采用電壓箝位控制實現(xiàn)串聯(lián)IGBT的動態(tài)均壓

IGBT 串聯(lián)應用時面臨的最大難題是動態(tài)均壓。本文研究了電壓箝位控制方法，它將IGBT 的集?射電壓變化快速反饋至門極，改變門極驅動電壓的大小，從而將集?射電壓實時箝位于控制閾值之內，實現(xiàn)串聯(lián)IGBT 的動態(tài)均壓。本文通過2 個和8 個IGBT 串聯(lián)的實驗，驗證了該方法的有效性。
Abstract: In the application of series-connected IGBTs, the biggest barrier to be conquered is dynamic voltage balancing. This paper investigates voltage clamping method. The changes of collector-emitter voltages of IGBTs are fed fast back to gates, which adjusts gate-driving voltages. Consequently, collector-emitter voltages are clamped within control thresholds and dynamic voltage balance of series-connected IGBTs is realized.
關鍵詞﹕電壓箝位控制，串聯(lián)IGBT，動態(tài)均壓
Keywords: Voltage clamping control, series-connected IGBTs, dynamic voltage balance