MOTOROLA MVME187-002B 88100 25MHZ SINGLE RISC CPU WITH 8MB PARITY MEMORY, 32KB
逆變器感應(yīng)電機(jī)系統(tǒng)EMI測試示意。2IGT的開通/關(guān)斷波形與接地電流的聯(lián)系IGT的開關(guān)特性（這里只關(guān)注dv/dO由許多因素決定，如直流母線電壓、負(fù)載電流、門驅(qū)動阻抗、結(jié)溫、以及電路的寄生阻抗等。
本文詳細(xì)研究了IGB開關(guān)動作時電壓上升/下降速率（ldv/dd）和負(fù)載電流之間的聯(lián)系。所示逆變器個橋臂上的器件電壓和負(fù)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(guān)動作產(chǎn)生的，曲線所示電流波形是電機(jī)側(cè)的接地電流，曲線2所示電流波形是流回逆變器側(cè)的接地電流。
很明顯，接地電流在IGT開關(guān)動作時產(chǎn)生，Idv/dfl越大，接地電流也越大；大部分接地電流從電機(jī)側(cè)流出并從逆變器側(cè)返回，其余部分則流入電網(wǎng)側(cè)，接地電流能通過接地網(wǎng)絡(luò)耦合其他裝置產(chǎn)生嚴(yán)重干擾。
圖中縱坐標(biāo)電壓為250V/：洛：電流為2A/格：橫坐標(biāo)時間為500ns/格。
IGB上管開通/關(guān)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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