How does QC charger set in different voltage range ?

QC charger (Quick charger) work on a protocol in which we can charge our Mobile in different voltage range (5V, 9V, 12V, 20V), 

Mobile Processor sends a signal (voltage signal) to  Charger, with the help of USB data line. Charger receives that signal and charges to the Mobile Battery according to the signal protocol which is received from the Mobile processor. Processor can sends  4 different types of voltage signal  to the Charger. This is standard protocol of Qualcomm company.  You can easily understand that protocol with help of Figure(1).

It is a communication between a Mobile Phone and a Charger. According to the condition of the mobile battery, the Charger charges the Battery at different voltage levels (5V, 9V, 12 V, 20V).

D+	D-	Output Voltage
0.6	0.6	12V
3.3	0.6	5V
3.3	3.3	20V

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