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Buck-boost converter

  • US 7,268,525 B2
  • Filed: 09/27/2006
  • Issued: 09/11/2007
  • Est. Priority Date: 09/30/2005
  • Status: Expired due to Fees
First Claim
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1. A buck-boost converter, comprising:

  • a buck converter section including a first switch, first rectifier means, and an inductor;

    a boost converter section sharing the inductor and including a second switch, second rectifier means, and smoothing means; and

    a control circuit for generating and outputting a first driving signal for opening and closing the first switch and a second driving signal for opening and closing the second switch,wherein the control circuit includes;

    an error amplifier circuit for amplifying an error between an output value from the smoothing means and a predetermined voltage value to thereby generate and output an error signal;

    an oscillator circuit for generating and outputting a triangular wave signal having a predetermined cycle;

    a compensatory signal generation circuit for generating and outputting a compensatory signal, which oscillates in a cycle that is at least twice the cycle of the triangular wave signal;

    a control signal generation circuit for adding together the error signal and the compensatory signal to thereby generate and output a control signal; and

    a comparator circuit for comparing the triangular wave signal with the control signal to generate and output the first or second driving signal.

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