Huawei Technologies Co., Limited

Delta Electronics (shanghai) Co., Ltd

Sabic Global Technolgoies B.v.

Huawei Digital Power Technologies Co., Ltd.

Shanghai Jiaotong University

Inventec Appliances Corporation

Shpp Global Technologies B.v.

Yuan Zhou

Yiqing Ye

Dong Hai Yu

Xiaoni Xin

Haoyi Ye

Meng Hou

Zhiheng Fu

Wei Zhang

Hanyang Wang

Wei Feng

Pengfei Wu

Adel Fawzy Bastawros

Lin Gao

Wenjun Li

Bucheng Ji

Xing Zhang

Zhi Jun Wang

Yi Chen

Huayao Bao

Pengkai Ji

Ning Ma

Mingjie Dong

Long Zhang

Chien-ming Lee

Shijie Song

Zhi Wang

Rui Wu

Jian Zhou

Lijun Ying

Zhe Chen

Yun Hu

Daxiang Cui

Chen-Chen Liu

Xiaopeng Liu

Han Jin

Cuili Xue

Kexin Liu

Ben Lai

Danfeng Feng

Chuntao Tang

Qingxia Li

Rong Rong

Shoubao Yang

Shen Hu

Nadia Grossiord

Guanbo Hou

Xiaoying Gan

Xin Long

Sen Hu

Shuaijie Wang

Zhengqiang Zhang

Yuna Zhang

Yuli Xv

Marco Nefs

An example antenna system includes a first antenna including a strip-shaped antenna radiator. The antenna radiator has a first end and a second end. At least one of a first radiator section in which the first end is located or a second radiator section in which the second end is located is used as a radiator of a second antenna. One of two first filters is connected between the first antenna radio frequency source and an antenna feed point, and the other first filter is connected between a ground and an antenna ground point. One of two second filters is connected between the second antenna radio frequency source and at least one of the first radiator section or the second radiator section, and the other second filter is connected between the ground and at least one of the first radiator section or the second radiator section.

Antenna system and electronic device

This application provides an antenna unit and an electronic device. A signal at a C-mode port and a signal at a D-mode port of a same loop antenna in any antenna unit are respectively excited by using two feeds, and the antenna unit is electrically symmetrically disposed, so that the signal at the C-mode port is self-cancelled at the D-mode port, and the signal at the D-mode port is self-cancelled at the C-mode port, to implement signal isolation between the two ports and interference self-cancel, and the signal at the C-mode port and the signal at the D-mode port can be complementary to each other in different radiation directions, to implement two antennas with high isolation and a low envelope correlation coefficient ECC based on the same loop antenna.

Antenna unit and electronic device

A foldable electronic device includes a first housing and a second housing that are rotationally connected to each other by means of rotating shafts located on two sides, and an antenna. The first housing can switch between an unfolded state and a folded state relative to the second housing, and the antenna is disposed in a closed slot. The antenna includes a first antenna segment and a second antenna segment that are sequentially connected and disposed in a length direction of the antenna. One end of the first antenna segment is connected to a ground plate of the first housing. The first antenna segment extends from one end toward a direction in which an opening/closing region of the first housing and the second housing in the unfolded state is away from the first housing.

Antenna for foldable electronic device and foldable electronic device

An antenna assembly and a mobile terminal include a first grounding part and a second grounding part and a slot, the first grounding part and the second grounding part are separated by the slot; at least a part of a first feed line is located in the slot or is located in a directly opposite position of the slot, the first feed line is configured to feed the first grounding part and electrically connected to the first grounding part; at least a part of a second feed line is located in the slot or is located in a directly opposite position of the slot, the second feed line is configured to feed one of the first grounding part and the second grounding part, and electrically connected to the other of the first grounding part and the second grounding part.

Antenna assembly and mobile terminal

A multi-phase coupled inductor includes at least three windings between a first plane and a second plane and a magnetic core that includes a first magnetic core, a second magnetic core and at least three magnetic core pillars, the first and second magnetic cores are respectively located at two ends of the windings, the magnetic core pillars connect the first and second magnetic cores and form at least three magnetic core units together with the first and second magnetic cores. The magnetic core units and the windings are arranged correspondingly on a one-to-one basis, the magnetic core units surround the corresponding windings and extend from the first plane to the second plane in a same direction, and projections of the at least three magnetic core units on the first plane enclose at least three enclosed areas which correspond to the windings on a one-to-one basis.

Multi-phase coupled inductor and manufacturing method thereof

This application provides a power supply system for a motor control module and a vehicle. The power supply system includes a first current limiting unit and an isolation unit. An output end of a first direct current power supply is coupled to a first input end of the isolation unit to form a first power supply loop with the isolation unit. A first output end of a second direct current power supply is coupled to one end of the first current limiting unit. Another end of the first current limiting unit is coupled to a second input end of the isolation unit to form a second power supply loop with the isolation unit. The second power supply loop is connected in parallel to the first power supply loop.

Power supply system of motor control module and vehicle

A motor control system and a vehicle reliably perform a three-phase active short circuit on a motor when a single-point power source fails. The motor control system includes a bus capacitor and a motor. The motor is connected to a positive direct current bus and a negative direct current bus through three phases of inverter bridges, the positive direct current bus and the negative direct current bus are respectively connected to a positive terminal and a negative terminal of the bus capacitor, and each phase of inverter bridge includes an upper bridge arm connected to the positive direct current bus and a lower bridge arm connected to the negative direct current bus. In addition, the motor control system further includes: an upper gate drive circuit, a lower gate drive circuit, a first power supply unit, and a second power supply unit.

