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公开(公告)号：US20220385190A1
公开(公告)日：2022-12-01
申请号：US17659655
申请日：2022-04-18
Applicant: Delta Electronics (Shanghai) Co.,Ltd.
Inventor： Hairui XU , Haibin SONG , Daofei XU , Jinfa ZHANG
Abstract: The invention discloses a converter adaptable to a wide range output voltage and a control method thereof. The converter comprises a PWM half-bridge circuit. The control method comprises the steps of: controlling the PWM half-bridge circuit to enter into a discontinuous conduction mode by regulating a switching frequency; when the PWM half-bridge circuit is operated in the discontinuous conduction mode, oscillation occurs among the output inductor, a magnetizing inductor of the transformer and a parasitic capacitor of the PWM half-bridge circuit, and when a center point voltage of the primary switching bridge arm reaches a valley or a peak, turning on the corresponding power switch. The invention reduces switching loss by controlling the corresponding power switch in the PWM half-bridge circuit to turn on when a voltage across the power switch is oscillated to valley.
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公开(公告)号：US20220385199A1
公开(公告)日：2022-12-01
申请号：US17658257
申请日：2022-04-07
Applicant: Delta Electronics (Shanghai) Co.,Ltd.
Inventor： Hairui XU , Haibin SONG , Daofei XU , Jinfa ZHANG
Abstract: The application discloses a converter adaptable to a wide range output voltage and a control method thereof. The converter includes a PWM half-bridge circuit. The control method includes: causing the PWM half-bridge circuit to enter into a DCM by regulating a switching frequency; in each switching period, extending conduction time or turning on a corresponding synchronous rectifier once again for a predetermined time before the first power switch and the second power switch are turned on, to realize zero voltage switching (ZVS) of the first power switch and the second power switch. The application realizes ZVS of the primary power switches, thereby reducing loss.
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公开(公告)号：US20220006389A1
公开(公告)日：2022-01-06
申请号：US17365992
申请日：2021-07-01
Applicant: Delta Electronics (Shanghai) Co., Ltd.
Inventor： Haibin SONG , Jian ZHOU , Hairui XU , Daofei XU , Jinfa ZHANG
Abstract: Disclosed are a voltage switching circuit and a power adapter having the same. The voltage switching circuit comprises a first switching circuit having a first terminal receiving a first voltage from a first converter, and a second switching circuit having a first terminal receiving a second voltage from a second converter. Second terminals of the first and second switching circuits are electrically connected to form a switching terminal for outputting an output voltage. When the output voltage is required to be switched from the first voltage to the second voltage, the first switching circuit is controlled to be turned off and then the second switching circuit is controlled to be turned on, and when a voltage at the first terminal of the second switching circuit is higher than a preset voltage, the second converter is shut down or kept off.
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