Buck-boost converter and control circuit thereof
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United States of America Patent
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Feb 21, 2017
Grant Date -
Jan 5, 2017
app pub date -
Oct 16, 2015
filing date -
Jul 1, 2015
priority date (Note) -
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Abstract
A buck-boost converter and a control circuit thereof are disclosed. When an input voltage is close to an output voltage (i.e., the buck-boost converter operates in a buck-boost mode), the control circuit of the buck-boost converter generates specific switching signals. Four switches of a switching regulator are switched by the switching signals, so that the four switches are not turned-on or turned-off frequently because of the input voltage closing to the output voltage. Accordingly, the buck-boost converter and the control circuit thereof of the disclosure can reduce switch noise of the four switches and switching loss of the whole circuit, to improve conversion efficiency of the buck-boost converter.
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