Control method of high efficient buck-boost switching regulator
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United States of America Patent
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Jun 25, 2019
Grant Date -
Sep 18, 2014
app pub date -
Mar 20, 2013
filing date -
Mar 15, 2013
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Abstract
The present disclosure relates to methods and circuits to achieve a buck-boost switching regulator that allows changing operation modes without causing large output ripples during transition of operation modes Increased error amplifier output voltage range over which the converter stays in its present operating mode (buck or boost or buck-boost), resulting in hysteresis between error amplifier output voltage and output voltage). The larger the hysteresis, the smaller will be the likeliness of having to switch between modes. A first embodiment is combining masking logic applied to signals driving the switches of the switching regulator and offset feedback to outputs of the error amplifier in order to providing hysteresis to suppress operation mode bounce and to minimize ripples while a second embodiment is monitoring pulse width of PWM pulses by a pulse width checker.
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