公开(公告)号：US11984813B2

公开(公告)日：2024-05-14

申请号：US17435789

申请日：2020-05-15

Applicant: SOUTHEAST UNIVERSITY ,  CSMC TECHNOLOGIES FAB2 CO., LTD.

Inventor： Shen Xu ,  Siyu Zhao ,  Congming Qi ,  Sen Zhang ,  Xiaoyu Shi ,  Weifeng Sun ,  Longxing Shi

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/38

CPC classification number: H02M3/33592 ,  H02M1/0058 ,  H02M1/38

Abstract: A synchronous rectification control system and method for a quasi-resonant flyback converter are provided. The control system includes a switching transistor voltage sampling circuit configured to sample an output terminal voltage of the switching transistor to obtain a sampled voltage of the switching transistor; a sampling calculation module configured to obtain a dead-time based on the sampled voltage of the switching transistor and a preset relationship, the preset relationship being a correspondence between the duration of the sampled voltage of the switching transistor being below a first preset value and the dead-time during an on-time of a switching cycle of the switching transistor, the dead-time being a time from when the switching transistor is turned off to when the synchronous rectification transistor is turned on; and a control module configured to receive the dead-time and control switching of the synchronous rectification transistor based on the dead-time.

公开(公告)号：US11777416B2

公开(公告)日：2023-10-03

申请号：US17418606

申请日：2019-12-19

Applicant: SOUTHEAST UNIVERSITY ,  CSMC TECHNOLOGIES FAB2 CO., LTD.

Inventor： Weifeng Sun ,  Huaxin Zhang ,  Hu Zhang ,  Menglin Yu ,  Siyu Zhao ,  Shen Xu ,  Longxing Shi

IPC: H02M3/335

CPC classification number: H02M3/33592

Abstract: A flyback converter and an output voltage acquisition method therefor and apparatus thereof, wherein the output voltage acquisition method comprises the following steps: acquiring the reference output voltage of a flyback converter; sampling the current output voltage of the flyback converter within a reset time of each switching period among M continuous switching periods of the flyback converter, wherein M is a positive integer; and according to the reference output voltage and the current output voltage, sampling a dichotomy to successively approximate the current output voltage until the M switching periods are finished, and acquiring the output voltage of the flyback converter.