公开(公告)号：US20210111620A1

公开(公告)日：2021-04-15

申请号：US17029533

申请日：2020-09-23

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Yiqing Jin ,  Siran Wang ,  Hantao Lin

IPC: H02M1/08 ,  H02M3/335

Abstract: A control circuit used in a resonant converter with a switching circuit and a resonant circuit is provided, the switching circuit has a high side transistor and a low side transistor, the resonant circuit has a resonant capacitor and a resonant inductor. The control circuit includes: a calculating module used to generate an output current calculating value based on a voltage across the resonant capacitor and a correction signal at an off moment of the high side transistor; a comparing module used to compare the output current calculating value with a burst mode threshold value and generate a burst mode control signal by comparing the output current calculating value with the burst mode threshold value; and a switching control module used to control the resonant converter to work in a burst mode or a normal mode based on the burst mode control signal.

公开(公告)号：US11277071B2

公开(公告)日：2022-03-15

申请号：US17029533

申请日：2020-09-23

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Yiqing Jin ,  Siran Wang ,  Hantao Lin

IPC: H02M3/335 ,  H02M1/08 ,  H02M1/00

Abstract: A control circuit used in a resonant converter with a switching circuit and a resonant circuit is provided, the switching circuit has a high side transistor and a low side transistor, the resonant circuit has a resonant capacitor and a resonant inductor. The control circuit includes: a calculating module used to generate an output current calculating value based on a voltage across the resonant capacitor and a correction signal at an off moment of the high side transistor; a comparing module used to compare the output current calculating value with a burst mode threshold value and generate a burst mode control signal by comparing the output current calculating value with the burst mode threshold value; and a switching control module used to control the resonant converter to work in a burst mode or a normal mode based on the burst mode control signal.