Qihang QC3.0 Quick Charger Z05 or Z06

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Official specifications:
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It arrived in a partial transparent plastic box.

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Measurements

Qihang%20QC3.0%20Quick%20Charger%20Z05%20QC5V%20230V%20load%20sweep

The overload protection at 5V trips at 4A, this is well above the rated 3A

Qihang%20QC3.0%20Quick%20Charger%20Z05%20QC9V%20230V%20load%20sweep

At 9V it is down to 2.6A

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And at 12V it is about 1.9A

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At 120VAC is can deliver slight more current.

Qihang%20QC3.0%20Quick%20Charger%20Z05%20QC9V%20230V%20load%20test

The charger could deliver 9V at 2A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp7345

M1: 52.7C, HS1: 71.2C
HS1 is transformer.

Temp7346

HS1: 57.2C

Temp7347

HS1: 65.4C

Temp7348

M1: 74.4C, HS1: 76.0C

Temp7349

M1: 51.2C, HS1: 71.7C


10ohm

At 0.5A the noise is 46mV rms and 1200mVpp.

5ohm

At 1A the noise is 197mV rms and 1262mVpp.

2ohm

At 2.5A the noise is 80mV rms and 1332mVpp.

10ohmQC9V

At 0.9A the noise is 75mV rms and 1456mVpp.

10ohmQC12V

At 1.2A the noise is 97mV rms and 1553mVpp.



Tear down

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Mounting the base in my vice I could break the top off with my mallet.

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At the input is a fusible resistor (FR1), it has the usually safety capacitor (CY1) between mains and low volt side and it has opto feedback (Placed below CY1).

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On this side is the bridge rectifier (BD1), the mains switcher (ATC9560) and on the low volt side a large rectifier diode (D3: DK5V100R25C), the QC controller (U4: LP103S) and the voltage reference (U3).

DK5V100R25C

The diode is not really a diode, but a synchronous rectifier

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The distance between mains and low volt must be 4mm over a slot and above 6mm on the circuit board, this charger is below on both counts.


The charger passed the 2830 volt test, but failed the 4242 volt test between mains and low volt side, this makes it unsafe for 230VAC countries.




Conclusion

The charger is a fairly standard QC3 charger with enough output power and good efficiency, but there is a safety problem, the isolation between mains and low volt side is not good enough.




Notes

The USB charger was supplied by a reader for review.

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