公开(公告)号：US12062985B1

公开(公告)日：2024-08-13

申请号：US18566102

申请日：2022-09-26

Applicant: SOUTHEAST UNIVERSITY

Inventor： Qi Liu ,  Weiwei Zhai ,  Leilei Shi ,  Qinsong Qian ,  Weifeng Sun ,  Longxing Shi

IPC: H02M3/158 ,  H02M1/00 ,  H02M1/088

CPC classification number: H02M3/1582 ,  H02M1/0058 ,  H02M1/088

Abstract: A control method for a four-switch buck-boost converter is provided. The control method adopts four-stage control, and divides the load range into two sections and adopts different control strategies according to a critical load value corresponding to optimal control. In Boost mode, before the critical load, T1 and T2 are kept constant, T3 is a minimum value for realizing soft-switching, and T4 decreases with the increase of the load; when the critical load is reached, T4 drops to 0; and after the critical load, T1, T2, T3 and T increase with the load. In Buck mode, before the critical load, T2 and T3 are kept constant, T1 is a minimum value for realizing soft-switching, and T4 decreases with the increase of the load; when the critical load is reached, T4 drops to 0; and after the critical load, T1, T2, T3 and T increase with the load.