The gyrotron is a microwave vacuum electronic device based on electron cyclotron resonance (ECR), used to produce high power millimeter microwave in controlled thermonuclear fusion research, radar and other important application fields. According to the requirements of anode power supply of 1 MW/105 GHz gyrotron for Tokamak electron cyclotron resonance heating (ECRH), the high-frequency switching power supply technology and pulse step modulation (PSM) were used to develop the solid anode high voltage power supply. The control algorithm of volta...