Compact power supplier for snubber

Snubber is often used as protection device in NBI system for Tokamak heating [1-3]. The present NBI generally use 50/60Hz High Voltage (HV) Insulation Transformers to configure its DC power supplier to offer the bias current to the snubber, which could use the full flux swing of the core from the negative saturation point to the positive one of its BH major loop. Then the snubber weight could be decreased to its half by using the bias power supplier. But this 50/60Hz HV insulation transformer is much heavier than High Frequency (HF) High Voltage (HV) Insulation system. The paper gives the requirement, design and test of this Compact Power Systems based on HF HV technology for Experimental Advanced Superconducting Tokamak (EAST) NBI snubber. Its control strategy is also implemented. Some experimental evaluations have been done to verify the analysis results, which could be used for detail engineering design of power suppliers for EAST NBI based on IGBT.