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1、VinC2 L1 Q2 C3 Q1 T1 Q3 Q4 L2 C4 + - + - C1 Voset NpNs Vinmin32Vinmax60 Vo5 Io10 fs300 103 Ts 1 fs Dmax0.55 T1 Select EE12.5 CORE: Le=26.4*10-3 Ae=12.2*10-6 Ve=4347*10-9 Ae12.2 10 6 Le26.4 10 3 B0.3 r0.5 1. Transformer design n Dmax Vinmin Vo 3.52 Np Vinmin DmaxTs B Ae 16.029 Let Np16 Lp300 10 6 Ns
2、Np n 4.545 Ns5 n Np Ns 3.2 D Vin() n Vo Vin 405060 0.2 0.3 0.4 0.5 D Vin() Vin B Vin() Vin D Vin()Ts Np Ae 405060 0.2728 0.273 0.2732 0.2734 0.2736 B Vin() Vin 2 L2 design Lf Vin() Vo 1D Vin()()Ts r Io 405060 1.6 10 6 1.8 10 6 2 10 6 2.2 10 6 2.4 10 6 2.6 10 6 Lf Vin() Vin Lf Vinmax()2.44410 6 Let L
3、f2.6 10 6 r Vin() Vo 1D Vin()()Ts Lf Io 405060 0.3 0.35 0.4 0.45 0.5 r Vin() Vin I Vin()r Vin() Io 405060 3 3.5 4 4.5 5 I Vin() Vin 3 Clamp Voltage design When 0tDTVclamp1 Vin()Vin When DTtTVclamp2 Vin() Vin D Vin() 1D Vin()() 405060 30 40 50 60 Vclamp1 Vin() Vin 405060 20 25 30 35 Vclamp2 Vin() Vin
4、 4 Transformer and Inductor Current Calculation When 0tDT Isec1 Vin t ()Io I Vin() 2 I Vin() D Vin() Ts t Iclamp1 Vin t () Vclamp1 Vin() Lp t D Vin() Ts 2 Ipri1 Vin t () Isec1 Vin t () n Iclamp1 Vin t () When DTtT Isec2 Vin t ()Io I Vin() 2 I Vin() 1D Vin()()Ts tTs() Iclamp2 Vin t () Vclamp2 Vin() L
5、p t 1D Vin()()Ts 2 Ipri2 Vin t ()Iclamp2 Vin t () 5 Mosfet Select and loss Calculation 5.1 design primary mosfet Q1 VdsQ1 Vin()Vclamp2 Vin()Vin 405060 60 65 70 75 80 85 VdsQ1 Vin() Vin VdsQ1 Vinmax()81.818 select FDMC86102L VdsQ1100RdsQ10.024QgQ113 10 9 Coss175 10 12 VgQ110 IrmsQ1 Vin() 0 D Vin() Ts
6、 tIpri1 Vin t ()2 d Ts PconQ1 Vin()IrmsQ1 Vin()2RdsQ1 405060 1.6 1.8 2 2.2 2.4 IrmsQ1 Vin() Vin 405060 0.06 0.08 0.1 0.12 PconQ1 Vin() Vin PconQ1 Vinmin()0.119 PgateQ1 Vin()QgQ1 VgQ1fs 5.2 Design Clamp Mosfet Q2 VdsQ2 Vin()Vclamp2 Vin()Vin 405060 60 65 70 75 80 85 VdsQ2 Vin() Vin select SI7119 VdsQ2
7、200RdsQ20.85QgQ216.2 10 9 VgQ210 IrmsQ2 Vin() D Vin() Ts Ts tIpri2 Vin t ()2 d Ts PconQ2 Vin()IrmsQ2 Vin()2RdsQ2 405060 0.036 0.038 0.04 0.042 0.044 IrmsQ2 Vin() Vin 405060 1 10 3 1.2 10 3 1.4 10 3 1.6 10 3 1.8 10 3 PconQ2 Vin() Vin PgateQ2 Vin()QgQ2 VgQ2fs 5.3 Secondary Q3 design VdsQ3 Vin() Vclamp
