The PD charger is actually a charger using the PD fast charging protocol. 140w PD charger is one of the most representative ones.The PD charging protocol is a power transmission protocol announced by the USB-IF organization, which is different from other fast charging protocols on the market because the main body of the protocol is different. For example, the QC protocol is a Qualcomm protocol and is formulated by chip manufacturers. Huawei's SCP, OPPO's VOOC, Samsung's AFC and other protocols are formulated by mobile phone manufacturers. Combining various fast charging protocols, USB PD has a wider range of application scenarios, because there is no need to consider the chip and brand, after all, everyone is charged through USB.
Gallium Nitride (also known as GaN) is a material increasingly used in charger semiconductors, used to make LEDs since the 1990s, and is a common material for satellite solar cell arrays. The biggest advantage of using GaN for chargers is that it generates less heat. Less heat generation means components can be placed closer together, so chargers can be made smaller than ever, while retaining all charging functions and meeting safety standards.