BENTLYNEVADA330104-00-04-10-02-00上图为下臂IGBT的触发端子开路时的情形。上电后，IGBT1因驱动电路的接入，负的截止电压加到G、E极上，能将其维持在可靠的截止状态。变频器运行信号的莽撞投入，使IGBT1受正向激励脉冲电压驱动而开通，U端子即IGBT2的C极马上跳变为+530V的直流高压，此跳变电压提供了Ccg、Cge两只电容的充电回流回路，在IGBT1开通期间，IGBT2也为此充电电流所驱动，而近于同时开通，两管的共通形成了对P、N端的+530V供电电源的短路，啪啦一声，两只管子都炸掉了！假如上管的信号端子是空置的，而下管接入了驱动电路，同样，下管的导通，也会因同样的原因使两管损坏。假定IGBT2的G、E极上，尚并联有栅极旁路电阻（如IGBT1栅控回路中的R旁），将对上述充电电流形成旁路作用，两管共通的可能性会降低一些。再假定在上管导通期间，下管的G、E极间有7V左右截止负压的存在，正向的充电电流为栅负偏压所中和和吸收，远远达不到使IGBT开通的幅值，则IGBT2是安全的。这也正是IGBT的控制回路为什么要加上负压的缘故。对于采用IPM智能化逆变模块的变频器，驱动供电往往为单电源，并未提供负压，又是嘛回事呢？从设计上的要求，IGBT驱动信号的引线越短越好，以降低引线电感效应；IGBT的E、E极间应有有小的电阻回路，以充分旁路干扰信号电流。而IPM模块，驱动电路与逆变主电路都集成于模块内部，驱动电路与IGBT之间配线极短，据资料称，甚至省掉的栅极电阻，以降低配线阻抗。IGBT在关断状态下，保障栅极处于低阻抗接地状态，从而有效防止了由干扰信号造成的误导通，因而省掉了负电源供电。GECIRCUITBOARD44B398603-001/4?4A397805-G02*USED*NACHIDSS-G04-A3X-AR-?D2-21*USED*3DINSTRUMENTS25504-45U55SBD*NEWOUTOFBOX****C00-00911/6X2250PSI*USED*MINEBEACO.LTD.3100NL-05W-B59*USED*ELONCOLLEGEFFG2002T1A95VALVE*USED*LOTOF3PHOTOSWITCH8-530PLUG-INMODULE*USED*LOTOF2A.A.ELECTRICAAE-D204-M*USED*PROPORTION-AIR50.978.3.1.1PRESSURECONTROLVALVE*USE...FESTOC***NU-25-120-P?-A*NEWOUTOFABOX*SUPERIORELECTRICSTEPPINGMOTORMO93-LF08*NICE*SPORLANKT-83-VCP1005'ELEMENTTHERMOSTATICEXPANSION...BIMBA172-DP*USED*GEMOTORRUNCAPACITOR97F9607*NEWINBOX*GENERALELECTRICIC3603A177AH2*USED*JEWETTDTPM1001-1BTEMPERATUREPOWERMONITOR*USED*LOTOF4ITTMS3476L14-4P*NEWOUTOFABOX**NEWOUTOF...ELECTROMATICSB165120*USED*SUNXPS-830-SACONTROLUNIT*USED*SYRONDTC1400-01*USED*MODICON110CPU51203*USED*KELLEMS074-01-023*USED*FANUCA06B-0522-B031*USED*DYNAMATIC5-493-600*USED*EMERSON1074-151*USED*ALLENBRADLEYTRANSFORMERX-210922TYPE3AH*USED*DWYER3220-HP*USED*ALLENBRADLEY937-A4SER.A(ASPICTURED)*USED*LONGFORD222-676-88*NICE*LONGFORDINTERNATIONALM1002-1*NICE*LOTOF277022-002*USED*ALLENBRADLEY592-DOV16SERIESB*USED*ARROWHARTLL-032*NICE*ALLENBRADLEY50906POWERBOARD*USED*REULANDXBCA-H16Z20-B77?0*USED*LOTOF2MODICONAS-J810-000*NICE*AMSTRONGB394BSTREAMSTRAP*USED*PARKERVALVET2002JH2F01*NICE*ALLENBRADLEY3A16550V*USED*AROA212-SD-000-N*USED*PARKER530931000*USED*HONEYWELLFE7B-FDD6-M*USED*GENERIC0104024B*USED*GENERIC0104024A*USED*EATON1250B-6501*USED*THERMOSWITCH17800-529*USED*LOTOF3STRICKLANDINC.101A100F11BC099PROCONPUMP*...MASTERPNEUMATICDETROITINC.CFR55-1L15*USED*ASHCROFT451279SSL04L15#DURAGAUGESOLIDFRONT*USED*ELEXONPOWERSYSTEMOLV15-15POWERSUPPLY15V,1.2A*USE...ETLIN-DANIELSFP-108C-S1-BFAN*USED*LOTOF2TOL-O-MATIC25201