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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
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.
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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
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.
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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
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.
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