公开(公告)号：US20240243655A1

公开(公告)日：2024-07-18

申请号：US18617923

申请日：2024-03-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xijun ZHANG ,  Xue ZHANG ,  Jun YAO ,  Qiya YANG ,  Hongfeng LIANG ,  Chao GAO ,  Yongchao LI

IPC: H02M1/42 ,  H02M1/00

CPC classification number: H02M1/4225 ,  H02M1/0054

Abstract: In a power factor correction PFC circuit control method and a PFC circuit, a control module determines that an alternating current on a single-phase input/output terminal is in a positive half cycle. The control module turns on or turns off switching transistors on the first bridge arm and the second bridge arm, to boost a first voltage at a first parallel connection point. The control module turns on a switching transistor on the third bridge arm when determining that the first voltage is equal to a voltage of a positive bus of the direct current module. A switching loss of the PFC circuit can be effectively reduced, and performance of the PFC circuit can be improved.

公开(公告)号：US20230125476A1

公开(公告)日：2023-04-27

申请号：US18145311

申请日：2022-12-22

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xijun ZHANG ,  Jia LI ,  Jun YAO ,  Chao GAO

IPC: H01F27/30 ,  H01F27/28 ,  H01F27/24

Abstract: This application provides an electrical element, a circuit board, and a switching power supply. The electrical element includes a first magnetic core and a second magnetic core disposed opposite to each other. The first magnetic core and the second magnetic core enclose space for accommodating a winding. The first magnetic core and the second magnetic core are further configured to bind a magnetic induction wire. The electrical element further includes a third magnetic core located in the space enclosed by the first magnetic core and the second magnetic core. The third magnetic core is configured to wind the winding. The third magnetic core is fixedly connected to the first magnetic core and the second magnetic core. An air gap is disposed in at least one of the first magnetic core and/or the second magnetic core.

公开(公告)号：US20150093572A1

公开(公告)日：2015-04-02

申请号：US14559630

申请日：2014-12-03

Applicant: Huawei Technologies Co., Ltd. ,  Zhejiang University

Inventor： Xiaosong ZHOU ,  Yan XU ,  Chao GAO ,  Zhen XU

IPC: D01F9/12 ,  D01D5/06 ,  D01D10/06 ,  D01F1/09

CPC classification number: D01F9/12 ,  C01B32/182 ,  C01B32/194 ,  D01D5/06 ,  D01F1/09 ,  D01F11/10 ,  D10B2101/12 ,  D10B2101/20 ,  D10B2401/16 ,  Y10T428/2918

Abstract: A graphene fiber and a preparation method thereof, where the graphene fiber is a composite fiber of metal nanowire doped graphene fiber, and principal components of the composite fiber are graphene and metal nanowires, a mass ratio of metal nanowires is 0.1%-50%, the graphene is in a form of sheet, and both the metal nanowires and graphene sheets are arranged in parallel along an axial direction of the graphene fiber. The metal nanowire doped graphene fiber is a new type of a high performance multi-functional fiber material, which achieves a significant improvement in electrical conductivity of graphene fibers through doping of metal nanowires and meanwhile demonstrates excellent tensile strength and toughness. The metal nanowire doped graphene fiber has great potential application value in a plurality of fields, for example, it is used as a lightweight flexible wire.

Abstract translation: 石墨烯纤维及其制备方法，其中石墨烯纤维是金属纳米线掺杂石墨烯纤维的复合纤维，复合纤维的主要成分是石墨烯和金属纳米线，金属纳米线的质量比为0.1％-50％ 石墨烯为片状，并且金属纳米线和石墨烯片均沿着石墨烯纤维的轴向平行地排列。 金属纳米线掺杂石墨烯纤维是一种新型的高性能多功能纤维材料，通过掺杂金属纳米线，可显着提高石墨烯纤维的电导率，同时显示出优异的拉伸强度和韧性。 金属纳米线掺杂石墨烯光纤在多个场中具有很大的潜在应用价值，例如，其用作轻质柔性线。

公开(公告)号：US20150104642A1

公开(公告)日：2015-04-16

申请号：US14577609

申请日：2014-12-19

Applicant: Huawei Technologies Co., Ltd. ,  Zhejiang University

Inventor： Chao GAO ,  Xiaozhen HU ,  Xiaosong ZHOU ,  Yan XU

IPC: D01D5/06 ,  D01F9/12

CPC classification number: D01D5/06 ,  B82Y30/00 ,  B82Y40/00 ,  D01D1/02 ,  D01D5/14 ,  D01F1/09 ,  D01F6/50 ,  D01F6/90 ,  D01F6/92 ,  D01F9/12 ,  D01F11/04 ,  D01F11/16 ,  Y10T428/2927

Abstract: A graphene composite fiber includes graphene sheets and a polymer for aggregating the graphene sheets together. The polymer includes either or both of a hyperbranched polymer and polyvinyl alcohol. The graphene sheets and the polymer are stacked on each other to form a layered structure, and the graphene sheets are regularly arranged along an axial direction of the graphene composite fiber. In a production method of the graphene composite fiber, a graphene oxide is used as a raw material, which significantly improves tensile strength of the graphene composite fiber. Addition of the polymer provides good tenacity for the composite fiber. In a spinning process, rotated coagulant is used to increase a tensile force of a gelatinous fiber, so that the gelatinous fiber has high orientation and tacticity, thereby significantly improving strength of an obtained solid fiber. The final reduction process restores electrical conductivity of a graphene fairly well.

Abstract translation: 石墨烯复合纤维包括石墨烯片和用于将石墨烯片聚集在一起的聚合物。 聚合物包括超支化聚合物和聚乙烯醇中的一种或两种。 石墨烯片和聚合物彼此堆叠以形成层状结构，并且石墨烯片沿着石墨烯复合纤维的轴向规则地排列。 在石墨烯复合纤维的制造方法中，使用氧化石墨烯作为原料，显着提高了石墨烯复合纤维的拉伸强度。 添加聚合物为复合纤维提供了良好的韧性。 在纺丝过程中，旋转的凝结剂用于增加凝胶状纤维的张力，使得凝胶状纤维具有高取向和立构规整度，从而显着提高所得固体纤维的强度。 最终的还原过程相当好地恢复了石墨烯的电导率。