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Qualcomm Quick Charge 3.0 charger

Posted: Fri Jun 09, 2017 2:45 pm
by 3d4real
Hi,

I've got a simple question: Can I use a Qualcomm Quick Charge 3.0 charger?

For example this one (output 3.6-6.5V / 3A, 6.5-9V / 2A, 9-12V / 1,5A (Max.)):
https://www.amazon.de/gp/product/B01E3M ... IF17&psc=1

Thanks!
Simon

Re: Qualcomm Quick Charge 3.0 charger

Posted: Fri Jun 09, 2017 5:13 pm
by FTrevorGowen
3d4real wrote:Hi,
I've got a simple question: Can I use a Qualcomm Quick Charge 3.0 charger?
For example this one (output 3.6-6.5V / 3A, 6.5-9V / 2A, 9-12V / 1,5A (Max.)):
https://www.amazon.de/gp/product/B01E3M ... IF17&psc=1
Thanks!
Simon
I doubt it - too much risk of applying >5V to a Pi :o
What's "wrong" with using the "official" PSU?**
Trev.
https://www.raspberrypi.org/products/un ... er-supply/
(There are other suppliers)

Re: Qualcomm Quick Charge 3.0 charger

Posted: Fri Jun 09, 2017 5:25 pm
by 3d4real
the problem is the cable. I need at least 2 meters, so I want to plug in a micro USB cable.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Fri Jun 09, 2017 6:14 pm
by FTrevorGowen
3d4real wrote:the problem is the cable. I need at least 2 meters, so I want to plug in a micro USB cable.
An "ordinary" USB cable of >=2 metres could give you additional problems (too much resistance). Better to cut the provided cable and "splice in" an extra length of equivalent cable. The power supply only uses two low, resistance wires for power - a standard USB cable, of similar thickness, will have extra wires and the wire resistance (per unit length) will be higher. More to the point of the suitability of the device - a charger is not the same as a power supply - they do different jobs. A power supply has to supply a "fixed" voltage (for the Pi ~5V) over a large range of current draw, down to a minimum voltage at the maximum current, including cabling losses (for the Pi ~4.6V). A charger's voltage can be allowed to drop more rapidly, it only has to be "just high enough" above the battery's voltage due to the present charge level to maintain charging current to flow (for a typical 'phone battery that's ~3.8V). You can find quite a few measured examples of both "loading" behaviours within my webpages starting here:
http://www.cpmspectrepi.uk/raspberry_pi ... plies.html
Trev.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Fri Jun 09, 2017 6:44 pm
by 3d4real
thanks for your answer. I think I found a power suppy that should fit.
https://www.amazon.de/iTrunk-Raspberry- ... teil&psc=1

Re: Qualcomm Quick Charge 3.0 charger

Posted: Sat Jun 10, 2017 10:53 am
by FTrevorGowen
3d4real wrote:thanks for your answer. I think I found a power suppy that should fit.
https://www.amazon.de/iTrunk-Raspberry- ... teil&psc=1
That should be fine (AFAICT from the details in the link).
Trev.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Sat Mar 17, 2018 2:17 pm
by Doogals
FTrevorGowen wrote:
Fri Jun 09, 2017 6:14 pm
More to the point of the suitability of the device - a charger is not the same as a power supply - they do different jobs.
Is the RPi Zero W more tolerant of using a charger as a power supply? I need temporary power for an in-car setup and considering this 12V splitter which has QC 3.0 USB ports to power a RPi 3 or RPi Zero W:

https://www.amazon.ca/dp/B076C9SHW8/

Also here is a basic layout drawing for the setup:
BBCEEE70-8792-4B6C-B292-64829771080F.jpeg
BBCEEE70-8792-4B6C-B292-64829771080F.jpeg (60.38 KiB) Viewed 6553 times

Re: Qualcomm Quick Charge 3.0 charger

Posted: Sat Mar 17, 2018 2:26 pm
by DougieLawson
The Zero can run from a laptop USB 2.0 socket. The Zero with a WiFi dongle or a ZeroW may be marginal on that low current.

Both will run fine on 1000mA.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Sat Mar 17, 2018 5:00 pm
by Doogals
DougieLawson wrote:
Sat Mar 17, 2018 2:26 pm
Both will run fine on 1000mA.
Thank you for confirming that. The power section of the FAQ says the recommended PSU current capacity is 1.2A, so I was hesitant about purchasing the 12V splitter I linked to because of the Quick Charge 3.0 USB ports that regulate current on demand.

I am also going to purchase a USB voltmeter to see exactly how much current the RPi Zero W is drawing:

https://www.amazon.ca/dp/B00J3JSEG6/

If the 12V splitter provides reliable 5V power is it possible I could power a RPi 3 from the QC 3.0 USB ports?

Appreciate the help with this.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Sun Mar 18, 2018 1:17 pm
by Doogals
DougieLawson wrote:
Sat Mar 17, 2018 2:26 pm
The Zero with a WiFi dongle or a ZeroW may be marginal on that low current.
Ordered the 12V splitter and USB voltmeter, will post results and if the QC 3.0 ports are enough to power the RPi 3 or if a RPi Zero W is required.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Sun Mar 18, 2018 8:30 pm
by Imperf3kt
I know of no voltmeter that measures in amps. That is a job for an ammeter.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Mon Mar 19, 2018 5:25 am
by Doogals
Imperf3kt wrote:
Sun Mar 18, 2018 8:30 pm
I know of no voltmeter that measures in amps. That is a job for an ammeter.
*USB multimeter. I've uploaded a video of testing this setup that shows the voltage and current readings:

viewtopic.php?f=46&t=207962&p=1288231#p1288231

Re: Qualcomm Quick Charge 3.0 charger

Posted: Thu Mar 22, 2018 9:47 am
by smoneck
My raspberry 3b runs fine on a dodocool charger (this one) with Quick Charge 3.0.

Re: Qualcomm Quick Charge 3.0 charger

Posted: Tue Mar 27, 2018 3:15 am
by jrms
i just tested on my motorola charger with quick charge (5V / 3A) and it worked just fine