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公开(公告)号：US20200326385A1
公开(公告)日：2020-10-15
申请号：US16913828
申请日：2020-06-26
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Fangcheng LIU , Kai XIN , Yunfeng LIU
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.
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Patent Agency Ranking
公开(公告)号：US20200314298A1
公开(公告)日：2020-10-01
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
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.
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公开(公告)号：US20190280609A1
公开(公告)日：2019-09-12
申请号：US16426171
申请日：2019-05-30
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Fangcheng LIU , Kai XIN , Haibin GUO
IPC: H02M5/458
Abstract: A pulse width modulation method, a pulse width modulation system, and a controller are provided, which change a change rate of a common-mode component of a three-phase converter upon a change of a converter modulation degree, thereby improving stability and harmonic characteristics of the three-phase converter and implementing flexible adaptive adjustment. An example pulse width modulation method includes: obtaining initial three-phase modulation waves and a converter modulation degree; calculating a common-mode-component change-rate adjustment coefficient based on preset modulation parameters and the converter modulation degree; selecting a modulation wave having a minimum absolute value from the modulation wave set as a common-mode modulation wave; and performing waveform superposition on the initial three-phase modulation waves and the common-mode modulation wave to obtain output three-phase modulation waves.
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公开(公告)号：US20210083679A1
公开(公告)日：2021-03-18
申请号：US17105029
申请日：2020-11-25
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Dongsheng YANG , Fangcheng LIU , Xiongfei WANG
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.
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5.发明申请公开(公告)号：US20210058030A1
公开(公告)日：2021-02-25
申请号：US17035142
申请日：2020-09-28
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Fangcheng LIU , Kai XIN , Xinyu YU
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.
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公开(公告)号：US20200328697A1
公开(公告)日：2020-10-15
申请号：US16911600
申请日：2020-06-25
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Fangcheng LIU , Kai XIN , Yunfeng LIU
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.
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