The design of an Ohmic heating power supply based on IGBTs for QUEST spherical tokamak

摘要

A new Ohmic heating (OH) system with bipolar circuit is designed to achieve plasma current of 180 kA in QUEST spherical tokamak. IGBT stacks work asswitches to change the polarity of OH primary current. The current up to ±8kA is distributed to IGBTs. An interlock system controlled through FPGA worksfor safe operation of IGBT stacks and high power current sources.