公开(公告)号：US09787193B2

公开(公告)日：2017-10-10

申请号：US14842849

申请日：2015-09-02

Applicant: DELTA ELECTRONICS, INC.

Inventor： Haibin Song ,  Daofei Xu

IPC: H02M1/15 ,  H02M3/335 ,  H02M7/06 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M1/15 ,  H02M3/335 ,  H02M7/06 ,  H02M2001/007

Abstract: A switching power supply includes: a rectifying unit; a Bulk capacitor; a converter; a monitoring circuit; a control circuit, controlling discharging of the Bulk capacitor, being configured to perform controls such that the voltage across the Bulk capacitor maintains the peak value after the Bulk capacitor having been charged to a peak value of AC voltage, and to perform controls such that the Bulk capacitor discharges from a peak value when the instantaneous absolute value of the AC voltage is smaller than or equal to the preset voltage. A method for controlling a voltage of a Bulk capacitor in the switching power supply includes detecting an instantaneous absolute value of the AC voltage; comparing the detected instantaneous absolute value of the AC voltage with a preset voltage; and controlling discharging and charging state of the Bulk capacitor according to comparison results.

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.