公开(公告)号：US20230341904A1

公开(公告)日：2023-10-26

申请号：US17799499

申请日：2020-12-10

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiao Liang ,  Jie Wang ,  Fangcheng Liu ,  Fuguo Xu ,  Miao Zheng ,  Qichun Gong

IPC: G06F1/16 ,  H04M1/02 ,  H10K59/80

CPC classification number: G06F1/1656 ,  G06F1/1652 ,  H04M1/0268 ,  H10K59/8793 ,  H10K59/87 ,  H10K2102/311

Abstract: This application provides a flexible screen cover. The flexible screen cover includes a protective layer, a main layer, and a buffer layer. A modulus ratio of the main layer to the buffer layer is 8 to 180000. The buffer layer can be disposed at any proper position in the flexible screen. A modulus ratio of an adjacent layer to a buffer layer is 2 to 500000. The collapsible electronic device includes a housing and a flexible screen, and the flexible screen is installed in the housing. This application can improve impact resistance performance of the flexible screen.

公开(公告)号：US11146181B2

公开(公告)日：2021-10-12

申请号：US16911600

申请日：2020-06-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fangcheng Liu ,  Kai Xin ,  Yunfeng Liu

IPC: H02M7/483 ,  H02M7/49 ,  H02S40/32

Abstract: A control method and apparatus for a single-phase five-level converter are provided. The method includes: obtaining a first-phase initial modulated wave and a second-phase initial modulated wave of the single-phase five-level converter; obtaining a first-level modulated wave, a second-level modulated wave, a third-level modulated wave, a fourth-level modulated wave, and a fifth-level modulated wave that are output by the single-phase five-level converter; calculating the first-level modulated wave, the second-level modulated wave, the third-level modulated wave, the fourth-level modulated wave, the fifth-level modulated wave, the first-phase initial modulated wave, and the second-phase initial modulated wave, to obtain a common-mode modulated wave of the single-phase five-level converter; and calculating the first-phase initial modulated wave, the second-phase initial modulated wave, and the common-mode modulated wave, to obtain a pulse-width modulated wave of the single-phase five-level converter. Implementing the embodiments of this application can increase a system response speed and improve system reliability.

公开(公告)号：US20180120368A1

公开(公告)日：2018-05-03

申请号：US15855396

申请日：2017-12-27

Applicant: Huawei Technologies Co., Ltd.

Inventor： Fangcheng Liu ,  Kai Xin

IPC: G01R31/08 ,  H02M1/084 ,  H02H1/00 ,  H02H7/122 ,  G01R27/26

CPC classification number: G01R31/086 ,  G01R27/16 ,  G01R27/26 ,  H02H1/0007 ,  H02H1/0092 ,  H02H7/1227 ,  H02J3/38 ,  H02M1/084 ,  H02M7/42 ,  H02M7/53875 ,  H02M2001/0009

Abstract: The present disclosure relates to the field of inverters, and to a method for detecting grid connection stability of an inverter and an inverter. The method includes: detecting a line voltage and a current of the alternating current port to obtain a first group of line voltage values and a first group of current values; detecting the line voltage and the current of the alternating current port to obtain a second group of line voltage values and a second group of current values; obtaining an equivalent impedance matrix of the power grid according to the first group of line voltage values, the first group of current values, the second group of line voltage values, and the second group of current values; and determining, by the inverter according to an equivalent admittance matrix and the equivalent impedance matrix, whether a stability requirement of the inverter is met.

公开(公告)号：US11563404B2

公开(公告)日：2023-01-24

申请号：US17035142

申请日：2020-09-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fangcheng Liu ,  Kai Xin ,  Xinyu Yu

IPC: H02S50/00 ,  H02S40/32

Abstract: One example method includes obtaining output powers at initial scanning points of photovoltaic strings in a first group and a second group. The output powers at the initial scan points of the photovoltaic strings in the first group can then be controlled to sequentially decrease, and the output powers at the initial scan points of the photovoltaic strings in the second group can then be controlled to sequentially increase. Scanning can then be performed in the initial scanning direction starting from output voltages corresponding to the output powers at the initial scan points of the first group. Scanning can then be performed in the initial scanning direction starting from output voltages corresponding to the output powers at the initial scan points of the second group, where output powers of the first group and the second group are kept to compensate each other during IV curve scanning.

公开(公告)号：US11223205B2

公开(公告)日：2022-01-11

申请号：US16833969

申请日：2020-03-30

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Hongwen Yuan ,  Fuqiang Xu ,  Fangcheng Liu

IPC: H02M7/493 ,  H02M1/08 ,  H02J3/38 ,  H02M7/48

Abstract: A method for synchronizing PWM control signals of inverters, an inverter, and a power grid system are disclosed, so that PWM control signals of inverters connected to a power grid can be synchronized. A direct current voltage terminal of the inverter is connected to an external power supply, and an alternating current voltage terminal of the inverter is connected to an alternating current point of common coupling of a power grid, and the method includes: obtaining a phase of an alternating current voltage of the power grid (S101); determining a time period during which the phase of the alternating current voltage varies within a preset phase threshold interval; calculating a period of a preset carrier wave based on a preset carrier wave ratio and the time period (S103); and generating a PWM control signal of the inverter based on a PWM modulation signal and a preset carrier wave (S105).

