BlitzWolf QC3 usb charger BW-S9


Official specifications: I got it from Banggood

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Blitzwolf is using a new box for their chargers with some information on it.


The box contained the charger, a usb cable, a instruction sheet and a note.

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The charger can deliver slight above the rated 3A, before overload trips, output voltage raises with load, this means a slight compensation for losses in the cable. This looks good.


At 9V it can deliver the rated 2A, but when overloaded it will not trip an overload protection, the output voltage will drop instead, protection first trips slightly above 3A.


Again it can deliver a bit above rated power, here it drops down to 5V when overloaded to 2A.


It works the same with 120VAC


A one hour test with rated load was no problem.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.


M1: 42,4C, HS1: 60,5C
HS1 is mostly the transformer


M1: 56,3C, HS1: 67,6C
HS1 is the main switcher IC and the transformer.


M1: 39,2C, HS1: 49,4C


M1: 52,1C, HS1: 55,6C


M1: 59,4C, HS1: 67,2C


At 0.5A the noise is 21mV rms and 728mVpp.


At 1A the noise is 27mV rms and 816mVpp.


At 2.5A the noise is 33mV rms and 688mVpp.


At 9V and 0.9A the noise is 29mV rms and 768mVpp.


At 12V and 1.2A the noise is 30mV rms and 684mVpp.

Tear down


Putting it in my vice and giving it a wack with my mallet was enough to open it.


A fairly compact circuit board, but it looks like everything needed is there.
A fuse at the mains input, followed by a common mode coil and a inrush current limiter (NTC). There is an inductor between the two mains smoothing capacitors. A blue safety capacitor is across the transformer.

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The fuse can be seen at the red wire and the transformer has flying leads for better isolation.

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On the first picture the safety capacitor and the inductor can be seen, on the second picture the NTC and inside the white stuff, next to the fuse is the common mode coil.


On this side is the bridge rectifier (BD1), a switcher IC (U1) that handles switching and controlling a synchronous rectifier transistor.
And then there is the smart charge chip (U2: IP2163) that can handle 9 different smart charge standards (It do not look like this charger support all of them).



Safety distance looks fine.

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


This is the most universal charger I have seen to date, the smart charge chip in the charger handles just about any fast charge protocol. The charger can deliver the rated power and safety looks good.
For anybody wanting a charger that can handle many different phones with fast charger, this looks like a good charger.


The usb charger was supplied by Banggood for a review.

Read more about how I test USB power supplies/charger