Test/Review of Blitzwolf 2 port car charger BW-C4

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HKJ
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Test/Review of Blitzwolf 2 port car charger BW-C4

Blitzwolf 2 port car charger BW-C4

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Official specifications:


  • Input: DC 12-18V (Max)
  • Output: 5V/2.4A *2
  • Power: 24W
  • Size: 61*28*28mm
  • Brand: BlitzWolf®

I got it from Banggood

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Blitzwolf uses a brown cardboard box without much text on the outside.

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The box contained the charger and a note.

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There is a blue led behind the small hole.



Measurements


  • Power consumption when idle is 0.03 watt
  • The 2 usb outputs are in parallel.
  • The 2 usb outputs are auto coding with Apple 2.5A as maximum.
  • No individual port overload protection.


Load%20sweep%2011.6V
Load%20sweep%2014.6V

It do not have any individual port protection and can deliver up to 8A. Efficiency is very good in the rated range (Up to 4.8A).

Voltage%20sweep%204.8A%20input%20current

With 4.8A output it needs about 2.3A at 12V.

Voltage%20sweep%204.8A

Output voltage is stable with changing input voltage.

No%20load%20voltage%20sweep

Idle current is about 2.5mA.

Load%20test%204.8A

A one hour test with 4.8A load was no problem.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2892

M1: 37,3°C, M2: 36,5°C, M3: 38,6°C, HS1: 50,4°C

Temp2893

M1: 39,7°C, M2: 37,4°C, M3: 36,5°C, HS1: 45,6°C

Temp2894

M1: 43,9°C, HS1: 49,3°C

10ohm

At 0.5A with 12V input the noise is 21mV rms and 180mVpp.

5ohm

At 1A with 12V input the noise is 11mV rms and 130mVpp.

2ohm

At 2.5A with 12V input the noise is 12mV rms and 150mVpp.

1ohm

At 5A with 12V input the noise is 45mV rms and 168mVpp.




Tear down

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Cutting the front of the aluminium I could unscrew the circuit board and pull it out.

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The inductor has two wires in parallel to handle the current. The white part beside the spring looks like a fuse.

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The chip is a G5309 10A switcher, this explain why it can deliver about 8A.

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The chip marked U1 handles the automatic coding of the usb outputs. A small white part can be seen beside one of the usb connectors, it is the led.

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Here the auto coding chip is easier to see.

Being a 12V device there is no need to test with high voltages.



Conclusion

This car charger can deliver lots of power, in my opinion a bit to much for the usb cables, but it is still a good charger.



Notes

The usb charger was supplied by Banggood for a review.

Read more about how I test USB power supplies/charger

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

stonew508
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I’ve checked all the reviews here and with Nathan k. And seems there’s no super safe car charger for my pixel phone. Did I miss any of yours that passed the gauntlet?

HKJ
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stonew508 wrote:
I’ve checked all the reviews here and with Nathan k. And seems there’s no super safe car charger for my pixel phone. Did I miss any of yours that passed the gauntlet?

If you mean a car charger with correct overload protection, you are probably correct.

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

stonew508
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Thank you for responding and for your reviews

Nathan K
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stonew508 wrote:
I’ve checked all the reviews here and with Nathan k. And seems there’s no super safe car charger for my pixel phone. Did I miss any of yours that passed the gauntlet?

HKJ, have you ever tested the Belkin F7U005bt04-BLK? It seemed “okay”. I’m curious how a “first rate” company builds their product.

It is actually fully compliant, per my testing. It just happens to have a hardware quirk that makes the Pixel phone in particular not work well. (Voltage drops below 4.95v exactly, so the Pixel phone will stop drawing current.) On the upside, it has $2,500 USD insurance if anything does go wrong!

http://www.belkin.com/us/p/P-F7U005/

Here’s the (meager) writeup I did. It lacks a lot of the details you check for, so please pardon that. Sad I do not have access to a variable DC load or PSU unfortunately.

https://plus.google.com/102612254593917101378/posts/dgqeFSM19bd

Here’s a picture of its overcurrent protection: it appears software-based.

And here’s a picture of the “4.95v bug” I was referring to: it should be charging at ~3a or so (+/-30%), per my previous tests.

PS: Actually, is there any way I can sponsor your tests? Is there an Amazon wishlist I can purchase the Belkin from and send it to you? I will move this thought over to your “request” thread.

HKJ
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Nathan K wrote:
PS: Actually, is there any way I can sponsor your tests? Is there an Amazon wishlist I can purchase the Belkin from and send it to you? I will move this thought over to your “request” thread.

You can always check my website for review, but it do not look like I have tested a Belkin.
People can ship chargers for review (Preferable in original packing) or order directly to me.

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