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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：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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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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