What is the pd charging protocol? What is USB-PD fast charging?

What does the pd protocol fast charge mean? USB-PowerDelivery (USBPD) is one of the current mainstream fast charge protocols. It is a fast charging specification formulated by the USB-IF organization. . USBPD increases power transmission through USB cables and connectors, expanding the power supply capability of the cable bus in USB applications. The specification can achieve higher voltage and current, the transmission power can reach up to 100 watts, and the direction of power transmission can be freely changed.

The relationship between USBPD and Type-C. People often talk about USBPD and Type-C together, and even call Type-C chargers as PD chargers. USBPD and Type-C are actually two different things, USBPD is a fast charging protocol, and Type-C is a new interface specification. The Type-C interface supports up to 5V/3A by default, but after the USBPD protocol is implemented, the output power can be up to 100W as mentioned above. Therefore, many practical Type-C interface devices will support the USBPD protocol.

The principle of QC3.0 is similar to that of QC2.0, but the voltage output selection of QC3.0 is more flexible.