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NOTES FOR STABLE AND SAFE OPERATION ; ~ Design the PCB pattern to minimize wiring length between opto-coupler and IPM's input terminal, and also to minimize the stray capacity between the input and output wirings of opto-coupler. ~ Connect low impedance capacitor between the Vcc and GND terminal of each fast switching opto-coupler. ~ Fast switching opto-couplers: tPLH, tPHL " 0.8ffs, Use High CMR type. ~ Slow switching opto-coupler: CTR > 100% ~ Use 4 isolated control power supplies (VD). Also, care should be taken to minimize the instantaneous voltage charge of the power supply. ~ Make inductance of DC bus line as small as possible, and minimize surge voltage using snubber capacitor between P and N terminal. ~ Use line noise filter capacitor (ex. 4.7nF) between each input AC line and ground to reject common-mode noise from AC line and improve noise immunity of the system.
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