公开(公告)号：US20220416586A1

公开(公告)日：2022-12-29

申请号：US17850325

申请日：2022-06-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Chunsen TANG ,  Zhihui WANG ,  Yaoyi WANG ,  Pengfei BAI ,  Zhenzhen WANG ,  Jiakai CAO ,  Wei KUANG ,  Zhixian WU

IPC: H02J50/60 ,  H02J50/00 ,  H02J50/10 ,  B60L53/124

Abstract: This application provides a foreign object detection method and apparatus, and a wireless charging system. The foreign object detection apparatus includes a coil array and a foreign object detection circuit. The coil array includes at least one coil group, and each coil group includes four detection coils whose locations are symmetrical to each other. The foreign object detection circuit determine an abnormal-value threshold of each coil group based on induction signals of each coil group and that are obtained in a first time period, and detect, based on the abnormal-value threshold and the induction signals of each coil group, whether there is a foreign object; when it is determined that there is no foreign object, detect, based on the signal threshold of each coil group and induction signals that are of each coil group and that are obtained in a second time period, whether there is a foreign object.

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：US20190068068A1

公开(公告)日：2019-02-28

申请号：US16172082

申请日：2018-10-26

Applicant: Huawei Technologies Co., Ltd.

Inventor： Ce LIU ,  Zhixian WU

IPC: H02M3/335 ,  H02M1/08

Abstract: A resonant power converter and a frequency tracking method for a resonant power converter are disclosed to determine a resonant status of the resonant power converter by sampling a secondary current, thereby controlling frequency of a drive signal. Therefore, the frequency of the drive signal tracks resonant frequency of the resonant power converter. The resonant power converter includes an inverter branch, which connected to the inverter branch, a transformer connected to the resonant branch, and a rectification and filtering branch connected to the transformer. A primary side of the transformer is connected to the resonant branch, and a secondary side of the transformer is connected to the rectification and filtering branch. A detection branch is connected to both the secondary side of the transformer and the rectification and filtering branch.

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.

公开(公告)号：US20220255358A1

公开(公告)日：2022-08-11

申请号：US17732713

申请日：2022-04-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yunhe MAO ,  Zhixian WU ,  Yanding LIU

IPC: H02J50/12 ,  H02J50/80 ,  H02J7/00 ,  H02M7/217 ,  B60L53/126

Abstract: A wireless charging receiver, system, and control method, and relates to the field of wireless charging technologies are disclosed. A receiver coil of the receiver converts an alternating magnetic field transmitted by a transmitter to an alternating current, and delivers the alternating current to a compensation network. The compensation network compensates the alternating current, and then delivers the compensated alternating current to a rectifier. The rectifier rectifies the compensated alternating current to a direct current, and supplies the direct current to a load. The compensation network is a compensation circuit with a current source characteristic, so that the receiver coil and the compensation network, acting together with the transmitter, make an input end of the rectifier a constant current source.

公开(公告)号：US20220250487A1

公开(公告)日：2022-08-11

申请号：US17733447

申请日：2022-04-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yunhe MAO ,  Zhixian WU

IPC: B60L53/12 ,  H02J50/80 ,  H02J50/10 ,  H02J7/02

Abstract: A wireless charging receive end, system, and control method, and relates to the field of wireless charging technologies is provided. The wireless charging receive end includes a receiver coil, a compensation network, a power converter, and a receive end controller. The receiver coil converts an alternating magnetic field transmitted by a transmit end into an alternating current and transmits the alternating current to the compensation network. The compensation network compensates for the alternating current and then transmit a compensated alternating current to the power converter. The power converter rectifies the compensated alternating current into a direct current for charging a load. The receive end controller obtains a reference signal at the transmit end based on an input current of the power converter and an input reference current, and sends the reference signal at the transmit end to a transmit end controller.

公开(公告)号：US20190315246A1

公开(公告)日：2019-10-17

申请号：US16455183

申请日：2019-06-27

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yingtao LI ,  Pinghua WANG ,  Zhixian WU

IPC: B60L53/66 ,  B60L53/12 ,  B60L53/65 ,  H02J7/02 ,  H02J50/90 ,  H02J50/80 ,  H02J50/12 ,  H02J50/20

Abstract: The present application relates to the field of automotive technologies, and provides an electric vehicle wireless charging method, an apparatus, and a system. A wireless charging station can charge an electric vehicle according to a charging request of the electric vehicle and charging permission of the electric vehicle prestored on the wireless charging station, so that resources of the wireless charging station are maximally used, and resource waste of the wireless charging station is avoided.