一种三电平功率单元试验方法研究 

周志华 
(湘潭电机股份有限公司，湖南 湘潭 411101) 
 

摘 要：介绍了二极管中点箝位型(NPC) 三电平功率单元的特点及吸收电路，分析了由于主电路漏电流的不同引起电容电压不平衡的问题，提出了一种电压均衡电路及一种适用于NPC 三电平绝缘栅双极晶体管(IGBT) 功率单元双脉冲测试方法，并阐述了NPC 三电平功率单元双脉冲开通过程和理论依据，试验验证了该方法的正确性及可行性。
关键词：中点箝位型三电平；吸收电路；双脉冲测试
中图分类号：TM461 文献标识码：A 文章编号：1007-3175(2016)03-0041-05

Research on a Kind of Power Unit in Three-Level Circuit Test 

ZHOU Zhi-hua 
（Xiangtan Electric Manufacturing Co., Ltd, Xiangtan 4111 01, China） 
 

Abstract: Introduction was made to the characteristics and snubbed circuits of diode neutral point clamped (NPC) three-level power unit.Analysis was made to the capacitor voltage unbalance problem caused by leakage current of main circuit. This paper proposed a kind of voltage balance circuit and a kind of suitable NPC three-level insulated-gate bipolar transistor (IGBT) power unit double pulse test method and expounded on the open process and theoretical basis of the NPC three-level power unit double pulse. The experimental result verifies the correctness and feasibility of this method.
            Key words: neutral point clamped three-level; snubbed circuit; double pulse test

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