公开(公告)号：US20230246550A1

公开(公告)日：2023-08-03

申请号：US18155407

申请日：2023-01-17

Applicant: STMicroelectronics S.r.l.

Inventor： Ranieri Guerra ,  Leandro Grasso ,  Serena Angela Versace ,  Francesca Giacoma Mignemi ,  Nunzio Greco

IPC: H02M3/158 ,  H02M1/08 ,  H02M3/157

CPC classification number: H02M3/1582 ,  H02M1/08 ,  H02M3/157

Abstract: In accordance with an embodiment, a method of operating a buck-boost power supply includes operating the buck-boost power supply in a buck mode by providing a PWM signal to a first half-bridge circuit, and turning on a charge transfer switch coupled between a first boosted supply node of a second driver circuit coupled to the first half-bridge circuit and a second boosted supply node of a second driver circuit coupled to a second half-bridge circuit when a voltage between the second boosted supply node and an output of the second half-bridge circuit is below a first threshold; and operating the buck-boost power supply in a boost mode by providing a PWM signal to the second half-bridge circuit, and turning on the charge transfer switch when the voltage between the first boosted supply node and an output of the first half-bridge circuit is below a second threshold.