IC693PBM200 在中電機(jī)驅(qū)動器中，處理器通常在超低電壓 （SELV） 電源域中運(yùn)行，以優(yōu)化性能。與提供給普通音頻設(shè)備或PC端口的電源類似，這些電壓和電流水平足夠低，因此不會被視為危險。不需要防止意外與人接觸的預(yù)防措施。通過這種方式，無需隔離即可輕松訪問處理器人機(jī)界面。然而，IGBT和電機(jī)相位通常在幾百伏或更高的電壓下工作，無論是相對于彼此還是相對于SELV功率域。因此，IGBT柵極、驅(qū)動器輸出以及為其供電的偏置電壓都是危險的。IGBT柵極電壓域和供電的SELV電源域之間需要隔離，并且需要域本身之間的功能隔離。偏置電源變壓器需要一個隔離式輸出繞組，每個隔離電源域至少需要兩個連接引腳。

IC693PBM200 除了電壓幅度外，考慮電機(jī)相位的共模壓擺率（電壓變化率或dV/dt）。圖2是演示板IGBT驅(qū)動電機(jī)相位切換的觀察結(jié)果。該測量顯示壓擺率為11 V/ns。偏置電壓取決于此共模電壓壓擺，并且不得受到其干擾。

IC693PBM200 

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