HQ Universal USB charger P.SUP.USB401

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Official specifications:

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Measurements


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Output current a bit over 1.3A on a 1A power supply looks fine.
I wonder about the output voltage, it is a bit at low current draw and raises when more than 0.3A is drawn.

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120AC is about the same.

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There is no problem maintaining the rated 1A current.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp3392

M1: 45,8C, HS1: 60,9C

Temp3393

M1: 42,3C, HS1: 63,6C

Temp3394

M1: 53,2C, HS1: 60,2C


10ohm

Noise at 0.5A load is: 50mV rms and 366mVpp.

5ohm

Noise at 1A load is: 70mV rms and 423mVpp.



Tear down

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My vice and a blow from my mallet was needed before I could pry the lid off with a screwdriver.

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A fusible resistor packed in heatshrink on the input, followed by a bridge rectifier made with four diodes. Between the two smoothing capacitors is a inductor (L1). The Safety capacitor is packed in heatshrink.
On the low volt side a round leaded diode is used as rectifier diode.

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A single chip (IC1: Probably a AX2535) handles everything and do not need a optocoupler to control the output voltage.

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There is enough isolation distance.

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



Conclusion

This is a small usb power supply with only 1A output and missing DCP coding, it is safe and works fairly fine, but has not really kept up with the times.



Notes

Charger was supplied by Pro backup (probackup.nl)
My high voltage test is done with a real HiPot tester allowing me to use the correct voltages for US and EU.

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?