Qihang QC3.0 Quick Charger Z05
Official specifications:
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Input voltage: 100-240V
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Output: 5V 3A, 9V 2A, 12V 1.5A
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Charger is marked: QH-Z06
It arrived in a partial transparent plastic box.
Measurements
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Power consumption when idle is 0.06 Watt
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USB output is auto coding with Apple 2.4A, Samsung, DCP
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Minimum QC3 voltage is 3.8V
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Weight: 46.3g
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Size: 80.4 x 39.1 x 27.1mm
The overload protection at 5V trips at 4A, this is well above the rated 3A
At 9V it is down to 2.6A
And at 12V it is about 1.9A
At 120VAC is can deliver slight more current.
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.
M1: 52.7°C, HS1: 71.2°C
HS1 is transformer.
HS1: 57.2°C
HS1: 65.4°C
M1: 74.4°C, HS1: 76.0°C
M1: 51.2°C, HS1: 71.7°C
At 0.5A the noise is 46mV rms and 1200mVpp.
At 1A the noise is 197mV rms and 1262mVpp.
At 2.5A the noise is 80mV rms and 1332mVpp.
At 0.9A the noise is 75mV rms and 1456mVpp.
At 1.2A the noise is 97mV rms and 1553mVpp.
Tear down
Mounting the base in my vice I could break the top off with my mallet.
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).
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).
The diode is not really a diode, but a synchronous rectifier
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.
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