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公开(公告)号：US20230198280A1
公开(公告)日：2023-06-22
申请号：US18170603
申请日：2023-02-17
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Shengyong DAI , Xue ZHANG , Liang WU
IPC: H02J7/00
CPC classification number: H02J7/007182 , H02J7/00036 , H02J2207/40
Abstract: A charging circuit, an adapter, and a charging system and method are applied to a charging process of a terminal device. The terminal device may be charged by using an adapter having no electrolytic capacitor, which is conducive to achieving miniaturization of the adapter. When a voltage of a charging interface of the terminal device is low, the charging circuit may discharge by using a terminal battery, to maintain the voltage of the charging interface. The charging circuit may also decrease a charging current provided to the terminal battery, to maintain the voltage of the charging interface. The voltage of the charging interface may be equivalent to a voltage of an output interface of the adapter.
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公开(公告)号：US20220255444A1
公开(公告)日：2022-08-11
申请号：US17668991
申请日：2022-02-10
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: This application provides a controller and control system for a DC/DC converter. The DC/DC converter includes a first switching transistor, a second switching transistor, a first capacitor, and a transformer. The transformer includes an excitation inductor and a transformer leakage inductor. The controller controls the first switching transistor to turn on to form a first closed circuit, where a current in the excitation inductor increases in a first direction; when a preset time period expires, the controller controls the first switching transistor to turn off, so that a voltage at two ends of the second switching transistor decreases; and when the voltage at the two ends of the second switching transistor is a first preset voltage threshold, the controller controls the second switching transistor to turn on to form a second closed circuit. When embodiments of this application are implemented, a turn-on loss in the DC/DC converter can be reduced.
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公开(公告)号：US20230020390A1
公开(公告)日：2023-01-19
申请号：US17853479
申请日：2022-06-29
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: This application provides a switching conversion circuit, including: a power module, supplying power to a switching conversion module and an IC controller; and the switching conversion module is an asymmetrical half-bridge flyback structure and includes at least a first switching transistor, a second switching transistor, a first capacitor, and a transformer. The transformer includes a first secondary-side winding and a second secondary-side winding, and the first secondary-side winding of the transformer is coupled to a load. The IC controller turns on the first switching transistor or the second switching transistor based on a value of a first voltage, so that the switching conversion module enters an operating state to supply power to the load; and turns off the first switching transistor and the second switching transistor based on a value of a second voltage, so that the switching conversion module stops supplying power to the load.
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Patent Agency Ranking
公开(公告)号：US20220255455A1
公开(公告)日：2022-08-11
申请号：US17668238
申请日：2022-02-09
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: This application discloses a converter and a power adapter, to reduce an energy loss of the power adapter. The converter includes: a DC power supply, a primary power transistor, an auxiliary power transistor, a first capacitor, a transformer, and a control circuit. The first capacitor is connected in series to the transformer to form a series circuit, the series circuit is connected in parallel to a first terminal and a second terminal of the auxiliary power transistor. The control circuit is configured to: when an excitation current in the transformer is in a continuous state, regulate a target voltage to a preset voltage threshold, and control the primary power transistor to be turned on when first dead time ends, where the target voltage is a voltage between the first terminal of the primary power transistor and the ground.
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公开(公告)号：US20250096690A1
公开(公告)日：2025-03-20
申请号：US18959088
申请日：2024-11-25
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Chenghao SUN , Liang WU , Baolei DAI , Zhiqiang GUO
Abstract: This application provides a control circuit, a power supply module, and an electronic device. The power supply module includes a rectifier circuit and an asymmetric half-bridge flyback converter circuit which includes a main power transistor, an auxiliary power transistor, and a transformer. The control circuit controls the main power transistor and the auxiliary power transistor to be alternately turned on and off, so that the asymmetric half-bridge flyback converter circuit supplies power to a load. The control circuit is configured to: control the rectifier circuit to discharge to the transformer within preset duration; and after the rectifier circuit stops discharging to the transformer, control the main power transistor to be turned on based on a comparison result of a preset voltage value and voltage difference between a drain and a source of the main power transistor. This application reduce switching loss of the main power transistor.
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公开(公告)号：US20250088114A1
公开(公告)日：2025-03-13
申请号：US18960587
申请日：2024-11-26
Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Inventor： Chenghao SUN , Liang WU , Baolei DAI , Zhiqiang GUO
Abstract: This application provides a control circuit of a power supply module, and an electronic device. In one example, the power supply module includes a rectifier circuit and an active clamp flyback converter circuit which includes a main power transistor, an auxiliary power transistor, and a transformer. The control circuit is configured to: control the active clamp flyback converter circuit to operate in a discontinuous conduction mode, and control the rectifier circuit to discharge to the transformer within preset duration after the auxiliary power transistor is turned off and before the main power transistor is turned on; and after the rectifier circuit stops discharging to the transformer, control the main power transistor to be turned on based on a comparison result of a voltage difference between a drain and a source of the main power transistor and a preset voltage value.
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公开(公告)号：US20230006561A1
公开(公告)日：2023-01-05
申请号：US17941030
申请日：2022-09-09
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: This application discloses a converter and a power adapter, to reduce an energy loss of the power adapter. The converter includes a direct current power supply, a main power transistor, an auxiliary power transistor, a first capacitor, a transformer, and a control circuit. The first capacitor and the transformer are connected in series to form a series circuit. The series circuit is connected to a first terminal and a second terminal of the auxiliary power transistor in parallel. The control circuit is configured to: when the main power transistor is in a cutoff state and a target voltage reaches a target valley voltage, control the main power transistor to be conducted. The target voltage is a voltage between the first terminal of the main power transistor and the ground.
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公开(公告)号：US20220294358A1
公开(公告)日：2022-09-15
申请号：US17690840
申请日：2022-03-09
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: Embodiments of this application disclose an asymmetrical half-bridge flyback converter and a power supply system, to reduce a loss of the asymmetrical half-bridge flyback converter, and improve efficiency of the asymmetrical half-bridge flyback converter. The asymmetrical half-bridge flyback converter, including: a first power transistor, a second power transistor, a primary-side resonant capacitor, a transformer, a third power transistor, and a secondary-side resonant capacitor, where the first power transistor and the second power transistor are coupled to two terminals of a direct current power supply after being connected in series; and a primary side of the transformer is connected in parallel to two terminals of the first power transistor through the primary-side resonant capacitor, and a secondary side of the transformer is coupled to the third power transistor and the secondary-side resonant capacitor.
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