關(guān)于boost及buck-boost的紋波電壓

I read TI's AN SLVA059 & SLVA061. They discussed the ripple voltage during CCM and DCM. I found something is not right. In the application note, they only calcluate the Q during either D1 or D1+D3. They omit the capacitor discarging during D2. In my opinion, C>=Io*(1+D)^2/(4*f*u) for CCM and C>=Io*(1-sqrt(L/(2*R*Ts)))^2/(f*u) for DCM. Not like what they said, C>=Io*D/(f*u) for CCM and C>=Io*(1-sqrt(2*L/(R*Ts)))/(f*u) for DCM.

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ccps

LV.7

2011-02-16 07:25

做翻譯題練習(xí)英語：

我讀了TI的AN SLVA059 和 SLVA061文章。其討論了CCM與DCM模式下的紋波電壓。我發(fā)現(xiàn)有時候并不正確，文獻(xiàn)中只計算了 D1 或者 D1+D3時的Q.忽略了D2時的電容放電。在我看來，CCM模式下時C>=Io*(1+D)^2/(4*f*u) 且C>=Io*(1-sqrt(L/(2*R*Ts)))^2/(f*u).并不像他們所說C>=Io*D/(f*u) for CCM and C>=Io*(1-sqrt(2*L/(R*Ts)))/(f*u)

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