The Design Of The Power Supply For The Acceleration Grids Of The Neutral Beam Injectors Of The EAST TOKAMAK Based On PSM Technology

The paper describes the 80kV,80A design of power supply for the acceleration grids of the Neutral Beam Injectors of the EAST TOKAMAK. The design introduces a new solution of 80 uncontrolled dc choppers connected in series making use of pulse step modulation The output voltage is given by the number of choppers which are switched on, and can be controlled by switches for varying in step between 0-100% rated voltage. This paper present a detailed analysis of Capacitor-filtered Three-phase bridge rectifier circuits based on an analytical method and simulation, considering practical condition adequately, for choosing parameters of element. At last, The paper analyzed the failure such as over-voltage over-current etc, and the control and protection methods is proposed. The results of experiment are shown to confirm the validity of the design. The design has some advantages by comparison with conventional dc power supply with tube in series.