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反激变压器计算
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INPUT85--265VAC OUTPUT 12VDC/5A恒压 SI8016H--100KHZ
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IC供电16VDC
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1. 输出功率 Pout=Uout*Iout Pout= 12V*5=60W
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2.输入功率 Pin=Pout/η Pin=60W/90%=66.6W (η在这取90%)
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3.平均输入电流 Iav=Pin/Vin(min) Iav=66.6W/110V=0.6A
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4.输入电流峰值 Ipk=2Iav/(1+k)a=0.6*2/1.4*0.46A=1.86A (K常数取0.4)
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5.初级线直径 D=1.13* (Iav/j)的开根号 D=0.45MM (j取4)
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6.初级电感取值 Lp=Vin(min)*α占空/Ipk*f Lp=110V*0.46/119A*100KHz=0.425MH (a占空取0.46;f取100KHz)
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7.初级匝数Np=Vin(min)*Ton/2Bm*Ac*10(-2) N=110V*4.6/0.2*119=22T
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(Ton=a/f=0.46/100=4.6us;Bm取0.2T;Ae=119mm2)
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8.次级匝数N=N初(Vout+Vf)*(1-Dmax)/Vin(min)*αmax Ns=22T(12V+0.5V)*(1-0.46)/110V*0.46=3T 次级线直径1.2MM
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Nf=4T (IC供电设为16V) 次级线直径0.22MM
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变压器我们选用PQ2620,查资料PQ2620磁芯Ae:119mm平方
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