selection of value of X-Capacitors

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  • iamakda
    Member
    • Mar 2012
    • 46
    • Denmark
    #1

    selection of value of X-Capacitors

    Dear All,
    I have a question regarding the selection of value of X-Capacitors that are used in Differential Mode Filters (EMI Filters).
    I have an Isolated Full Bridge DC DC Boost Converter of 3KW for which I have do design a input Differential Mode Filter. The inductor just after the dc source has a dc current of 100A over which a 40A (peak-to-peak) inductor ac current is superimposed which means that triangular current waveform of 40A (pk-to-pk). Vi=30 V.
    I have determined the corner frequency of LC Low pass filter as 90KHz.
    My first question is how can I calculate the Peak to Peak ripple voltage(out of the above defined current waveform of inductor) which a X-Capacitor must withstand?
    Second question is what value of X-capacitor shall I choose that can withstand the amount of ripple voltage that has been calculated in the first question I asked above?
    Your suggestions and help will be highly appreciated. I have also attached a picture for your convenience.
    Thanks.
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