After fast charging technology has gradually become popular, many people have already understood the fast charging technology. But as for what the USB PD fast charge protocol is, everyone does not understand. In fact, USB-Power Delivery (USB PD) is one of the current mainstream fast charging protocols. It is a fast charging specification formulated by the USB-IF organization. USB PD 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 as high as 100 watts, and the direction of power transmission can be freely changed.

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