In the classification of power supplies, we mainly produce high-voltage DC power supplies, which are input from AC mains or three-phase power, and output DC voltage of thousands or tens of thousands of volts. The output power ranges from hundreds of watts to several kilowatts, and can generally stabilize the voltage or current. With the development and maturity of switching power supply technology, DC high-voltage power supplies developed by combining high-frequency switching conversion technology with the characteristics of high-voltage power supplies have become mainstream.