Control method and control circuit for four-switch buck-boost converter
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United States of America Patent
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Jul 4, 2017
Grant Date -
Jun 11, 2015
app pub date -
Dec 4, 2014
filing date -
Dec 11, 2013
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Abstract
In one embodiment, a method of controlling a converter can include: (i) when first and fourth switches are on, and second and third switches are off, generating an on time signal according to an input voltage and a stable output voltage of the converter; (ii) generating an off time signal according to the input voltage and the stable output voltage of the converter; (iii) generating a reference time voltage according to a reference current signal and a reference voltage signal; and (iv) controlling the first, second, third, and fourth switches based on whether the on time signal is activated to indicate that the converter is operating in a buck mode, the off time signal is activated to indicate that the converter is operating in a boost mode, or the reference time signal is activated to indicate that the converter is operating in a buck-boost mode.
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