公开(公告)号：US20220340024A1

公开(公告)日：2022-10-27

申请号：US17840963

申请日：2022-06-15

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Shuangquan CHEN ,  Zhixian WU ,  Yunhe MAO ,  Xiaosheng ZENG ,  Hongcheng YOU

IPC: B60L53/122 ,  H02J50/12 ,  B60L53/62

Abstract: A transmit end, a receive end, a method, and a system for wireless charging are provided, and are applied to the field of electric vehicles. A transmit-end controller compares an actual output current of an inverter with a preset upper limit value of an output current of the inverter and controls an output voltage of the inverter based on a comparison result to adjust a current of a transmit coil. A receive-end controller receives a sampled value of the current of the transmit coil that is sent by the transmit-end controller and updates a reference value of the current of the transmit coil when a difference between the sampled value of the current of the transmit coil and the reference value of the current of the transmit coil is greater than or equal to a preset value.

公开(公告)号：US20220069638A1

公开(公告)日：2022-03-03

申请号：US17502243

申请日：2021-10-15

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xiaosheng ZENG ,  Yunhe MAO ,  Shuangquan CHEN ,  Qitang LIU

IPC: H02J50/90 ,  H02J50/12 ,  B60L53/12 ,  B60L53/38

Abstract: The technology of this disclosure relates to a wireless charging alignment method and apparatus, a wireless charging system, and an electric vehicle, and belongs to the field of wireless charging. In the wireless charging alignment apparatus, a first detection circuit may detect a first induction signal of a power receive coil in a positioning magnetic field generated by a power transmit coil; a second detection circuit may detect a second induction signal of a location detection coil in the positioning magnetic field; and a location determining circuit may determine a location of the power receive coil relative to the power transmit coil based on the first induction signal and the second induction signal.

公开(公告)号：US20210083510A1

公开(公告)日：2021-03-18

申请号：US17105120

申请日：2020-11-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Qitang LIU ,  Xiaosheng ZENG ,  Shuangke LIU ,  Chengbin MA

IPC: H02J50/05 ,  H02J50/80 ,  H03F3/217

Abstract: This application provides a wireless charger and a control method. The wireless charger includes a class-E power amplifier and a tunable impedance circuit that is connected to an output end of the class-E power amplifier. The class-E power amplifier includes a switching transistor and a tunable capacitance circuit that is parallelly connected to the switching transistor. The wireless charger further includes a control unit, configured to obtain a constraint condition of the class-E power amplifier; determine N1 target equivalent load impedances of the class-E power amplifier based on the constraint condition; and adjust a capacitance value of the tunable capacitance circuit in the class-E power amplifier, and adjust an impedance value of the tunable impedance circuit, to enable an equivalent load impedance of the class-E power amplifier to match one of the N1 target equivalent load impedances.

公开(公告)号：US20230179030A1

公开(公告)日：2023-06-08

申请号：US18154217

申请日：2023-01-13

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Hongcheng YOU ,  Xiaosheng ZENG ,  Yunhe MAO ,  Zhixian WU ,  Shuangquan CHEN ,  Yanding LIU

IPC: H02J50/90 ,  B60L53/122 ,  H02J50/12

CPC classification number: H02J50/90 ,  B60L53/122 ,  H02J50/12

Abstract: Example positioning system based on a low frequency magnetic field and apparatus are described. One example positioning system includes a low frequency magnetic field transmit apparatus and a low frequency magnetic field receive apparatus. The transmit apparatus includes a transmit coil, a conflict detect coil, and a magnetic field generation detection control module. The receive apparatus includes a receive coil and a magnetic field detection control module. When the conflict detect coil does not sense a low frequency magnetic field signal, the magnetic field generation detection control module controls the transmit coil to transmit a first low frequency magnetic field signal. When the received low frequency magnetic field signal is the first low frequency magnetic field signal, the magnetic field detection control module determines relative positions of the transmit coil and the receive coil based on signal strength of the first low frequency magnetic field signal.

公开(公告)号：US20220337100A1

公开(公告)日：2022-10-20

申请号：US17853424

申请日：2022-06-29

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiaosheng ZENG ,  Zhixian WU ,  Yunhe MAO ,  Shuangquan CHEN

IPC: H02J50/80 ,  H02J50/10 ,  H02J7/00 ,  B60L55/00 ,  B60L53/126

Abstract: This application provides a frequency locking method, a wireless charging system, a receiving device, and a transmitting device for determining, through interaction between the receiving device and the transmitting device in a wireless charging scenario, whether a frequency locking procedure can be performed between the transmitting device and the receiving device. The receiving device includes: a controller, configured to control short-circuiting of an input terminal of a rectifier; a transceiver, configured to transmit a frequency locking request to the transmitting device, where the frequency locking request carries information about a first preset range, and the frequency locking request requests the transmitting device to generate an emission current whose frequency is within the first preset range; a receiving module, configured to obtain an input current of the rectifier based on the emission current; and a detector, configured to detect a frequency of the input current.

公开(公告)号：US20210305904A1

公开(公告)日：2021-09-30

申请号：US17345189

申请日：2021-06-11

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yunhe MAO ,  Zhixian WU ,  Xiaosheng ZENG

IPC: H02M3/335 ,  H02J50/12 ,  B60L53/122 ,  H02M1/08

Abstract: This application discloses a phase alignment circuit and method of a receive end, and a receive end, where the phase alignment circuit and method of a receive end. The receive end is located on the electric vehicle. The circuit includes: a phase measurement circuit and a controller. The controller is configured to: use, as an actual phase shift angle, a result obtained by subtracting the phase difference from a preset phase shift angle, and control a phase of a bridge arm voltage of the rectifier to lag behind the phase of the input current fundamental component by the actual phase shift angle. The controller outputs a drive signal for a controllable switching transistor of the rectifier by using the actual phase shift angle. Because a lagging phase caused due to filtering is compensated for, precision of synchronization between the bridge arm voltage and the input current can be increased.

公开(公告)号：US20210126544A1

公开(公告)日：2021-04-29

申请号：US17137786

申请日：2020-12-30

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yunhe MAO ,  Zhixian WU ,  Xiaosheng ZENG

IPC: H02M3/335 ,  H02J50/12 ,  B60L53/122 ,  H02M1/08

Abstract: This application discloses a phase alignment circuit and a method of a receive end, and a receive end. The receive end is located on an electric vehicle. The phase alignment circuit includes a phase measurement circuit and a controller. The controller is configured to: use, as an actual phase shift angle, a result obtained by subtracting a phase difference from a preset phase shift angle, and control a phase of a bridge arm voltage of a rectifier to lag behind the phase of the input current fundamental component by the actual phase shift angle. The controller outputs a drive signal for a controllable switching transistor of the rectifier by using the actual phase shift angle. Because a lagging phase caused due to filtering is compensated for, precision of synchronization between the bridge arm voltage and the input current can be increased.