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Phase-shifted resonant converter having reduced output ripple

  • US 6,970,366 B2
  • Filed: 04/03/2003
  • Issued: 11/29/2005
  • Est. Priority Date: 04/03/2003
  • Status: Expired due to Term
First Claim
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1. A power converter comprising:

  • a first resonant converter circuit including at least one power switch adapted to convey power to a first resonant circuit and a first rectification stage adapted to rectify said conveyed power from said first resonant circuit;

    a second resonant converter circuit including at least one power switch adapted to convey power to a second resonant circuit and a second rectification stage adapted to rectify said conveyed power from said second resonant circuit;

    a filter capacitor coupled to said first and second rectification stages to provide DC output power therefrom;

    a regulator operatively coupled to said first and second resonant converters to control switching frequency of said at least one power switch of each of said first and second resonant converters, such that switching frequency of said at least one power switch of said second resonant converter is shifted in phase with respect to switching frequency of said at least one power switch of said first resonant converter;

    wherein rms ripple current (Ir) applied to said filter capacitor may be characterized in accordance with the following equation;

    Ir=2π





    0π

    2


    (Ip

    sin





    t
    +Ip

    cos





    t
    -Iout
    )
    2








    t
    wherein Ip is a sinusoidal current waveform applied to said first and second rectification stages and Iout is DC output current; and

    wherein said ripple current Ir applied to said filter capacitor is approximately 9.5% of the DC output current Iout.

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