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selecting capacitor for H-bridge inverter

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makeitwork

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hi all,
I'm trying to convert DC TO AC,the output being 3 level voltage. I know to select the capacitance,we have to use the formula C=Q/ΔV where ΔV is the allowable ripple voltage. However,i see an article where ΔV=εVdc while another is ΔV=2εVdc, can someone please confirm which is correct.Thanks.
 

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