有源箝位反激变换器分析与设计

2012-01-1018:30:381.(Flyback)/[1]RCDLCD122.12[2]LmLr()TCrSSC3t=t0t1t0SSCDcDLmLrt=t1t2t1SCrSuDSt=t2t3t2uDSUi+uCDCLrLmuCUo(N1/N2)CCCCCr,u1u1=-uCLm/(Lr+Lm)t=t3t4t3u1Du1-Uo(N1/N2)LrCCLruC-Uo(N1/N2)iC[uC-Uo(N1/N2)]/LriCSCSC(ZVS)t=t4t5t4SCLrCrCru1-Uo(N1/N2)t=t5t6t5uDS=0LrCrSDsLrUi+Uo(N1/N2)Di2(LmLr)(1)t6t7t6SZVSiLri2t7iLriLmi2=0Du1-Uo(N1/N2)UiLmLrPWMSZVSt5t6iLrLrCrSZVSSSCLrCr(2)SCLrCrCr(3)CcCcCrLrZVSLrDD3.3.1LmLmCCM/DCMCCM(4)PominFsDS3.2LrSSSC(5)LrLrSDD(3)(7)Isp(8)UCrLr(8)ULrUi+(N1/N2)UoSZVSLr(9)iLriSiC3.3CcCcCcLrS(11)Lr(12)3.4Sc(5)11SciCSScDc1-DTS/2DcSc3.5DDUiN2/N1+UOCCMDDCMIDp(16)D3.6CfCf4.Ui=1832VDCUo/Io=+15V/1.0A-15V/0.2A+5V/0.4A20WFS=300KHzDmax=0.6=78.5%Pomin=1/6PomaxLm=52.3Lr=2Cc=0.47Cf=100SScIRF530+15V-15V+5VSR5061N58191N5819UC3843PWMUi=27V44(a)4(a)(b)ZVS4(f)di/dt25.ZVS