MOSFET opening degree detection system and method

The invention relates to an MOSFET opening degree detection system and method. The system comprises an adjustable constant current power supply, a switching power supply, an MOSFET opening degree detection device, a power box and a detected target board. The MOSFET opening degree detection device comprises an MCU1, a peripheral circuit of the MCU1, a relay, a drive circuit of the relay, a current signal detection circuit, a WIFI module, a peripheral circuit of the WIFI module and a signal trigger drive circuit. The tested target board comprises an MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an MCU2, a driving circuit of the MCU2 and a signal conversion circuit; and the power box is used as a driving load of the MOSFET. An external adjustable constant-current power supply is used as a power supply of a detected target board, an external switching power supply is used as a system power supply of the MOSFET opening degree detection device, and the MOSFET opening degree detection device is connect