Simsukian 2A SK22G-0500200Z (Enerpower)

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Official specifications:
I got it from Enerpower

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Measurements


Simsukian%202A%20SK22G-0500200Z%20load%20sweep

The overload protection kicks in at about 2.3A.

Simsukian%202A%20SK22G-0500200Z%20load%20test

There is no problem supplying 2A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2986

M1: 62,5C, M2: 49,3C, M3: 38,5C, HS1: 64,4C
M1 must be the rectifier diode.

Temp2987

M1: 48,1C, HS1: 64,4C
Here HS1 is the rectifier diode.

Temp2988

M1: 56,1C, M2: 34,3C, HS1: 57,9C

Temp2989

M1: 55,6C, M2: 36,6C, HS1: 67,8C
HS1 must be the transformer.

Temp2990

M1: 63,0C, HS1: 66,1C
Both M1 and HS1 must be the transformer.

10ohm

Noise at 0.5A load is 16mV rms and 420mVpp

5ohm

Noise at 1A load is 21mV rms and 400mVpp

2.5ohm

Noise at 2A load is 25mV rms and 460mVpp


Tear down

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I could not pop it open in my vice, but had to cut it open.

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Input has a resistor as fuse and their is a inductor between the two mains capacitors.
This design has a safety capacitor, but no opto feedback.

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On the first picture the mains switcher transistor can be seen between the mains capacitors and the transformer.
On the second picture the input resistor is in the green tube and the part with the colored bands is the inductor.

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The blue part is the safety capacitor.

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The black paper is an important part of the safety in this compact charger.
BD1 is the input bridge rectifier, IC1 is the mains switcher controller.
D3 is the rectifier diode.
The coding resistors are placed around the usb connector.

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The isolation distance good, but the black paper is needed.

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



Conclusion

A good standard charger, there no problems and no smart functions in it.



Notes

The charger was supplied by Enerpower for review.

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