公开(公告)号：US12294296B2

公开(公告)日：2025-05-06

申请号：US18112733

申请日：2023-02-22

Applicant: DELTA ELECTRONICS, INC.

Inventor： Chun-Hao Huang ,  Chun-Wei Lin ,  I-Hsiang Shih ,  Ching-Nan Wu ,  Jia-Wei Yeh

IPC: H02M1/42 ,  H02M1/00

Abstract: A Totem Pole PFC circuit includes at least one fast-switching leg, a slow-switching leg, and a control unit. Each fast-switching leg includes a fast-switching upper switch and a fast-switching lower switch. The slow-switching leg is coupled in parallel to the at least one fast-switching leg, and the slow-switching leg includes a slow-switching upper switch and a slow-switching lower switch. The control unit receives an AC voltage with a phase angle, and the control unit includes a current detection loop, a voltage detection loop, and a control loop. The control loop generates a second control signal assembly to respectively control the slow-switching upper switch and the slow-switching lower switch. The control loop controls the second control signal assembly to follow the phase angle, and dynamically adjusts a duty cycle of the second control signal assembly to turn on or turn off the slow-switching upper switch and the slow-switching lower switch.