Power semiconductor devices are the core devices for power electronic devices to realize electric energy conversion and power management. The main functions include frequency conversion, voltage transformation, rectification, power conversion and management, etc., and have energy-saving effects. According to the degree of integration, power devices can be divided into power discrete devices, power ICs, and power modules. Power discrete devices include diodes, thyristors, bipolar transistors, IGBTs, MOSFETs, etc.