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Patent Agency Ranking
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：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
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.
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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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公开(公告)号：US10128760B2
公开(公告)日：2018-11-13
申请号：US14841729
申请日：2015-09-01
Applicant: DELTA ELECTRONICS, INC.
Inventor： Haibin Song , Jian Zhou
Abstract: A PCB planar transformer, comprising: at least one primary winding layer, each formed with a primary winding therein, wherein wire traces constituting the primary winding have a first horizontal width; at least one secondary winding layer, each formed with a secondary winding therein, wherein wire traces constituting the secondary winding have a second horizontal width; and at least one shielding layer, each located between the primary winding layer and the adjacent secondary winding layer, wherein the shielding layer is formed with a conductor therein, and the conductor in the shielding layer has a third horizontal width, wherein at least one of the first horizontal and the second horizontal width is smaller than the third horizontal width of the conductor in the shielding layer.
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