Konig Mini USB charger PSUP-GSM02

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Official specifications:

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The box contains the charger and multi device instruction/data sheet without any useful information.

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Measurements


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The charger can easily deliver the rated 2A, over current protection is at about 2.6A

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Or slightly higher when running 120VAC.

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It can run for one hour at full rated load without problems.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp3475

M1: 48,0C, HS1: 63,1C
HS1 is the transformer.

Temp3476

HS1: 68,1C

Temp3477

M1: 48,7C, HS1: 70,4C

Temp3478

M1: 35,7C, HS1: 44,3C
The cable gets slightly warm at full current.

10ohm

Noise at 0.5A load is: 9mV rms and 330mVpp.

5ohm

Noise at 1A load is: 9mV rms and 305mVpp.



Tear down

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Pressing the bottom part with my vice and giving a few wack to the top broke it open.

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It has a fuse at the mains input (F1) and a common mode coil between the two capacitors. Below the transformer is a safety capacitor and a inductor on the low volt side, above the transformer is the rectifier diode and a opto coupler

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In the center is the common mode coil (L1).

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The fuse, the safety capacitor (With markings) and the low voltage inductor is here.

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It looks like this model can also be made with a normal usb connector mounted on the circuit board.

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The switcher IC is hidden below a capacitor.

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On this side the bridge rectifer (BD1) can be found and the voltage reference (IC2). There is also two more rectifier diodes (D3 & D5). As can be seen on the circuit board this design is fairly old.

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The safety distance is good.

The charger failed testing with 2830 volt and 4242 volt, I was very surprised about that, the design looks good enough.



Conclusion

The charger looks good, but mini usb us a bit old and the due to the failed high voltage test I will not recommend it.



Notes

Charger was supplied by Pro backup (probackup.nl)

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