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    #1

    Differential Mode Filter Design

    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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    #2
    Re: Differential Mode Filter Design

    iamakda, your question is definitely well over my head. I'm thinking that the capacitor ripple current capability might be critical as well.
    PeteS in CA

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      #3
      Re: Differential Mode Filter Design

      ok if we think in terms of capacitor's ripple current, then what would be the ripple current which will pass through this x-capacitor? how i can calculate this ripple current and then what value of x-capacitor should I use?
      Last edited by iamakda; 03-01-2012, 08:50 AM.

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        #4
        Re: Differential Mode Filter Design

        Originally posted by PeteS in CA View Post
        iamakda, your question is definitely well over my head. I'm thinking that the capacitor ripple current capability might be critical as well.
        Dear PeteS,

        Please advice how can I calculate the value of X-Capacitor from scratch in order to design a Differential Mode Filter? Just to remind you I have found the cutoff freq. of filter is as 90KHz.

        Kindly help me out as I do not have any idea about it. Guide me please.

        I hope to hear from you.

        Thanks,
        Ishtiyaq

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