The USB PD protocol and the fast charging protocols of other manufacturers are not the same relationship, but an inherent relationship. In the PPS (Quick Charge Technical Specification) released by USB-IF, the USB PD 3.0 protocol already includes Qualcomm QC 3.0 and 4.0, Huawei's SCP and FCP, MTK's PE3.0 and PE2.0, and OPPO VOOC

QC 3.0/2.0 is a pure fast charging protocol that only focuses on charging and only does one-way power transmission. The protocol is to communicate through D+ and D- protocol chips for handshake matching, and then increase and change the charging power by increasing and changing V+ (output voltage) to make charging faster

USB PD is not only a power transmission and management protocol, it can actually change the role of the port, communicate with the active cable through the unique CC pin of the Type-C port, switch the power source or the powered device. Realize many advanced functions such as reverse charging of mobile phone to another mobile phone