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高频变压器计算

2009-04-17 15:22:44| 分类：【电感器件】 | 标签： |举报 |字号大中小订阅

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1. 已知参数:  (1) 输入电压 Vin   Vin(max)   Vin(min)
(2)输出电压Vout
(3)l输出功率:Pout
(4)电源效率:η
(5)开关频率: Fs(t)
(6)占空比:  Dmax
(7)线路主开关管的耐压:V mos
2. 计算,
Vf=Vmos-Vin(max)dc-150   ; Vf 电感储能电压,150为余留的余量电压.
Np/Ns=Vf/Vout
Vin(min)dc * Dmax=Vf*(1-Dmax)
1/2(Ip1+Ip2)*Dmax*Vin(max)dc =Pout/η  ;Ip1为开关导通原边电流,Ip2为关断时电流.
一般工作在连续模式: 必须 Ip2=3Ip1
3,原边电感量:
Lp=Dmax*Vin(max)dc/ Fs *ΔIp
Δip=Ip2-Ip1=2Ip1
AwAe=(Lp*Ip22*104/Bw*Ko*Kj)1.14

公式2:
Lp=η*(Umin*Dmax)2  / (2*Po*f)
Ip=2*Po / (η*Umin*Dmax)
Is=1.3Ip
S=0.15√pm―
W=1/2(Is+L2 )
Np=2*108  W / (Bm * S *Is)
Ns=Np*(Vo+Vd)Dmax /Umin*(1-Dmax)

公式3:
K=Uimax/Uimin
Dmin=Dmax / [(1-Dmax)k + Dmax]
Ip=2Po / ( Uimin*Dmax)

Lp=Uimin*Dmax / (Ip*f)
Bmax=B/2
Np=Lp*Ip*104 /(Al*Bmax)
Ns=  N1(Uo+Ud)(1-Dmax)/ (Uimin*Dmax)

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