公开(公告)号：US20230096383A1

公开(公告)日：2023-03-30

申请号：US17951703

申请日：2022-09-23

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Claudio ADRAGNA ,  Massimiliano GOBBI ,  Giuseppe BOSISIO

IPC: H02M3/335

Abstract: An active flyback converter is transitioned between a plurality of operational states based on a comparison of a control voltage signal to voltage thresholds and a count of a number of consecutive switching cycles during which a clamp switch is kept off. The plurality of operational states includes a run state, an idle state, a first burst state, and a second burst state. Each set of consecutive switching cycles of the first burst state includes a determined number of switching cycles during which signals are generated to turn the power switch on and off and to maintain an off state of the clamp switch, and a switching cycle in a determined position in the set of switching cycles during which signals are sequentially generated to turn the power switch on, turn the power switch off, turn the clamp switch on and turn the clamp switch off.

公开(公告)号：US20250023479A1

公开(公告)日：2025-01-16

申请号：US18896371

申请日：2024-09-25

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Claudio ADRAGNA ,  Massimiliano GOBBI ,  Giuseppe BOSISIO

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/34

Abstract: An active flyback converter is transitioned between a plurality of operational states based on a comparison of a control voltage signal to voltage thresholds and a count of a number of consecutive switching cycles during which a clamp switch is kept off. The plurality of operational states includes a run state, an idle state, a first burst state, and a second burst state. Each set of consecutive switching cycles of the first burst state includes a determined number of switching cycles during which signals are generated to turn the power switch on and off and to maintain an off state of the clamp switch, and a switching cycle in a determined position in the set of switching cycles during which signals are sequentially generated to turn the power switch on, turn the power switch off, turn the clamp switch on and turn the clamp switch off.