公开(公告)号：US11089189B2

公开(公告)日：2021-08-10

申请号：US16642309

申请日：2017-09-12

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fangcheng Liu ,  Dengfeng Li ,  Yingyong He ,  Yang Han ,  Lei Jiang ,  Jianwen Wang

IPC: H04N5/225 ,  G02B7/09 ,  H04M1/02

Abstract: A camera module includes a lens and a voice coil motor (VCM), and the lens is placed in the VCM, where a first portion of an inner side of the VCM is attached to a first portion of an outer side of the lens, and a second portion of the inner side of the VCM is provided with a screw thread structure recessed relative to the first portion of the inner side of the VCM. The screw thread structure and a second portion of the outer side of the lens form a groove portion, and the groove portion is filled with adhesive. The first portion of the VCM is a lower portion, and the second portion of the VCM is an upper portion. The first portion of the lens is a lower portion, and the second portion of the lens is an upper portion.

公开(公告)号：US11038512B2

公开(公告)日：2021-06-15

申请号：US17105029

申请日：2020-11-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Dongsheng Yang ,  Fangcheng Liu ,  Xiongfei Wang

IPC: H03L7/091 ,  H03L7/099

Abstract: Embodiments of this application provide a phase-locking apparatus and a phase-locking method. The phase-locking apparatus includes an amplitude adjustment unit, an amplitude and phase detector connected to the amplitude adjustment unit, a first loop filter connected to the amplitude and phase detector, a second loop filter connected to the amplitude and phase detector, a first oscillator connected to the first loop filter, and a second oscillator connected to the second loop filter. The amplitude adjustment unit, the amplitude and phase detector, the first loop filter, and the first oscillator form a loop; and the amplitude and phase detector, the second loop filter, and the second oscillator form another loop. According to the embodiments of this application, a dual-loop structure of the phase-locking apparatus can weaken frequency coupling between a positive-sequence component generated by the phase-locking apparatus and a negative-sequence component generated by the phase-locking apparatus.

公开(公告)号：US11693062B2

公开(公告)日：2023-07-04

申请号：US16913828

申请日：2020-06-26

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fangcheng Liu ,  Kai Xin ,  Yunfeng Liu

IPC: G01R31/52 ,  H02H7/20 ,  H02H1/00 ,  H02H3/33 ,  G01R31/00 ,  H02S50/00

CPC classification number: G01R31/52 ,  G01R31/00 ,  H02H1/0015 ,  H02H1/0092 ,  H02H3/33 ,  H02H7/20 ,  H02S50/00 ,  Y02E10/50

Abstract: A method for processing a direct current electric arc and an apparatus, includes: obtaining a first current which is a direct current input current of a direct current cable of a photovoltaic cell system; obtaining a second current, where the second current is a direct current common mode current of a direct current cable or an alternating current common mode current of an alternating current cable; calculating a correlation coefficient between a frequency domain component of the first current and a frequency domain component of the second current; and when determining that the first current meets an electric arc occurrence condition and the correlation coefficient is greater than or equal to a preset coefficient threshold, skipping sending a direct current electric arc fault alarm. The correlation coefficient is used to reflect a proportion of common mode noise generated by the second current, and the preset coefficient threshold is set.

公开(公告)号：US11133751B2

公开(公告)日：2021-09-28

申请号：US16692600

申请日：2019-11-22

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fangcheng Liu ,  Xiongfei Wang ,  Kai Xin

IPC: H02M7/23 ,  H02M1/12 ,  H02M5/458 ,  H02M7/49

Abstract: This application discloses an apparatus, an inverter system, and a method for synchronizing carriers. The apparatus includes a modulation unit, a current processing unit, and a control unit. The control unit can adjust, based on a change trend between an amplitude of a first harmonic current and an amplitude of a second harmonic current and a change trend between a phase of a first carrier and a phase of a second carrier, a phase of an input carrier input into the modulation unit, to decrease an amplitude of a harmonic current output by an inverter and improve stability of a distributed power supply system. Further, a prior-art problem that impact of a harmonic current on a power supply system cannot be reduced by synchronizing carriers in a process of synchronizing carriers based on a zero sequence current is avoided, thereby improving the stability of the distributed power supply system.

公开(公告)号：US10715056B2

公开(公告)日：2020-07-14

申请号：US16369828

申请日：2019-03-29

Applicant: Huawei Technologies Co., Ltd.

Inventor： Fangcheng Liu ,  Kai Xin ,  Haibin Guo

IPC: H02M7/537 ,  H02M7/5387 ,  H02S40/32 ,  H02P27/08 ,  H02M1/12 ,  H02J3/38 ,  H03H7/01 ,  H02M7/5395 ,  H02M7/487 ,  H02M1/00

Abstract: A three-phase converter configured to be coupled between a direct current system and an alternating current system to perform interconversion between a direct current and an alternating current, where the three-phase converter includes a switching network, a three-phase filter coupled to the switching network, a sampling circuit coupled to the three-phase filter, a control circuit coupled to the three-phase sampling circuit, an active damping circuit coupled to the control circuit and the sampling circuit, and a modulation circuit coupled between the active damping circuit and the switching network, where the sampling circuit is configured to obtain three-phase currents in the three-phase filter, and send the three-phase currents to the active damping circuit, the active damping circuit is configured to obtain new three-phase modulated waves according to the three-phase currents, and transmit the new three-phase modulated waves to the modulation circuit.