Motor control system and vehicle

The invention provides a conversion circuit for converting input voltage into output voltage, including: a full-wave rectifier circuit including first and second branches connected in parallel, and each including a secondary winding and a rectifier switch; a first switch branch connected to midpoint of the first branch, and including first to fourth switches connected in series; a first resonant unit connected between connection node of the first and second switches and midpoint of the second branch; a second resonant unit connected between connection node of the third and fourth switches and midpoint of the second branch; a first primary winding connected in series to the first resonant unit; and a capacitor connected between connection node of the second and third switches and midpoint of the second branch. The conversion circuit of the invention improves conversion efficiency while maintaining smaller voltage stress on switches.

Conversion circuit topology

The invention provides a conversion circuit for converting input voltage into output voltage, including: a full-bridge rectifier circuit including first and second bridge arms connected in parallel and electrically connected between first and second ends of the output voltage; a first switch branch electrically connected between the first end of the input voltage and the first end of the output voltage, and including first and second switches connected in series to form a first connection node; a first resonant unit electrically connected between the first connection point and midpoint of the first bridge arm; and a first transformer including a first primary winding connected in series with the first resonant unit; and a first secondary winding connected between midpoint of the first bridge arm and midpoint of the second bridge arm. The conversion circuit of the invention improves conversion efficiency while maintaining smaller voltage stress on switches.

The invention provides a conversion circuit for converting an input voltage into an output voltage, including: a first full-wave rectifier circuit including a first branch and a second branch connected in parallel, each including a winding and a rectifier switch connected in series to form a midpoint; a first switch branch including a first switch and a second switch connected in series to form a first connection node; and a first resonant unit connected between the first connection node and a midpoint of the second branch, wherein the first resonant unit is not connected in series to the windings of the transformer. The conversion circuit of the invention improves conversion efficiency while maintaining smaller voltage stress on switches.

The present disclosure relates to the field of power electronic technology, provides a magnetic unit, including: a magnetic core and a winding, the magnetic core includes Q magnetic legs arranged in a row, where Q is a natural number and Q&#x2265;2, and the winding includes a first winding and a second winding, where the first winding is magnetically coupled with the second winding, and the first winding is wound around the Q magnetic legs while the second winding is wound around the Q magnetic legs. The first winding between any two adjacent magnetic legs is generally symmetrically disposed at both sides of the symmetric plane between the any two adjacent magnetic legs, thereby the magnetomotive force (MMF) distribution between any two adjacent magnetic legs is uniform.

Magnetic unit

A preparation method of indium oxide with stable morphology includes: (1) mixing indium oxide powder and bismuth oxide powder according to a mass ratio of 1:0.1-0.5 to obtain a powder mixture; (2) putting the powder mixture into a ball mill for ball milling at room temperature to obtain a uniform powder mixture; (3) putting the obtained uniform powder mixture into a muffle furnace and calcining at 700-1000&#xb0; C.; and (4) obtaining the indium oxide with cubic stable morphology after the muffle furnace naturally cools to room temperature. The method has advantages of simple synthesis process, short synthesis period, high sample yield, no need of complicated equipment, and morphology of the obtained indium oxide can be maintained after being heated at a high temperature within 1000&#xb0; C. for 2 hours. An electrochemical sensor prepared by using the indium oxide obtained by the method has better selectivity to nonane.

Preparation method of indium oxide with stable morphology and application thereof

The present disclosure provides a control method of a voltage conversion circuit. The voltage conversion circuit includes a DC voltage input terminal, a primary side switch unit, a resonant inductance, a transformer, a secondary side switch unit and a DC voltage output terminal which are electrically coupled. The resonant inductance is connected to the transformer in series. The voltage conversion circuit also includes a resonant capacitance which resonates with the resonant inductance. The control method includes: controlling switch elements in the primary side switch unit and the secondary side switch unit, so that a range of a ratio Ton/Tr of a total conduction time Ton to a resonant period Tr of the voltage conversion circuit is (0, 1.8)U(2.7, 3.7)U(4.8, 5.5), and a quality factor Q of the voltage conversion circuit is less than or equal to 5, that is, Q&#x2264;5. The control method provided by the embodiment of the present disclosure can reduce the conduction loss and the switching loss of the voltage conversion circuit, thereby improving the efficiency and reducing the cost.

Voltage conversion circuit and control method thereof

A multilayer polymeric film includes a top layer comprising poly(methyl methacrylate); a bottom layer comprising a bottom layer composition comprising poly(methyl methacrylate), polycarbonate, copolymers thereof, or a combination comprising at least one of the foregoing, wherein a glass transition temperature of the bottom layer composition is less than or equal to 140&#xb0; C.; and an inner layer disposed between an inside surface of the top layer and an inside surface of the bottom layer, wherein the inner layer comprises polycarbonate.

Multilayer polymeric films and the methods of making thereof

A dual band communication method and a wireless local area network (WLAN) device, First determining a service type of a service in a switching period according to a preset policy, where the switching period includes one first timeslot in which a first radio frequency (RF) channel works and one adjacent second timeslot in which a second RF channel works, and determining, according to the determined service type and a preset service quality requirement corresponding to the service type, maximum duration of the switching period in which the service quality requirement is met, and when time division multiplexing (TDM) is performed on a baseband processor, controlling the switching between the first RF channel and the second RF channel according to the maximum duration, hence actual duration of the switching period is less than or equal to the maximum duration.

Dual band communication method and WLAN device

Growing community of inventors

Shanghai, China

Yuan Zhou