8、2 Vin() n 405060 6 7 8 9 10 VdsQ3 Vin() Vin select IRFH7934TRPBF VdsQ330RdsQ33.5 10 3 QgQ320 10 9 VgQ37 IrmsQ3 Vin() 0 D Vin() Ts tIsec1 Vin t ()2 d Ts PconQ3 Vin()IrmsQ3 Vin()2RdsQ3 405060 5 5.5 6 6.5 7 7.5 IrmsQ3 Vin() Vin 405060 0.08 0.1 0.12 0.14 0.16 0.18 PconQ3 Vin() Vin PgateQ3 Vin()QgQ3 VgQ3
9、fs 5.4 Secondary Q4 design VdsQ4 Vin() Vclamp1 Vin() n 405060 10 12 14 16 18 20 VdsQ4 Vin() Vin select IRFH7934TRPBF VdsQ430RdsQ43.5 10 3 QgQ420 10 9 VgQ47 IrmsQ4 Vin() D Vin() Ts Ts tIsec2 Vin t ()2 d Ts PconQ4 Vin()IrmsQ4 Vin()2RdsQ4 405060 7 7.5 8 8.5 9 IrmsQ4 Vin() Vin 405060 0.16 0.18 0.2 0.22
10、0.24 0.26 0.28 PconQ4 Vin() Vin PgateQ4 Vin()QgQ4 VgQ4fs 6 T1 loss and cope loss calculation 6.1 core loss calculation VeAe Le3.22110 7 B Vinmin()0.273 look up table of Pv of core Pv800mw / cm3 PlossT1Ve Pv1030.258 2 cope wire loss calculation Primary Select No.30 wire double roll dpriwire0.254 10 3
11、 cu17 10 9 Npriwire16 Wframe4.5() 10 3 With of Frame , add 0.5mm because the primary weding plate surfaceHframe6.7() 10 3 LpriwireNpriwire 2 Wframe0.5 10 3 2 Hframe0.5 10 3 Rpriwiresingle 4 Lpriwirecu 3.14 dpriwire2 Rpriwire Rpriwiresingle 2 0.066 Irmspriwire Vin() 0 D Vin() Ts tIpri1 Vin t ()2 d D
12、Vin() Ts Ts tIpri2 Vin t ()2 d Ts Pconspriwire Vin()Irmspriwire Vin()2Rpriwire Pconspriwire Vinmin()0.324 Secondary Select No.20 wire, double roll dsecwire0.254 10 3 cu17 10 9 Nsecwire5 LsecwireNsecwire 2 Wframe2 Hframe() Rsecwiresingle 4 Lsecwirecu 3.14 dsecwire2 Rsecwire Rsecwiresingle 2 0.019 Irm
13、ssecwire Vin() 0 D Vin() Ts tIsec1 Vin t ()2 d Ts Pconssecwire Vin()Irmssecwire Vin()2Rsecwire Pconssecwire Vinmin()0.948 7 Current resistor loss Rrs10 10 3 Prs Vin()IrmsQ1 Vin() Rrs 8 IC loss Vic10Iic0.01 Pic Vin()Vic Iic Total loss calculation Pmoscontotal Vin()PconQ1 Vin()PconQ2 Vin()PconQ3 Vin()
14、PconQ4 Vin() Pgatetotal Vin()PgateQ1 Vin()PgateQ2 Vin()PgateQ3 Vin()PgateQ4 Vin() Pwire Vin()Pconspriwire Vin()Pconssecwire Vin() Ptotal Vin()Pmoscontotal Vin()Pgatetotal Vin()Pwire Vin()Pic Vin()Pic Vin() 405060 1.4 1.6 1.8 2 2.2 Ptotal Vin() Vin eff Vin() Io Vo Io VoPtotal Vin() 405060 0.955 0.96 0.965 0.97 0.975 eff Vin() Vin