以下观点是否正确?
1、负载功率因数会影响igbt的发热
2、载波频率提高,可以降低IGBT的发热,但可能会使输出变压器发热增加
3、使用软开关可以降低IGBT发热,但缓冲电路发热会增大
IGBT的发热问题请高手指点
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Sorry ,
1)item one is not correc, why ?
because that the power factor have nothing to do with the Power Switch. Reversely, the power switchc affects the PF．
2)item two is correct in part,why in fact the temperature riseing of IGBT resulted from the gate input Capacitor and D-S output capacitor and turn on resistor. the component of each part of this three changes with frequency. at low frequency the capacitor consuming is small, but at hf it is greater . while the turn on resistor is quite contray. of course you have to consider the driving power for the gate of IGBT, it must be enough high to let the G-S lead.
3)item three is correct, the cunbber net not only consumes energy also increase the cost. but you could use the loss free net work to optimize it.
1)item one is not correc, why ?
because that the power factor have nothing to do with the Power Switch. Reversely, the power switchc affects the PF．
2)item two is correct in part,why in fact the temperature riseing of IGBT resulted from the gate input Capacitor and D-S output capacitor and turn on resistor. the component of each part of this three changes with frequency. at low frequency the capacitor consuming is small, but at hf it is greater . while the turn on resistor is quite contray. of course you have to consider the driving power for the gate of IGBT, it must be enough high to let the G-S lead.
3)item three is correct, the cunbber net not only consumes energy also increase the cost. but you could use the loss free net work to optimize it.
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@keenfeng
Sorry, 1)itemoneisnotcorrec,why?because thatthepowerfactorhavenothingtodowiththePowerSwitch.Reversely,thepowerswitchcaffectsthePF． 2)itemtwoiscorrect inpart,why infactthetemperatureriseingofIGBTresultedfromthegateinputCapacitorandD-Soutputcapacitorandturnonresistor.thecomponentofeachpartofthisthreechangeswithfrequency.atlowfrequencythecapacitorconsumingissmall,butathfitisgreater.whiletheturnonresistorisquitecontray.ofcourse youhavetoconsiderthedrivingpower forthegateofIGBT,itmustbeenoughhightolettheG-Slead.3)itemthreeiscorrect,thecunbbernetnotonlyconsumesenergyalsoincreasethecost.butyoucouldusethelossfreenetworktooptimizeit.
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