017BASE,2.0"STK*NEWOUTOF...TECHNOELECTRICSD2-125-RRSWITCH*NEWINABOX*ALLENBRADLEY140-MN-1000SERIESC*USED*WARNERELECTRICSF-50Q*NEWINABOX*CUSTOMCONTROLSENSORS,INC.604PA21*NEWOUTOFBOX*MICROSWITCHEXD-AR-3*NEWINBOX*LOTOF42AUTOMATIONDIRECTDN-M10B*NEWINABOX*IDECPS5R-E24POWERSUPPLY*NEWINABOX*GEFANUCIC610MDL105A*USED*GEFANUCIC610CPU105A*USED*EG&GROTRONFANSU2B5*USED*IDECISF-R05MTU*USED*SQUARED8501-DO-20SERIESC*USED*UNITEDELECTRICB5-108TEMPERATURECONTROL*USED*KLOCKNERMOELLERTO-3-8233/EZ*NEW*LOTOF2ACTIONPAK7010-172RELAY*USED*PARKERZETA57-102-MOMOTOR*NEWINABOX*DANFOSSEN60947-4/-5*USED*WORCESTER4466RTSEVALVE*USED*OKUMABLIV-D100A*USED*LOTOF6STOCKHAMFIG.B1451/4"*USED*NORGRENN71DA01-NS5-NE2*USED*PARKER10-S-74W-M-3-ZC?ZC-1-78*USED*NO***ONWIRINGHARNESSKIT*NEWOUTOFABOX*HONEYWELLCB817-004436AIRPRESSURESWITCH*NEWINBOX*ALLENBRADLEY42MTB-5000SERIESB*NEWINABOX*ELECTROCAMPS-5275-11-ADR*NEWINBOX*YASKAWACIMR-F7U4075*NEWNOBOX*PCBLOADCELL203M22*NEW*A06B-6110-K801*NEWOUTOFABOX*ALLENBRADLEY871C-J15B30SER.A*USED*TELEMECANIQUEXS1L06PA340LD15*USED*CARLOG***AZZICA18CLF08NAPROXIMITYSENSOR*USED*LOTOF2ALLENBRADLEY140-MN-0240SER.B*USED*ALLENBRADLEY802T-HPSER.FLIMITSWITCH*USED*TELEMECANIQUEXU2-P18PP340D-R*USED*LOTOF3BRADHARRISON703000D02F120*USED*ALLENBRADLEY440E-A17112SERIESB*NEWINBAG*LOTOF50AUTO-VEHICLEPARTSCO.15677EXTRODEDUNUTS...SENTROL*USED*ROSEMOUNT0444RL2U1AXXX1NA*USED*DOVERPRD-60399*USED*RP&CEF56D*USED*FIRECYCLEDETECTOR04625-B*USED*PEPPERL+FUCHSKFD2-SD-EX1.48SOLENOIDDRIVES*NEWIN...LOTOF2GENERALELECTRICCONTROLRELAYCR2790E100CA*U...HONEYWELLPRINTHEADGEARKITDPR300046182899-501*NEW...WEIDMULLERFANOUTBOARD996884*NEW*VICKERSCOIL02-101731*NEWINBOX*LEVITON000-09882*NEWINAFACTORYBAG*BRYANT7102NLOCKINGPLUG*NEWINABOX*NO***ONNON-HEATEDINLINEFILTERS274288B*NEWINABOX...MYTECHMP-SAPOWERPACKSL***E*NEW*ACRISON700-0321MD2WEIGHFEEDERCONTROLLER*NEWNOBO...SONAXHORNSPEAKERSP-15*NEW*XYCOM4117TPANELVIEW4117-0000000002?001*NEW*DOLAN-JENNERINDUSTRIESINC.180*NEWINABOX*PARKERN1620SHYDRAULICVALVE*NEW*MACVALVEINC.1111A-037PUSHBUTTONOPERATION*USED*HEVIDUTYD47114TRANSFORMER*USED*TURCKBi10-G30-AN6X*USED*ALLENBRADLEY193BSB22SER.B*USED*ALLENBRADLEY193-EA1EBSERIESB*USED*FESTOMX-2-3/8*USED*BALLUFFBES516-207-BO-E-03*NICE*REDLIONPRS11011*USED*EUPECR55-01-017*USED*FESTOD5NU-20-10P-A*USED*BALLUFFBES516-420-B0-L*USED*SPRECHER+SCHUHCEP7-A32*USED*SIEMENS3RV1021-1HA10*USED*A.P.W.COMINC.4692*USED*OMRONE2E-X10ME1-M1*USED*)