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公开(公告)号：US20210135575A1
公开(公告)日：2021-05-06
申请号：US17144323
申请日：2021-01-08
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
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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公开(公告)号：US20220014092A1
公开(公告)日：2022-01-13
申请号：US17484005
申请日：2021-09-24
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Jie Ren , Xue Zhang , Weiyang Zhao
Abstract: A current detection apparatus includes: a first induction circuit including a first auxiliary inductor that is coupled to the power inductor; a second induction circuit including a second auxiliary inductor that is coupled to the power inductor; a detection node between the first induction circuit and the second induction circuit, where the detection node outputs a detection signal; a first switching transistor that is connected in parallel to the first induction circuit; and a second switching transistor that is connected in parallel to the second induction circuit. When an alternating current power supply of a circuit in which the power inductor is located is positive, the first switching transistor is turned on, and the second switching transistor is turned off. When the alternating current power supply is negative, the second switching transistor is turned on, and the first switching transistor is turned off.
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