UGreen QC3 charger 36W CD161

DSC_9770

Official specifications: I got it from aliexpress dealer: Ugreen Official Store

DSC_9750 DSC_9751 DSC_9752 DSC_9753

i got it in a white cardboard box.

DSC_9768

It contained the charger and a instruction sheet.

DSC_9771 DSC_9772

DSC_9773

DSC_9775

DSC_9776 DSC_9774 DSC_9777



Measurements

UGreen%20QC3%20charger%2036W%20%231%20230V%20load%20sweep

The 3A QC output can deliver about 3.3A with cable compensation, this is fine.

UGreen%20QC3%20charger%2036W%20%232%20230V%20load%20sweep

The other output is similar.

UGreen%20QC3%20charger%2036W%20QC9V%20%231%20230V%20load%20sweep

At 9V the output current is still 3.3A

UGreen%20QC3%20charger%2036W%20QC12V%20%231%20230V%20load%20sweep

And even at 12V it maintains the 3.3V maximum output current.

UGreen%20QC3%20charger%2036W%20QC12V%20%231%20120V%20load%20sweep

And also at 120VAC.

UGreen%20QC3%20charger%2036W%20230V%20load%20test

For a load test I used 9V 2A and 12V 1.5A for one hour, it worked fine (Both outputs are QC, but I did not change standard my labels on the chart).
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp7074

M1: 59.5C, HS1: 65.6C
HS1 is the transformer.

Temp7075

M1: 50.5C, HS1: 53.6C

Temp7076

M1: 58.9C, HS1: 60.6C

Temp7077

M1: 53.6C, HS1: 57.8C

Temp7078

M1: 51.9C, HS1: 65.0C

10ohm

At 0.5A the noise is 4mV rms and 77mVpp.

5ohm

At 1A the noise is 4mV rms and 137mVpp.

2ohm

At 2.5A the noise is 6mV rms and 147mVpp.

10ohmQC9V

At 9V 0.9A the noise is 5mV rms and 130mVpp.

10ohmQC12V

At 12V 1.2A the noise is 5mV rms and 143mVpp, all very low values.



Tear down

DSC_9929

Mounting the bottom in my vice and whacking the top with my mallet I could open the charger, but getting the circuit board out is not easy, somebody used a lot of glue inside it.

DSC_9930

Loosing up the glue with a thin screwdriver and I could pull the circuit board out.

DSC_9931

The circuit board is rather compact. At the input is a fuse and a inrush current limiter (PTC). There is two common mode coils, one is below the copper heatsink for the mains switcher transistor. The safety capacitor (CY1) can also be seen next to the heatsink. The mains smoothing capacitor is below the heatsink and has a yellow isolation cap on it because it is very close to one of the USB connectors.
The transformer deliver 14.6V DC output to the two smoothing capacitors (C13 & C14: 470uF 25V), this is then handled by two buck converters, each with a inductor and a capacitor (CA4 & ?: 100uF 16V).
Above C10 and RS0 is the synchronous rectifier controller IC.

DSC_9933 DSC_9934

DSC_9935 DSC_9936

DSC_9932

On this side is the input bridge rectifier (BD1), the mains switcher controller (U1: Marked OU=22C) very close to the opto feedback (U2) with the usual reference (U4: BM431). On the low volt side is a synchronous rectifier transistor (Q3: 10R12V). This voltage is then feed to two switcher (UA1 & US1: RH8605E) that reduced the voltage to USB level controlled by two QC controllers (UA2 & US2: Marked FT42JR)

DSC_9937

DSC_9938

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



Conclusion

This is a dual QC3 charger with enough power to drive both output fully with good overload protection. It do have a few codings to make it fairly universal and the output has very low noise.

I will rate this as a good USB/QC charger.


Notes

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