2、 整流桥引脚热阻假设整流桥焊接在PCB板上，其引脚的长度为12.0mm（从二极管的基铜板到PCB板上的焊盘）， 则整流桥一个引脚的热阻为： 　　在整流桥内部，四个二极管是分成两组且每组共用一个引脚铜板， 因此整流桥通过引脚散热的热阻为这两个引脚的并联热阻： 　　 一方面由于PCB板的热容比较大，另一方面冷却风与PCB板的接触面积较大， 其换热条件较好 QCA150A60 QCA150AA100 QCA150AA120 QCA150BA60 QCA200A60 QCA200AA100 QCA200AA120 QCA200BA60 QCA300BA60 QCB30A60 QCB50A60 QCB75A60 QBB100A60 QBB150A60 QAE75AA60 QF15AA60 QF30AA60 QF20AA60 QF50AA60 MQG100H100 三社整流桥 DF20DB80 DF20BA40 SEMIKRON（赛米控/西门康）IGBT，可控硅，整流桥模块 西门康IGBT SKM75GB128D SKM100GB128D SKM150GB128D SKM200GB128D SKM300GB128D SKM400GB128D SKM145GAL128D SKM300GAL128D SKM400GAL128D SKM300GA128D SKM75GB123D SKM100GB123D SKM150GB123D SKM200GB123D SKM300GB123D SKM400GB123D SKM75GAL123D SKM100GAR123D SKM300GA123D SKM75GD123D SKM75GB176D SKM100GB176D SKM200GB176D SKM400GB176D SKM200GAL176D SKM200GB126D SKM300GB126D SKM300GB126D SKM400GB126D SKM200GAL126D SKM100GB125DN SKM200GB125D SKM300GB125D SKM400GB125D SKM200GAL125D