Patent ID: 9621041
Date: 2017-04-11
CPC Classifications: H02M,Y02B

Claim:
1. A controller for a Buck-Boost converter comprising a Buck switch coupled between an input voltage and an inductor and a Boost switch coupled to the inductor and through an output switch to an output of the converter at which an output voltage is provided, the controller comprising: a feedback control circuit responsive to the converter output and configured to generate a first control signal for one of the Buck switch and the Boost switch; and a feed forward control circuit responsive to the input voltage and configured to generate a second control signal for the other one of the Buck switch and the Boost switch, wherein the feed forward control circuit comprises a programmable device selected based on a predetermined level for the output voltage, wherein the feedback control circuit is configured to generate the first control signal for the Buck switch and the feed forward control circuit is configured to generate the second control signal for the Boost switch, and wherein a duty cycle of the Boost switch is based on the value of the input voltage, a desired duty cycle of the Buck switch when the converter transitions between a Buck mode of operation and a Buck-Boost mode of operation, and the predetermined level for the output voltage.