Usb-if is a fast charging technical specification for PPS (programmable power supply), which is implemented by Qualcomm QC4.0 / 3.0 and MediaTek PE3.0, among the important updates of USB3.0 recently launched. 2.0. The Huawei / OPPO plan is prepared. After the USB PD3.0 is added into the PPS, the output voltage range is expanded from 5V to 3.0V ~ 21V, and the step voltage is 20mV, which can be filled with low voltage and large current.

The PD 3.0 fast charging protocol mainly has the following improvements: first, the detailed description of the battery characteristics inside the device is added;second, the function of software and hardware version identification and software update through PD communication is added. Third, Add digital certificates and digital signatures.