MOTOROLA MVME187-002B 88100 25MHZ SINGLE RISC CPU WITH 8MB PARITY MEMORY, 32KB
逆变器感应电机系统EMI测试示意。2IGT的开通/关断波形与接地电流的联系IGT的开关特性（这里只关注dv/dO由许多因素决定，如直流母线电压、负载电流、门驱动阻抗、结温、以及电路的寄生阻抗等。
本文详细研究了IGB开关动作时电压上升/下降速率（ldv/dd）和负载电流之间的联系。所示逆变器个桥臂上的器件电压和负载电流/的波形如所示，。为了测量方便，逆变器通过根很短的粗铜线连接到接地面。图中曲线3所示电压波形是个逆变器桥臂的输出，这是由上管开关动作产生的，曲线所示电流波形是电机侧的接地电流，曲线2所示电流波形是流回逆变器侧的接地电流。
很明显，接地电流在IGT开关动作时产生，Idv/dfl越大，接地电流也越大；大部分接地电流从电机侧流出并从逆变器侧返回，其余部分则流入电网侧，接地电流能通过接地网络耦合其他装置产生严重干扰。
图中纵坐标电压为250V/：洛：电流为2A/格：横坐标时间为500ns/格。
IGB上管开通/关断动作所弓丨起的接地电流Fig.4Groundingcurrentdueto多，由接地电流所引起的EMI问题主要由IGB的开通动作决定，因而可以主要考虑IGT开通时的EMI问题。
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