3.平均输入电流 Iav=Pin/Vin(min)Iav=26W/110V=0.236A4.输入电流峰值 Ipk=2Iav/(1+k)a=0.236*2/1.4*0.46A=0.732A(K常数取0.4)5.初级线直径D=1.13*(Iav/j)的开根号 D=0.28MM(j取4)6.初级电感取值 Lp=Vin(min)*α占空/Ipk*fLp=110V*0.46/0.732A*65KHz=1.0MH(a占空取0.46;f取65KHz)反激变压器计算INPUT85--265VACOUTPUT63VDC/0.35A恒流 LD7550--65KHZ要求工作温度尽量低 1.输出功率Pout=Uout*IoutPout=63V*0.35=22.05W2.输入功率 Pin=Pout/ηPin=22W/80%=26W(η在这取85%)IC供电20VDCNf=16T(IC供电设为20V)次级线直径0.18MM7.初级匝数Np=Vin(min)*Ton/2Bm*Ac*10(-2) N=110V*7.1/0.2*0.785=50T(Ton=a/f=0.46/65=7.1us;Bm取0.2T;Ac=0.785CM2)8.次级匝数N=N初(Vout+Vf)*(1-Dmax)/Vin(min)*αmaxNs=50T(63V+0.7V)*(1-0.46)/110V*0.46=34T次级线直径0.33MM刘财新2007.5.18.T