Patent ID: 7268525

Claim:
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.