輸入電容的計算 Bulk -Capacitor V o = = = 12.000 V 2.000 A rated value rated value I o P o efficiency(η) = 24.000 W 75% auto value surppose value P in = = = = 32.000 W 90.000 V auto value V in rated min value auto value V DC * 90.000 1.2 = 108 I DC 0.296 A 50.000 Hz auto value input f = rated value T t = ΔV = cycle = 0.020 s 0.010 s auto value by input frequency surppose value value 40.000 V 一般取30或40V C bulk = I DC *t/ΔV = 7.407E-05 F I ripple = 1.8*I DC = 0.533 A 左右.可適當減小一些. V 適當減小一些.