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Patent Agency Ranking
公开(公告)号：US20200273617A1
公开(公告)日：2020-08-27
申请号：US16871145
申请日：2020-05-11
Applicant: Huawei Technologies Co., Ltd.
Abstract: A planar transformer includes a primary winding including a first primary winding layer, a secondary winding including a first secondary winding layer, where an Ns1th turn of coil to an (Ns1+B1−1)th turn of coil in the secondary winding are disposed at the first secondary winding layer, and a charge balance winding including a first charge balance winding layer, where the first charge balance winding layer is disposed between the first primary winding layer and the first secondary winding layer, and is adjacent to the first primary winding layer and the first secondary winding layer. N1 turns of coils are disposed at the first charge balance winding layer, where N1 is greater than or equal to Nb1.
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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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公开(公告)号：US20230260694A1
公开(公告)日：2023-08-17
申请号：US18306363
申请日：2023-04-25
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
CPC classification number: H01F27/38 , H01F27/24 , H01F27/29 , H01F27/2804
Abstract: A first noise cancellation winding is disposed between a primary winding and a secondary winding of the planar transformer, and a quantity of coil turns of each noise cancellation winding layer in the first noise cancellation winding is selected to suppress common mode noise generated by the secondary winding or the primary winding and improve noise suppression performance. The first noise cancellation winding is formed by at least two noise cancellation winding layers being connected in series, and other noise cancellation winding layers in the first noise cancellation winding that are connected in series to a first noise winding layer to increase an induced voltage of the first noise winding layer. The foregoing structure allows for a reduced number of coil turns in the first winding layer, compared to existing technology, to reach a required induced voltage.
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公开(公告)号：US11062837B2
公开(公告)日：2021-07-13
申请号：US16871145
申请日：2020-05-11
Applicant: Huawei Technologies Co., Ltd.
Abstract: A planar transformer includes a primary winding including a first primary winding layer, a secondary winding including a first secondary winding layer, where an Ns1th turn of coil to an (Ns1+B1−1)th turn of coil in the secondary winding are disposed at the first secondary winding layer, and a charge balance winding including a first charge balance winding layer, where the first charge balance winding layer is disposed between the first primary winding layer and the first secondary winding layer, and is adjacent to the first primary winding layer and the first secondary winding layer. N1 turns of coils are disposed at the first charge balance winding layer, where N1 is greater than or equal to Nb1.
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