Universal Serial Bus (English: USB) is a serial bus standard that connects computer systems with external devices, and it is also a technical specification of input and output interfaces. It is widely used in information communication products such as personal computers and mobile devices, and extended to other related fields such as photographic equipment, digital TV (set-top box), game consoles, etc. The latest generation is USB 3.1, with a transmission speed of 10Gbit/s, a three-stage voltage of 5V/12V/20V, and a maximum power supply of 100W. The new Type C plug-in is no longer divided into positive