Qualcomm says manufacturers can decide the voltage levels used on Quick Charge

Qualcomm says manufacturers can decide the voltage levels used on Quick Charge
Qualcomm is at the center of a small controversy involving the Type-C USB port and its Quick Charge 3.1 technology. Apparently there have been some questions about whether Quick Charge 3.1 is running outside the voltage specifications required for the Type-C port. By increasing the voltage to 9 volts or 12 volts, Quick Charge 3.1 allows the internal battery on handsets like the HTC 10 and LG G5 to charge much faster than normal.

According to the specifications of the USB Type-C 3.1 port, the Vbus line should be held in a range between 4.45 volts and 5.25 volts. Thus, Qualcomm's Quick Charge 3.1 would appear to be running too much voltage through the line. And when too much voltage runs through a wire designed for a lower capacity, the results can be shocking.

Qualcomm has addressed the issue with a statement released today. In the statement, the chip maker says that when a manufacturer decides to use Quick Charge, it can set the voltage of the feature so that it can be compatible with the USB port installed on the device. LG and HTC can determine the voltage to use with Quick Charge 3.1 in order to safely run this amount of voltage through the USB Type-C port.


The manufacturers set up the Quick Charge technology to provide quick charges while at the same time they can maintain a safe flow of voltage through the USB port. So far, as Qualcomm has noted, there have been no reports of any problems or injuries.
source: AndroidCentral

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18 Comments

1. bambamboogy02

Posts: 834; Member since: Jun 23, 2012

Where are these 70 devices and 200 accessories supporting one of the two versions of quick charge ? Hope they aren't referring to QC2.0.

2. TerryTerius unregistered

It's highly likely they are including that.

8. vincelongman

Posts: 5628; Member since: Feb 10, 2013

Standard USB Type-C "rapid charge", which is up to 15W, like the Nexus 6P/5X Qualcomm's Quick Charge 3.0, which is up to 18W USB Power Delivery 3.0, which is up to 60W for USB Type-C and 100W for a full USB port AFAIK no phones support USB PD yet, its pretty common in laptops Hopefully next year's phones start using that instead of all the proprietary ones or being limited to 15W

13. TechieXP1969

Posts: 14967; Member since: Sep 25, 2013

Are you going to buy all of them?

14. bambamboogy02

Posts: 834; Member since: Jun 23, 2012

I would like to see what kind of accessories these are. I wouldn't mind a Bluetooth headset with QC2.0 or even 3.1, capabilities .

3. Subie

Posts: 2303; Member since: Aug 01, 2015

"And when too much voltage runs through a wire designed for a lower capacity, the results can be shocking" Nice one Alan!

4. Anonn

Posts: 230; Member since: Jun 04, 2014

NEVER Trust Qualcomm. They repeatedly dined any problems with SD810. Now we know better.

5. phonehome

Posts: 812; Member since: Dec 19, 2014

As long as is a voltage that can't both light and heat up a sleeping room too much.

6. vuyonc

Posts: 1089; Member since: Feb 24, 2014

Is the voltage controlled within software drivers or is it in the hardware?

7. TheUnbiasedGuy

Posts: 50; Member since: Apr 21, 2016

My Mi 4 charges slow with quick charge 2.0 but even after 1 and half year my battery backup is still good.I put it to charge overnight everyday.what I am trying to say is for someone who uses their phones for 2-3 years quick charge can be a bane.Anyone who agrees with me ?? anyone...

9. BobThePro

Posts: 10; Member since: Feb 17, 2016

really? My Mi4 take just over 90 minute to charge. I am guessing you are just not using the default Xiaomi fast charger. SOT is just over 5 hours tho

10. HR_19

Posts: 103; Member since: Aug 09, 2014

The thing no one is addressing here is that Quick Charge requires technology in the charger and the phone to communicate, so that incompatible devices will not be accidentally damaged. What I don't understand, though, is why can't a controller chip be put into devices so that if the device is compatible with Quick Charge, it'll use that technology, and if it's not, it'll go to 5V/3A. I'm not an engineer, but since QC2.0/3.0 require communication anyway, and the USB cable requires special resistors to know compatibility, I feel like it shouldn't be difficult. I have QC2.0 devices (charges, and phones), and if both pieces aren't compatible, it just charges slowly. Why can't this be done with USB C.

11. aznhachi

Posts: 212; Member since: Apr 12, 2016

thanks alan

12. gauthamkailash

Posts: 9; Member since: Jan 23, 2016

it's amazing how oppos Vooc charging is as fast and doesn't even warm up the phone a little bit.

15. Fire5

Posts: 315; Member since: Feb 13, 2015

Fast charge is amazing on my Samsung S7 edge. dirtier I entered and left the smartphone easy loading and up from 20% to 70% in 30 minutes.

16. Shocky unregistered

Looks like Samsung made a good decision to not go with type C this year.

17. Fardon

Posts: 96; Member since: Nov 24, 2014

May explain why some phones charge quicker/slower than others despite having same battery size. For example HTC 10 has 3000mah and uses QC 3.0 yet total charge time is slower than the S7 with 3000mah and QC 2.0

18. jessyi

Posts: 325; Member since: Jan 08, 2015

LG G5 is the fastest charging phone

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