反激式紋波電流系數(shù)怎么設(shè)定?
反激電源,在CCM模式和DCM模式下,電流紋波系數(shù)r怎么設(shè)定阿？都是0.4么？
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@rj44444
對(duì)于連續(xù)模式的，取0.4左右可以，進(jìn)入斷續(xù)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(gè)是老外寫的資料,是大于1還是等于1阿?
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@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(gè)是老外寫的資料,是大于1還是等于1阿?
這個(gè)反激初級(jí)(儲(chǔ)能時(shí))電流系數(shù)，公式應(yīng)為: Kp=(Iph-Ipl)/(Iph+Ipl), 0
Kp還有一個(gè)比較算單的取法公式: Kp=Ipl/Iph, 0<=Kp<1, Kp=0時(shí)為DCM, Kp<1時(shí)為連續(xù)CCM，但是不便于套用計(jì)算變壓器。
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