Quick Charging is very useful feature. Our smartphones have more and more powerful processors, graphics modules, cameras, flashes etc. We also install more advanced applications and games. Therefore, modern mobile has much higher power consumption requirements that several years smartphone.

This problem is solved by the batteries with higher capacity. However, higher capacity means longer charging time. This is the reason why Qualcomm has developed Quick Charge feature. We do not have time to plug in our phone to the charger for a few hours. Sometimes we forgot to do this before we go to sleep.

Thanks to Quick Charge 3.0 solution you can charge 2750 mAh from 0% to 80% in 35 minutes.

In case of the conventional charging technique (i.e. 5 V and 1 A) you would get only 20% at the same time. How is it possible? There is no magic. In order to charge faster you have to deliver to your device more power during shorter period. The power is voltage times current. Therefore, Quick Charge 3.0 solution uses the voltage from 3.6 V to 20 V range with 200 mV step and provides the power up to 18 W. Of course, you can achieve the same power level using different voltage and current combinations. However, thanks to INOV (Intelligent Negotiation for Optimum Voltage) solution, the charging is faster than in case of Quick Charge 2.0. What is the problem?

One of Google’s engineers has a doubt about this solution, because USB-C standard predicts only 5 V…

However, we have also USB PD Type-C cables! PD stands for Power Delivery, it means that if you have dedicated cable then you can use voltage higher than 5 V. These cables have special chip containing information about supported power. Therefore, the charger and the phone know what voltage can be used, so nothing will be damaged. However, remember to use only certified accessories. HERE you have the list of devices which support Qualcomm Quick Charge 3.0 technology. I have found also the Qualcomm’s statement concerning this issue.

Qualcomm Quick Charge is designed to be connector-independent. It can be
implemented in a device that supports a variety of connectors, including
USB Type-A, USB micro, USB Type-C, and others. When an OEM chooses to
implement Quick Charge into their device, they can configure the voltage
to fit within the specifications of the USB Type-C standard. We have
received no reports of user experience or device malfunction issues with
or without USB Type-C connectors. At Qualcomm Technologies, we are
continuously working to provide the best solutions for our customers and
consumers. Qualcomm Quick Charge is a leading edge fast charging solution
with more than 70 devices and 200 accessories supporting one of the two
most recent versions of Quick Charge, with even more currently in
development.