Buck-boost converter
First Claim
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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Accused Products
Abstract
A buck-boost converter includes: a buck converter section including a first switch, a first rectifier, and an inductor; a boost converter section sharing the inductor and including a second switch, a second rectifier, and a smoothing circuit; 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. The control circuit includes: an error amplifier circuit for amplifying an error between an output value from the smoothing circuit 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.
46 Citations
13 Claims
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1. A buck-boost converter, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification