB25133 5W). On the low volt side is the rectifier diode (D3) and for some reason somebody has cut into it (May have been the pressure when I opened it). This diode is not very large and do not need to be on a 1A power supply.

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The isolation distance is nearly 6mm, this is slightly low, but nothing serious.


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



Conclusion

The charger can deliver the rated current, has a good coding and low noise. Safety is acceptable.



Notes

The charger was supplied by a reader for review.

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