Study on differential mode conducted interference of trigger circuit of high-power thyristors in pulsed power supply

Abstract The trigger circuits of high-power thyristors in pulsed power supply (PPS) contain a large number of pulse transformers, switching MOSFETs (SMFETs) and other passive devices. Fast on-off of SMFETs and pulse transformers often lead to differential mode conducted interference (DMCI) problems in trigger circuits of high-power thyristors. This paper mainly disscusses DMCI problems in trigger circuits of high-power thyristors in the following aspects: initially, circuit models of high-frequency parasitic parameters of pulse transformer and SMFET are established; next, principles of DMCI in trigger circuits of high-power thyristors are investigated; furthermore, DMCI suppression methods are also analyzed; ultimately, experiments have been carried out to verify the theoretical analysis.