Baseus Speed PPS Quick Charger USB+Type C 30W BS-EU905

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Official specifications: I got it from Aliexpress: BASEUS Official Store

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I got the charger in a cardboard box with specifications on.

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It contained the charger and a instruction sheet.

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Measurements

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At 5V the output can deliver about 3.4A and there is some cable compensation.

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At 9V the limit is the same.

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And also at 12V.

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The charger can do QC at 20V, there the current is limited to 2.1A

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And slightly more at 120VAC.

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The PD output has exactly the same current limit at 5V.

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At 12V

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And at 20V

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And at 20V with 120VAC.

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For the load test I used 20V 1.5A, but I could only test on one output.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp7160

M1: 53.0C, HS1: 59.3C

Temp7161

HS1: 50.2C


Temp7162

M1: 53.9C, HS1: 55.2C


Temp7163

M1: 54.0C, HS1: 55.9C

Temp7164

M1: 45.6C, HS1: 58.1C


10ohm

At 0.5A the noise is 10mV rms and 90mVpp.

5ohm

At 1A the noise is 11mV rms and 88mVpp.

2ohm

At 2.5A the noise is 27mV rms and 216mVpp.

10ohmQC9V

At 9V 0.9A the noise is 13mV rms and 110mVpp.

10ohmQC12V

At 12V 1.2A the noise is 18mV rms and 127mVpp.

10ohmQC20V

At 20V 2A the noise is 20mV rms and 142mVpp, the noise is very low.

Because QC and PD uses the same converter I did not measure on PD, they will be similar.



Tear down

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I could open this charger the usually way: Mounting the plug in my vice and banging on the enclosure with my mallet.

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There is a fuse and a common mode coil at the mains input, then 3 smoothing capacitors with a inductor between. The main switcher transistor is mounted on a heatsink that has two layers, one goes on top of the transformer. There is a safety blue capacitor, but it is not easy to see.
The low volt side has a diode (DK5V100R25: Synchronous rectifier) and again 3 smoothing capacitors with a inductor between, this time a rather large inductor due to the high current. The two USB connectors is mounted on a small circuit board or rather two circuits boards.

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The small circuit board contains a controller chip (SW3510). There are probably also two power mos transistors, I can see one of them below the USB-C connector (RU3040), the other is hidden on the back of the circuit board.

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On this side of the circuit board is the bridge rectifier (BD1), the mains switcher (U1: Marked SPt c6). There is also a opto coupler (U2) and a reference (UA1: 431).

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The distance between mains and low volt side is very good.

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



Conclusion

This charger is for one device at a time and it do that very well with low noise, auto coding, lot of power (But not enough for laptops) and good safety. The two output are not really designed to be used simultaneous except with very simple devices.



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?