变压器手册中铁芯结构常数的计算

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EI型 cm5cmcm2280.011024.910.86300.017295.731.1330.031616.751.18350.023576.631.02400.056757.721.49440.115248.711.92490.074676.952.37500.169879.452.3600.2603711.12.45700.7927713.43.93磁芯规格结构常数磁路长度截面积52EE型 cmcmcm12.50.000172.960.1212.80.000352.880.19160.000533.740.19190.000813.970.22200.0014.620.32250.005965.770.52290.009517.020.57320.020737.410.84330.027456.771.11350.053210.51.000.081379.711.47410.062037.731.20.119459.631.72A0.185639.412.3440.11158.561.88500.168429.512.27550.3211.83.47600.2614112.45磁芯规格磁芯体积cm34.246.3286.7511.516.716.521.727.152.5磁芯体积3cm0.360.0.730.881.47346.197.521114.312.41721.615.921.0.827.1反激直流功率50K /△T:22.753.380.173.5109168122218312593反激直流功率50K /△T:2.355.878.2910.817.633.947.769.575.3140159115191233171222465314反激直流功率50K /△T:25EC型25S2828L30S3535S35L结构常数磁路长度截面积磁芯体积 cm5cmcm2cm30.0035.910.452.190.016336.570.5.840.019367.610.876.650.017465.921.187.010.021187.720.86.470.029886.991.158.010.034999.1719.1425.35867.953.47882.911040S40L41424950520.061010.083120.049490.125590.153010.152570.247140.1348.059.858.9.9910.99.4211.110.41.611.521.212.041.952.32.361.791314.910.920.421.321.626.118.6磁芯体积cm37.6511.718.225114167127192230206322248反激直流功率50K /△T:25磁芯规格结构常数磁路长度截面积ETD型 cm5cmcm2340.029087.870.97390.059019.291.240.1250610.41.790.2127311.62.1588.8139213291