反激式紋波電流系數怎么設定?
反激電源,在CCM模式和DCM模式下,電流紋波系數r怎么設定阿？都是0.4么？
全部回復(5)
正序查看
倒序查看
@rj44444
對于連續模式的，取0.4左右可以，進入斷續模式，就大于1了
Designing The inductance of the transformer primary side Lm:
Lm= (Vdc min * Dmax)square / (2 Pin * Fs * Krf)
Where Lm- primary inductance
F s- switching frequency
Krf- ripple factor in full load & min input voltage.
Key rule:
For discontinuous mode , set krf =1
For continuous mode, set kef < 1
If you are making flyback converter to be operated in CCM mode, just prefer to set krf between 0.25 – 0.5 for universal input range & krf = 0.4 – 0.8 for European input range.
這個是老外寫的資料,是大于1還是等于1阿?
0
回復
@f2812
DesigningTheinductanceofthetransformerprimarysideLm: Lm=(Vdcmin*Dmax)square/(2Pin*Fs*Krf) WhereLm-primaryinductanceFs-switchingfrequencyKrf-ripplefactorinfullload&mininputvoltage. Keyrule:Fordiscontinuousmode,setkrf=1Forcontinuousmode,setkef<1IfyouaremakingflybackconvertertobeoperatedinCCMmode,justprefertosetkrfbetween0.25–0.5foruniversalinputrange&krf=0.4–0.8forEuropeaninputrange.這個是老外寫的資料,是大于1還是等于1阿?
這個反激初級(儲能時)電流系數，公式應為: Kp=(Iph-Ipl)/(Iph+Ipl), 0
Kp還有一個比較算單的取法公式: Kp=Ipl/Iph, 0<=Kp<1, Kp=0時為DCM, Kp<1時為連續CCM，但是不便于套用計算變壓器。
0
回復
