Test/review of BlitzWolf 30W PD charger BW-S11

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HKJ
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Test/review of BlitzWolf 30W PD charger BW-S11

BlitzWolf 30W PD charger BW-S11
DSC_9599
Official specifications:


  • Brand: BlitzWolf®
  • Model: BW-S11
  • Plug: EU
  • USB Port: TYPE-C PD Port + USB Type-A Port
  • Total Power: 30W (Max)
  • Input: AC 100-240V 50/60Hz 0.85A Max
  • Output: Spower: 5V/2.4A (Max)
  • PD/QC: 5V/3A 9V/2A 12V/1.5A (Max)
  • Size: 54.5×54×28.5 mm / 2.2 ×2.1×1.1 inch
  • Color: White
  • Weight: 100g±10g

I got it from Banggood.
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I got it in a white cardboard box with some specifications on it.
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The box contained the charger and a instruction sheet.
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Measurements


  • USB output is coded as Apple 2.4A, Samsung and DCP
  • USB-C is PD with 5V 3A, 9V 2A and 12V 1.5A
  • USB-C output also has QC3
  • There is a blue led inside the charger next to the USB output.
  • Power consumption when idle is 0.12 Watt
  • Weight: 105g
  • Size: 92 × 54.2 × 28.4mm

BlitzWolf%20BW-S11%20230V%20load%20sweep
The regular USB output is rated for 2.4A and can deliver about 2.7A, this is fine.
BlitzWolf%20BW-S11%20PD5V%20230V%20load%20sweep
The PD output is rated for 3A on 5V and can deliver 3.7A, it have some cable compensation.
BlitzWolf%20BW-S11%20PD9V%20230V%20load%20sweep
At 9V the maximum current is down to 2.5A with a rating of 2A
BlitzWolf%20BW-S11%20PD12V%20230V%20load%20sweep
And at 12V the current is limited to 1.8A with a rating of 1.5A, again fine.
BlitzWolf%20BW-S11%20PD12V%20120V%20load%20sweep
Using 120VAC did not change anything.
BlitzWolf%20BW-S11%20230V%20load%20test
For a load test I used 2.4A on USB output and 9V 2A on PD output for one hour, it worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
Temp7055
M1: 69.4°C, HS1: 73.7°C
HS1 is the USB transformer and M1 is the PD transformer.
Temp7056
M1: 60.9°C, HS1: 63.2°C
Temp7057
HS1: 70.4°C
Temp7058
HS1: 62.6°C
Temp7059
M1: 52.3°C, HS1: 72.3°C
10ohm
At 0.5A the noise is 12mV rms and 273mVpp.
5ohm
At 1A the noise is 15mV rms and 241mVpp.
2ohm
At 2.5A the noise is 96mV rms and 965mVpp.
10ohmPD5V
At 5V 0.5A on PD output the noise is 149mV rms and 613mVpp.
2ohmPD5V
At 5V 2.5A on PD output the noise is 14mV rms and 203mVpp.
10ohmPD9V
At 9V 0.9A on PD output the noise is 29mV rms and 278mVpp.
10ohmPD12V
At 12V 1.2A on PD output the noise is 45mV rms and 331mVpp, the noise level is fairly low.
Tear down
DSC_9949
Pressing with my vice I could break one lid of the charger.
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This USB supply has two mostly separate supplies (the input and rectification circuit is shared). AT the mains input is a fuse and a common mode coil. There is two mains smoothing capacitors with a inductor between. The mains switcher transistor for USB output is next to the transformer. Between the two transformers are the safe capacitors. The PD output has its own small circuit board with some parts on it.
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On this side is the mains bridge rectifier (BD1). It has the mains switcher transistor for the QC output. The switcher controller for the QC output is a small 6 pin chip hidden below the black paper. The switcher controller (U7) for the normal USB output is visible. Both switchers has opto feedback, one of them with a slot in the circuit board, the other without.
The USB output uses a synchronous rectifier chip (U9: LN5S19A), it has a auto coding IC (U5) and a reference (431).
The PD output has a rectifier transistor with a synchronous rectifier controller chip next to it, there is nothing to handle PD on this circuit board.
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Handling of PD is done on the small circuit board with the USB-C connector. Here is a chip (U1: WT6155) to handle the PD protocol and a transistor (WSP4407) to turn the output on/off.
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The distance on the circuit board between mains and low volt side is fine.
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But there is an issue with one of the opto couplers, it is around 5.5mm and that is below requirements. The other opto coupler has a slot underneath it and is fine.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
This charger is fine for phones and tablets, but the USB-C PD output cannot be used for laptop computers with only PD support up to 12V. The outputs has a couple of codings and there is individual overload protection on the two outputs.
The slightly low creepage distance is not a serious safety issue.
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?

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

angerdan
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Thanks for the review Thumbs Up

EasyB
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Thanks, HKJ. You might be able to answer this question I have. I want to use one of these USB-C PD ports as a constant voltage source for an adjustable DC-DC converter I have, but I was not sure if this was easily done. It looks like you have done this for your test when you sweep the current at constant voltage. How did you do that? Do you have to signal to the charger to supply constant voltage?
Thanks.

HKJ
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EasyB wrote:
Thanks, HKJ. You might be able to answer this question I have. I want to use one of these USB-C PD ports as a constant voltage source for an adjustable DC-DC converter I have, but I was not sure if this was easily done. It looks like you have done this for your test when you sweep the current at constant voltage. How did you do that? Do you have to signal to the charger to supply constant voltage? Thanks.

I use a PD trigger, they are fairly easy to get. Some types:
ZY1280: https://lygte-info.dk/review/usbMeter%20YZXStudio%20ZY1280%20UK.html
ZY12PDN: https://lygte-info.dk/review/USBmeter%20yzxStudio%20ZY12PDS%20PD%20trigg...
ZL1100

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

RollerBoySE
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I’ve been using BlitzWolf S2 chargers for years, with good results (thanks to your testing approval).
They are now discontinued.
Now I know which ones to get instead (S11)
THANKS!

EasyB
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HKJ wrote:
EasyB wrote:
Thanks, HKJ. You might be able to answer this question I have. I want to use one of these USB-C PD ports as a constant voltage source for an adjustable DC-DC converter I have, but I was not sure if this was easily done. It looks like you have done this for your test when you sweep the current at constant voltage. How did you do that? Do you have to signal to the charger to supply constant voltage? Thanks.

I use a PD trigger, they are fairly easy to get. Some types:
ZY1280: https://lygte-info.dk/review/usbMeter%20YZXStudio%20ZY1280%20UK.html
ZY12PDN: https://lygte-info.dk/review/USBmeter%20yzxStudio%20ZY12PDS%20PD%20trigg...
ZL1100

Thanks, that’s exactly what I want.

angerdan
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EasyB wrote:
I want to use one of these USB-C PD ports as a constant voltage source for an adjustable DC-DC converter I have, but I was not sure if this was easily done.
Do you have to signal to the charger to supply constant voltage?

This QC trigger saves the last configured voltage when powered off:
https://lygte-info.dk/review/USBmeter%20QC2-QC3%20trigger%20UK.html
agent80
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Great review as always. What is the PD requirement for laptops? 24v?

HKJ
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agent80 wrote:
Great review as always. What is the PD requirement for laptops? 24v?

I do not know it, but probably 20V 3A

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/