公开(公告)号：USRE50277E1

公开(公告)日：2025-01-21

申请号：US16931904

申请日：2020-07-17

Applicant: Delta Electronics, Inc.

Inventor： Haibin Song ,  Laszlo Huber ,  Daofei Xu ,  Alpha Zhang ,  Milan M. Jovanovic ,  Chien-Chung Chang

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/32 ,  H02M1/34

Abstract: A flyback power converter includes a hybrid clamp circuit and a corresponding power management unit that substantially optimizes the performance of the flyback power converter in its entire line and load ranges. The clamp circuit, which is connected in parallel to a primary winding of the flyback transformer, includes a parallel combination of a capacitor and resistor that is connected in series with a parallel combination of a switch and a diode. By sensing the operating conditions, the power management circuit configures the clamp circuit either as a passive clamp or as an active clamp. In the passive-clamp configuration, the switch is kept turned off. In the active-clamp configuration, the switch operates with pulse-width modulation (PWM) which enables ZVS turn-on of the main switch.

公开(公告)号：US10141853B2

公开(公告)日：2018-11-27

申请号：US15428885

申请日：2017-02-09

Applicant: DELTA ELECTRONICS, INC.

Inventor： Haibin Song ,  Laszlo Huber ,  Daofei Xu ,  Alpha Zhang ,  Milan M. Jovanovic ,  Chien-Chung Chang

IPC: H02M3/335 ,  H02M1/32 ,  H02M1/00

Abstract: A flyback power converter includes a hybrid clamp circuit and a corresponding power management unit that substantially optimizes the performance of the flyback power converter in its entire line and load ranges. The clamp circuit, which is connected in parallel to a primary winding of the flyback transformer, includes a parallel combination of a capacitor and resistor that is connected in series with a parallel combination of a switch and a diode. By sensing the operating conditions, the power management circuit configures the clamp circuit either as a passive clamp or as an active clamp. In the passive-clamp configuration, the switch is kept turned off. In the active-clamp configuration, the switch operates with pulse-width modulation (PWM) which enables ZVS turn-on of the main switch.

公开(公告)号：US20180226895A1

公开(公告)日：2018-08-09

申请号：US15428885

申请日：2017-02-09

Applicant: DELTA ELECTRONICS, INC.

Inventor： Haibin Song ,  Laszlo Huber ,  Daofei Xu ,  Alpha Zhang ,  Milan M. Jovanovic ,  Chien-Chung Chang

IPC: H02M3/335 ,  H02M1/32 ,  H02M1/08

CPC classification number: H02M3/33569 ,  H02M1/32 ,  H02M1/34 ,  H02M3/33592 ,  H02M2001/0009 ,  H02M2001/0048 ,  H02M2001/0054 ,  H02M2001/344

Abstract: A flyback power converter includes a hybrid clamp circuit and a corresponding power management unit that substantially optimizes the performance of the flyback power converter in its entire line and load ranges. The clamp circuit, which is connected in parallel to a primary winding of the flyback transformer, includes a parallel combination of a capacitor and resistor that is connected in series with a parallel combination of a switch and a diode. By sensing the operating conditions, the power management circuit configures the clamp circuit either as a passive clamp or as an active clamp. In the passive-clamp configuration, the switch is kept turned off. In the active-clamp configuration, the switch operates with pulse-width modulation (PWM) which enables ZVS turn-on of the main switch.