公开(公告)号：US20240297591A1

公开(公告)日：2024-09-05

申请号：US18364748

申请日：2023-08-03

Applicant: DELTA ELECTRONICS, INC.

Inventor： Sheng-Hua LI ,  You-Si LIN

IPC: H02M3/335 ,  H02M1/00 ,  H02M3/00

CPC classification number: H02M3/33573 ,  H02M1/0025 ,  H02M1/0058 ,  H02M3/01

Abstract: A full-bridge series resonant converter includes a full-bridge switch circuit, a transformer, a resonant tank, a sensing circuit, and a processing circuit. The full-bridge switch circuit includes a first switch leg and a second switch leg having a second lower switch. The resonant tank includes a resonant inductor, a magnetizing inductor, and a resonant capacitor. The sensing circuit is coupled between the resonant capacitor and a ground point of a primary side of the transformer for sensing a node voltage between the resonant capacitor and the ground point as a sensing voltage. The processing circuit counts a turned-on time of the second lower switch as a first half-cycle time based on the sensing voltage, and duplicates the first half-cycle time as a second half-cycle time for controlling the full-bridge switch circuit.