Charger

In the early USB charging, due to the lack of standard specifications, universality was the main topic of the early USB charging. In view of this, the USB-IF organization has issued battery charging specifications and defined different power supply types, such as SDP, CDP and DCP. However, with the increase of smart phone functions, 7.5W charging power can not meet people's needs. In some applications, data transmission and power transmission can also be carried out at the same time, so USB PD came into being.