BUCK-BOOST CONVERTERS AND POWER MANAGEMENT INTEGRATED CIRCUITS INCLUDING THE SAME

摘要

A buck-boost converter includes: a converting circuit; a ripple injector; a hysteresis comparator; and a switching controller. The converting circuit is configured to generate an output voltage by adjusting an input voltage in a buck mode, a boost mode, and a buck-boost mode. The ripple injector is configured to generate a ripple based on switching signals corresponding to switching operations of the converting circuit. The hysteresis comparator outputs at least one switching control signal by comparing an output control voltage with a feedback voltage generated by adding the ripple to a divided voltage generated by performing a voltage division on the output voltage. The switching controller is configured to change a current flow path of the converting circuit based on the at least one switching control signal.

主权项

1. A buck-boost converter comprising:
a converting circuit configured to
generate a first output voltage by stepping down an input voltage in a buck mode,generate a second output voltage by stepping up or down the input voltage in a buck-boost mode, andgenerate a third output voltage by stepping up the input voltage in a boost mode, wherein the second output voltage has a voltage level between a voltage level of the first output voltage and a voltage level of the third output voltage; a ripple injector configured to generate a ripple corresponding to an alternating-current voltage based on switching signals corresponding to switching operations of the converting circuit in the buck mode, the buck-boost mode, and the boost mode; a hysteresis comparator configured to output at least one switching control signal based on a comparison between an output control voltage and a feedback voltage, the feedback voltage being generated by adding the ripple to a divided voltage, and the divided voltage being generated by performing voltage division on the first output voltage in the buck mode, performing voltage division on the second output voltage in the buck-boost mode, and performing voltage division on the third output voltage in the boost mode; and a switching controller configured to change a current flow path of the converting circuit based on the at least one switching control signal.