Analysis of static voltage balance of series connected self-power emitter turn-off thyristors

Self-power emitter turn-off thyristor (SPETO) is a high power switching device which could provide power for its gate driver during operation. Self-power function is a major benefit, whereas it brings an issue of large power loss on parallel resistors when two or more SPETOs are in series connection and static voltage balance between them is expected. In this paper, the root reason causing large power loss on parallel resistors is analyzed; a solution that could greatly reduce the power loss is proposed and verified by experimental results.