公开(公告)号：US20220140741A1

公开(公告)日：2022-05-05

申请号：US17308188

申请日：2021-05-05

Applicant: National Taiwan University of Science and Technology

Inventor： JING-YUAN LIN ,  PIN-HSIEN LIU ,  Ju-Hsin Chen ,  HSUAN-YU YUEH

IPC: H02M3/335 ,  H02M1/00

Abstract: An LLC resonant converter is provided, which includes an input power source, a full-bridge switch circuit, a resonant circuit, a transformer, a rectifier circuit, a load, and a control circuit. The control circuit includes a load detection circuit and a valley switching circuit. The load detection circuit detects a load state of the load. The valley switching circuit is configured to, in response to the load state being a light load state: correspondingly generate a first difference voltage; calculate a first switch on-time for a first switch and a fourth switch; generate switching signals that control the first switch and the fourth switch to be turned off, and detect voltage valleys of a second switch and a third switch; and generate the switching signals to control the second switch and the third switch to be turned on according to the calculated first switch on-time.

公开(公告)号：US11437918B2

公开(公告)日：2022-09-06

申请号：US17308188

申请日：2021-05-05

Applicant: National Taiwan University of Science and Technology

Inventor： Jing-Yuan Lin ,  Pin-Hsien Liu ,  Ju-Hsin Chen ,  Hsuan-Yu Yueh

IPC: H02M3/335 ,  H02M1/00

Abstract: An LLC resonant converter is provided, which includes an input power source, a full-bridge switch circuit, a resonant circuit, a transformer, a rectifier circuit, a load, and a control circuit. The control circuit includes a load detection circuit and a valley switching circuit. The load detection circuit detects a load state of the load. The valley switching circuit is configured to, in response to the load state being a light load state: correspondingly generate a first difference voltage; calculate a first switch on-time for a first switch and a fourth switch; generate switching signals that control the first switch and the fourth switch to be turned off, and detect voltage valleys of a second switch and a third switch; and generate the switching signals to control the second switch and the third switch to be turned on according to the calculated first switch on-time.