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    1. Flyback????????????

    2. ??????

    4. ?????Np?Ns?Lp??? 1?????Np Vin=Np*(?f/?t)=Np*(?BAe/Ton) =»Np=VinTon/?BAe ????(1) ?B?0.65Bs(??Bs???0.5T) =»?B=0.32T Vin???????? Ton=dmax*T

    5. 2.???? ?????????????????????? VinTon/Np=VsToff/Ns =» Ns=(VsToff/VinTon)*Np =[Vs (1-dmax)/Vindmax]*Np ……(2)

    6. 3.?????Lp ????????? ?????? Vin=Lp*(Ipmax/Ton)……(3) => Lp=VinTon/Ipmax …… (4) ? Pin=1/2LpIpmax^2* f =1/2(VinTon)Ipmax*f => Ipmax=2Pin/VinTon*f ……(5)

    7. ?(5)??(4) Lp=(VinTon)^2*f/2Pin =Vin^2*T^2*dmax^2*f/2P =Vin^2*dmax^2/(2Pin*f) =?Vin^2*dmax^2/(2Po*f) ………(6)

    8. ???????????Lg 1/2Lp*Ipmax^2=1/2?B*H*Vg (Vg?????=Lg*Ae) ??:µ?*H=?B/0.4p???µ?=1 => H=?B/0.4p ……(7) ?(7)????: Lp*Ipmax^2=?B^2AeLg/0.4p => Lg=0.4pLp*Ipmax^2/(Ae?B)……(8)

    9. ?????Vce?Ic???(???) Vce=Vin+nVs (n=Np/Ns)……(9) ?(2)???Vs=(1/n)*[Vindmax/(1-dmax)] =>Vce=Vin+Vindmax/(1-dmax) =Vin/(1-dmax) …… (10) ?(5)?:Ic=Ipmax=2Po/?Vindmax…(11) ???Icrms=(Ton/3T)^1/2*Ipmax =(dmax/3)^1/2*Ipmax ?dmax=0.4 => Icrms=0.37*Ipmax

    10. ?.???????Id?Vd??? Id=Ismax=n*Ipmax ??????,?????????????????????Io,???????Id?Io????

    11. ???

    12. ???: Io=1/2*Ismax*toff =>Ismax=2Io/(1-dmax) =>Id=Ismax=2Io/(1-dmax) …… (14) Vd=Vo+Vin/n ……(15) ??:Ipmax???Io??? Ipmax=Id/n=2Io/(1-dmax)*(1/n) ……(16)

    13. ????????????Ipmax????????????Ismax??

    14. Ipmax=(N2/N1)*Io/[(1-dmax)]+ (Vin /2 LpF)dmax ……(17) VinTon=Lp(Ipmax-Ipmin) =>Ipmax=VinTon/Lp+Ipmin ……(18) ½(Ismax+Ismin)Toff=IoT Ismax+Ismin=2IoT/Toff=2Io/(1- dmax)……(19) VsToff=L2(Ismax-Ismin) VsToff/N2=VinTon/N1 =>Ismax-Ismin=(VinTon/L2)*(N2/N1) ?Lp/L2=N1^2/N2^2 =>Ismax-Ismin=(VinTon/Lp)*(N1/N2) ……(20)

    15. (19)-(20)??: Ismin=Io/(1- dmax)- (VinTon/2Lp)*(N1/N2) …… (21) Ipmin=Ismin*N2/N1=(N2/N1)*Io/(1- dmax)- VinTon/2Lp ……(22) ?(22)??(18): Ipmax=VinTon/Lp+{(N2/N1)*[Io/(1- dmax)]- Vin/2Lp} =(N2/N1)*[Io/(1- dmax)]+VinTon/2LpF =(N2/N1)*[Io/(1- dmax)]+Vin dmax/2LpF ????????Id=Ismax=N1Ipmax/N1 =1/(1- dmax)*Io+(Vin dmax/2LpF)*(N2/N1) ……(23)

    16. Flyback???????? ??????C?????Ic=I2- Io ??:I2??????? Ic??????????: Icrms=[Ton/3T(I2p^2-I2pIo+Io^2 )+(Toff/T)* Io^2]^1/2 ??I2p=2io/(1- dmax) ???????????????????

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