变压器手册中铁芯结构常数计算

单端式开关电源 Y=

Pin2*Dmax2*Z 0.45*Bm2*F2*q0.714

双极性开关电源 Y=

Pt2*Dmax3*Z 1.78*Bm2*F2*q0.714

Pin：输入功率

Pt:：视在功率计算公式见表一：

表一变换器形式 全波整流全桥式Pt=Po*(1/η+ 2)半桥式Pt=Po*(1/η+ 2)推挽式Pt=Po*( 2/η+ 2) 桥式整流Pt=Po*(1/η+ 1)Pt=Po*(1/η+ 1)Pt=Po*( 2 /η+ 1)Z：铜耗因子 取值见表二 ：

234.5+T+△TT：环境温度

Z=1.96X

234.5+T△T：变压器温升

Bm：工作磁感应强度 0.12--0.25T 与输出功率和频率成反比q：单位散热表面功耗 （w/cm2) 取值见表二：表二：变压器温升环境温度℃℃Z2.132.112.102.212.192.172.292.262.242.382.342.3020202030303040404050505002550025500255002550qw0.010.020.0250.030.0350.040.0350.040.0450.050.060.07表三：磁芯结构参数表磁芯规格结构常数磁路长度截面积磁芯体积反激直流功率cm34.246.3286.7511.516.716.521.727.152.550K /△T:25EI型28303335404449506070 cm50.011020.017290.031610.023570.056750.115240.074670.169870.260370.79277cm4.915.736.756.637.728.716.959.4511.113.4cm20.861.11.181.021.491.922.372.32.453.9342.753.380.173.5109168122218312593磁芯规格结构常数磁路长度截面积EE型 cm5cmcm212.50.000172.960.1212.80.000352.880.19160.000533.740.19190.000813.970.22200.001894.620.32250.005965.770.52290.009517.020.57320.020737.410.84330.027456.771.11350.053210.51.05400.081379.711.47410.062037.731.6420.119459.631.7642A0.185639.412.3440.11158.561.88500.168429.512.27550.543211.83.47600.2614112.45磁芯规格结构常数磁路长度截面积EC型 cm5cmcm225S0.003564.910.45280.016336.570.8928L0.019367.610.8730S0.017465.921.18350.021187.720.835S0.029886.991.1535L0.034999.171磁芯体积反激直流功率cm350K /△T:250.364.350.545.870.738.290.8810.81.4717.6333.9447.76.1969.57.5275.31114014.315912.41151719121.623315.917121.622240.846527.1314磁芯体积反激直流功率cm350K /△T:252.1925.35.84586.6567.97.0153.46.47788.0182.99.1411040S40L4142454950520.061010.083120.049490.125590.153010.152570.247140.136448.059.858.989.9910.99.4211.110.41.611.521.212.041.952.32.361.791314.910.920.421.321.626.118.6114167127192230206322248磁芯规格结构常数磁路长度截面积ETD型 cm5cmcm2340.029087.870.97390.059019.291.26440.1250610.41.75490.2127311.62.15磁芯体积反激直流功率cm350K /△T:257.6588.811.713918.221325291