一種三電平功率單元試驗方法研究 

周志華 
(湘潭電機股份有限公司，湖南 湘潭 411101) 
 

摘 要：介紹了二極管中點箝位型(NPC) 三電平功率單元的特點及吸收電路，分析了由于主電路漏電流的不同引起電容電壓不平衡的問題，提出了一種電壓均衡電路及一種適用于NPC 三電平絕緣柵雙極晶體管(IGBT) 功率單元雙脈沖測試方法，并闡述了NPC 三電平功率單元雙脈沖開通過程和理論依據，試驗驗證了該方法的正確性及可行性。
關鍵詞：中點箝位型三電平；吸收電路；雙脈沖測試
中圖分類號：TM461 文獻標識碼：A 文章編號：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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