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1.发明公开公开(公告)号：US20230170809A1
公开(公告)日：2023-06-01
申请号：US18160455
申请日：2023-01-27
Applicant: Huawei Digital Power Technologies Co., Ltd.
CPC classification number: H02M3/33569 , H02M1/0058
Abstract: A control method of a two-transistor flyback converter including an auxiliary circuit, where before charging of a primary-side winding starts, the control method may include the auxiliary circuit may increasing a potential at a first end of the primary-side winding, and decreasing a potential at a second end of the primary-side winding. By adding the auxiliary circuit, soft switching can be implemented for switching transistors at both ends of the primary-side winding.
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公开(公告)号：US12224680B2
公开(公告)日：2025-02-11
申请号：US18163481
申请日：2023-02-02
Applicant: Huawei Digital Power Technologies Co., Ltd.
IPC: H02M7/483 , H02M1/00 , H02M7/5387
Abstract: An active clamp flyback circuit includes: a clamp capacitor that is connected to a primary-side winding of a transformer and that is configured to absorb leakage inductance energy of the primary-side winding; an auxiliary switching transistor that is configured to control the clamp capacitor to perform reverse excitation power charging on the primary-side winding by using the auxiliary switching transistor; a first diode, where the first diode is connected in series between the clamp capacitor and the auxiliary switching transistor; and a second diode, where the second diode is connected between the first diode and the clamp capacitor, and the second diode is connected in series between the clamp capacitor and a primary-side auxiliary winding.
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公开(公告)号：US12040699B2
公开(公告)日：2024-07-16
申请号：US17862462
申请日：2022-07-12
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Jie Ren
CPC classification number: H02M1/4233 , H02M1/0009 , H02M1/08
Abstract: A drive controller is used in a control system of a power factor correction (PFC) circuit. The control system further includes the PFC circuit. The PFC circuit includes a first bridge arm, a second bridge arm, a first switching transistor, and a second switching transistor. The driving controller includes a sampling circuit and a driving circuit. The sampling circuit is configured to obtain a target current value between the first switching transistor and the second switching transistor. The drive circuit is configured to turn off gate inputs of the first switching transistor and the second switching transistor when the target current value is greater than a current threshold, to turn off the first switching transistor and the second switching transistor and protect the control system.
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公开(公告)号：US11837957B2
公开(公告)日：2023-12-05
申请号：US17144323
申请日：2021-01-08
Applicant: Huawei Digital Power Technologies Co., Ltd.
CPC classification number: H02M3/1582 , H02M1/08 , H02M1/0009
Abstract: A control circuit applied to a power adapter includes a voltage conversion unit and a switch control unit. The voltage conversion unit is configured to: receive a first direct current voltage, and generate a second direct current voltage based on the first direct current voltage, where when the first direct current voltage is lower than a working voltage of the switch control unit, the voltage conversion unit is configured to boost the first direct current voltage, to obtain the second direct current voltage. The switch control unit is configured to: receive the second direct current voltage from the voltage conversion unit, and use the second direct current voltage as a power supply voltage of the switch control unit.
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