Patent ID: 9705401
Date: 2017-07-11
CPC Classifications: H02M

Claim:
1. A buck-boost converter comprising: a converting circuit configured to 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; wherein the hysteresis comparator includes