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Two-stage insulated bidirectional DC/DC power converter using a constant duty ratio LLC resonant converter

  • US 8,467,199 B2
  • Filed: 07/08/2010
  • Issued: 06/18/2013
  • Est. Priority Date: 10/21/2009
  • Status: Active Grant
First Claim
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1. A two-stage bidirectional DC/DC power converter using a constant duty ratio LLC resonant converter, the two-stage bidirectional DC/DC power converter comprising:

  • an LLC resonant converter operating at a constant duty ratio;

    a bidirectional converter joined to a front part of the LLC resonant converter, the bidirectional converter configured to perform a boost converter function of converting a first input voltage into a first consistent voltage for input to the LLC resonant converter when the bidirectional converter operates in a forward direction, and to perform a buck converter function of reducing a second input voltage that is output from the LLC resonant converter into a second consistent voltage when the bidirectional converter operates in a reverse direction; and

    a bidirectional converter control unit configured to control changes in the input voltages received by the bidirectional converter and regulate the voltages output from the LLC resonant converter to thereby maintain the first consistent voltages for input to the LLC resonant converter, such that the LLC resonant converter operates at the constant duty ratio.

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