HQ Universal USB charger P.SUP.USB401
Official specifications:
- Type: USB Adapter
- Input Voltage: 100 - 240AC V
- Output Voltage: 5 V
- Output Current: 1000 mA milliAmps
- Output Power: 5 W Watt
- USB Connection: Yes
- Stabilized: Yes
- Standby Usage: < 0.5 W Watt
Measurements
- Power consumption when idle is 0.2 watt
- Usb output is coded as Apple 1A
- Weight: 45.7g
- Size: 81.2 x 54 x 29.5mm
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.
120AC is about the same.
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.
M1: 45,8°C, HS1: 60,9°C
M1: 42,3°C, HS1: 63,6°C
M1: 53,2°C, HS1: 60,2°C
Noise at 0.5A load is: 50mV rms and 366mVpp.
Noise at 1A load is: 70mV rms and 423mVpp.
Tear down
My vice and a blow from my mallet was needed before I could pry the lid off with a screwdriver.
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.
A single chip (IC1: Probably a AX2535) handles everything and do not need a optocoupler to control the output voltage.
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
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