MOTOROLA MVME187-002B 88100 25MHZ SINGLE RISC CPU WITH 8MB PARITY MEMORY, 32KB
逆變器感應電機系統EMI測試示意。2IGT的開通/關斷波形與接地電流的聯系IGT的開關特性（這里只關注dv/dO由許多因素決定，如直流母線電壓、負載電流、門驅動阻抗、結溫、以及電路的寄生阻抗等。
本文詳細研究了IGB開關動作時電壓上升/下降速率（ldv/dd）和負載電流之間的聯系。所示逆變器個橋臂上的器件電壓和負載電流/的波形如所示，。為了測量方便，逆變器通過根很短的粗銅線連接到接地面。圖中曲線3所示電壓波形是個逆變器橋臂的輸出，這是由上管開關動作產生的，曲線所示電流波形是電機側的接地電流，曲線2所示電流波形是流回逆變器側的接地電流。
很明顯，接地電流在IGT開關動作時產生，Idv/dfl越大，接地電流也越大；大部分接地電流從電機側流出并從逆變器側返回，其余部分則流入電網側，接地電流能通過接地網絡耦合其他裝置產生嚴重干擾。
圖中縱坐標電壓為250V/：洛：電流為2A/格：橫坐標時間為500ns/格。
IGB上管開通/關斷動作所弓丨起的接地電流Fig.4Groundingcurrentdueto多，由接地電流所引起的EMI問題主要由IGB的開通動作決定，因而可以主要考慮IGT開通時的EMI問題。
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