1、ERUinUoutR1ICIDLEDPhototransistorSchematic of an optocouplerItIMt1t2t3t4Ideal gate current pulse waveform for thyristorsTMR1R2R3V1V2VD1VD3VD2R4+E1+E2Input fromcontrol circuitOttOuGiG50kHz50VGTON1N2N3C1C3C4C2R1R2R3R4V1V3V2LVD1VD2VD3VD413ErrorindicatingSensingVCCInterfacecircuitTurn-offcircuitTimer an
2、dreset circuitDetectioncircuit415861413uoVEE81546-10V+15V30V+5VM57962L14ui1Fast recovery diodetrr 0.2s4.7k3.1100F100FS图1-34FRVRCDTDCUMRC1RC2RC3RC4LBSDCRiVDLVTurn-onsnubberTurn-offsnubberLiVDiRsCsVDstuCEiCOwithout turn-on snubberwith turn-on snubberwith turn-offsnubberwithout turn-off snubberuCEiCADCBwithout turn-off snubberwith turn-off snubber图1-39uCEiCOSwitching trajectoryLTurn-offsnubberLTurn-offsnubberLoadLoadEdRsCsEdRsCsVDsb)a)图1-41RCRCVT1VT2RPRPIOUUT1IRUT2VT1VT2
