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DC/DCFAENAMECARY.CHENTAD1.DC/DC2.3.4.5.(Switch)(Diode)(Inductor)(Capacitor)(Transformer)+u(t)-i(t)dttduCti)(1)(=1.,,.CItU=CI+U-2.I+I-ABA=B+u(t)-i(t)dttdiLtu)()(=1.,,.2.,,LUtI=ULI+U-LItLIU∆=dttdiLtu)()(=u(t)i(t)V+V-t1t2LttVdttuLItt)()(10110−==∆++∫t0)()(1201ttVttV−=−−++∆I−∆I−+∆=∆IILttVdttuLItt)()(11221−==∆−−∫:.V+V-ABV+V-ABA=B1.(,)2.(,)3.4.dttduCti)(1)(=dttdiLtu)()(=TUIL**=∆TIUC**=∆C:L:VinVoLIoSDVinVoDLIoS1DS2VinVoDLIoSVo=Vin*D/(1-D)Vo=Vin*DVo=Vin/(1-D)VoVin,VoVin,VoVin,D0.5VoVinD0.5BUCKVinVoDLIoSSULILVin-Vo-VooI∆IoD1-DTL(Vin-Vo)*DT=Vo*(1-D)TVo=Vin*DL*Io=Vo*(1-D)TIsL1-DIo=Vo*(1-D)T/LBUCKUDILVinVDIsVinVoDLIoSIonIoff½VsatIpkIminBUCK00.10.20.30.40.50.60.70.80.9100.10.20.30.40.50.60.70.80.9110VoD()10DVo/Vin=DBOOSTVinVoLIoSSULILVinVo-VinD1-DTLVin*DT=(Vo-Vin)*(1-D)TIsDVo=Vin/(1-D)IDIoBOOSTSUSILVinVsatD1-DTVinVoLIoSDVfbk½½BOOST00.10.20.30.40.50.60.70.80.91012345678910101VoD()10DVo/Vin=1/(1-D)BUCK-BOOSTVinVoDLIoS1S1S2ULILVin-VooI∆IoD1-DTLVin*DT=(Vo+2Vd)*(1-D)TVo=Vin*D/(1-D)-2VdL*Io=(Vo-2Vd)(1-D)TVds1L(1-D)TIo=(Vo-2Vd)(1-D)T/LDS2Vds2VinVoBUCK-BOOST00.10.20.30.40.50.60.70.80.91012345678910VoD()DVo/Vin=D/(1-D)拓结率开关MOSFET率开关流VceoIcVdssIdVrIfBUCKVinIoutVinIoutVinIoutBOOSTVout2Pout/VinVout2Pout/VinVoutIoutBUCK-BOOSTVin-Vout2Pout/VinVin-Vout2Pout/VinVin-VoutIout,,,,1.,2.,3.,4.,5.TIUC**=∆TUIL**=∆
本文标题:DC-DC电源详解
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