Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (9): 90401-090401.doi: 10.11889/j.0253-3219.2019.hjs.42.090401


Optimum design of switching speed of suppressor power supply

Junjun PAN1,Zhimin LIU1,2(),Caichao JIANG1,2,Sheng LIU1   

  1. 1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
    2. University of Science and Technology of China, Hefei 230026, China
  • Received:2019-02-19 Revised:2019-04-28 Online:2019-09-10 Published:2019-09-18
  • Contact: Zhimin LIU
  • About author:PAN Junjun, male, born in1991, graduated from Anhui University of Technology with a master's degree in 2013, focusing on power supply system and control characteristic analysis of neutral beam injector
  • Supported by:
    Chinese Academy of Sciences(YZJJ2018QN10)

Abstract: Background

The suppressor power supply is one of the power supplies of the experimental advanced superconducting Tokomak (EAST) neutral beam injection (NBI) acceleration system. The switch of the power uses a gate bipolar transistor (IGBT) with multiple tubes in series. The performance of IGBT is not only related to the reliability of the power supply, but also to the optical characteristics of the ion beam when beam extractions.


This paper aims to match the rising and falling edges of high voltage power supply and suppressor power supply, a scheme of controlling the switching speed of IGBT by capacitive feedback circuit is proposed.


The scheme of controlling the switching speed of IGBT with capacitive feedback circuit was adopted. The capacitive feedback of IGBT was modeled by Pspice software, and simulation was carried out under different parameters. Finally, an experimental platform was built to test the scheme.


The simulation results show that the feedback resistance and the feedback capacitance have opposite effects on the feedback circuit. When the gate resistance and the feedback resistance are large and the feedback capacitance is small, the turn-on speed of IGBT can be adjusted in a larger range and the turn-off speed can be reduced by charging the feedback resistance.


The optimization scheme can achieve the expected performance of suppressing the power supply IGBT switch with high reliability.

Key words: Suppressor power supply, IGBT, Pspice, Capacitor feedback, Switch speed

CLC Number: 

  • TL67,TL62,TM89