Ultimate phone charger

This might clear things up.
Quick Charge 3.0 explained: what you need to know (Update: video added)


The major new feature with 3.0 is INOV (Intelligent Negotiation for Optimum Voltage), which allows for a fined tuned power output and a more optimized charging cycle. Firstly, different batteries require different charging voltages. Version 2.0 supported four modes at varying power levels, 5 volts/2amps, 9V/2A, 12V/1.67A, and a 20 volt option. Quick Charge 3.0’s INOV communicates with the device to request any voltage between 3.2V and 20V at 200mV increments, allowing for a wider selection of voltages.

 

Not true.
2.0 supports four modes at varying power levels:
[1] 5 volts/2amps,
[2] 9V/2A,
[3] 12V/1.67A,
[4] 20 volt option.
Quick Charge 3.0 can use any voltage between 3.2V and 20V at 200mV increments which means infinite voltages are possible.
Big difference between the two.

 

Oops. I just noticed.

 

I'm not sure how usb 2.0 or 3.0 data transfer protocol has any relevance to Qualcomm's quick charge 2.0 or 3.0 charging protocol.

 

That's very true but USB data transfer speeds have no relevance to the topic of this thread and I was mistaken in my initial post by using the term USB 2.0 or USB 3.0 when instead I should have been saying Quick Charge 2.0 or Quick Charge 3.0.