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    POWER CONVERTER AND DETECTION METHOD FOR TERMINAL STATUS
    1.
    发明申请
    POWER CONVERTER AND DETECTION METHOD FOR TERMINAL STATUS 有权

    公开(公告)号：US20250023456A1

    公开(公告)日：2025-01-16

    申请号：US18899666

    申请日：2024-09-27

    Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

    Inventor： Yuan YAO ,  Xinyu YU ,  Kai XIN ,  Zhaoqi CAI

    IPC: H02M1/32 ,  H02J3/00 ,  H02J3/38

    Abstract: Example power converters and detection methods are described. One example power converter includes a control device, a plurality of wiring terminals, a power conversion circuit, and a plurality of temperature detection devices. The control device is configured to: when an absolute value of a difference between a temperature value of one wiring terminal in the plurality of wiring terminals and a first reference temperature value is greater than or equal to a first temperature difference threshold, output a signal indicating that an abnormality occurs in the plurality of wiring terminals. In this application, a relative change of a temperature of one wiring terminal relative to another wiring terminal can be directly determined based on temperature values of the plurality of wiring terminals, thereby quickly determining, based on a magnitude of the relative change, whether there is an abnormal temperature rise caused by loose connections in the plurality of wiring terminals.

    POWER SUPPLY SYSTEM AND CURRENT CONVERSION METHOD
    2.
    发明公开
    POWER SUPPLY SYSTEM AND CURRENT CONVERSION METHOD 审中-公开

    公开(公告)号：US20240305099A1

    公开(公告)日：2024-09-12

    申请号：US18668538

    申请日：2024-05-20

    Applicant: Huawei Digital Power Technologies Co., Ltd.

    Inventor： Zhangping SHAO ,  Kai XIN ,  You ZHOU

    IPC: H02J3/18 ,  H02J3/38

    CPC classification number: H02J3/1835 ,  H02J3/38 ,  H02J2300/24 ,  H02J2300/28

    Abstract: A converter circuit is configured to output a first reactive current to a power grid when a voltage value of an output port of the converter circuit decreases from a first working voltage value to a second working voltage value. The drive control circuit is configured to: in a process in which the converter circuit outputs the first reactive current to the power grid, when it is detected that the voltage value of the output port of the converter circuit increases to a third working voltage value and the third working voltage value is greater than or equal to a first recovery voltage value, control the converter circuit to output a second reactive current to the power grid, to recover the voltage value of the output port of the converter circuit to the first working voltage value.

    RESONANT SWITCHED CAPACITOR CONVERTER AND CONTROL METHOD THEREOF
    3.
    发明公开
    RESONANT SWITCHED CAPACITOR CONVERTER AND CONTROL METHOD THEREOF 审中-公开

    公开(公告)号：US20240088785A1

    公开(公告)日：2024-03-14

    申请号：US18517117

    申请日：2023-11-22

    Applicant: Huawei Digital Power Technologies Co., Ltd.

    Inventor： Xinyu YU ,  Yunfeng LIU ,  Kai XIN ,  Fuqiang XU

    IPC: H02M3/07 ,  H02J3/38 ,  H02M7/487 ,  H02M7/493

    CPC classification number: H02M3/07 ,  H02J3/381 ,  H02M7/487 ,  H02M7/493 ,  H02J2300/26 ,  H02M1/0054

    Abstract: The embodiments provide an RSCC and a control method thereof. The RSCC includes an input capacitor, an output capacitor, N parallel RSC branches, and a controller. The controller is configured to: determine an average value of characteristic currents of N resonance units; and reduce a duty cycle of a control signal of a charging switch in a first switch unit when determining that a characteristic current of a first resonance unit is greater than the average value, where a corresponding branch is in a charging stage when the charging switch is turned on; or reduce a duty cycle of a control signal of a discharging switch in a first switch unit when determining that a characteristic current of a first resonance unit is less than the average value, where a corresponding branch is in a discharging stage when the discharging switch is turned on.

    ON-GRID/OFF-GRID MODE SWITCHING METHOD AND ENERGY STORAGE SYSTEM
    4.
    发明公开
    ON-GRID/OFF-GRID MODE SWITCHING METHOD AND ENERGY STORAGE SYSTEM 审中-公开

    公开(公告)号：US20240022082A1

    公开(公告)日：2024-01-18

    申请号：US18471694

    申请日：2023-09-21

    Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

    Inventor： Mingxuan DONG ,  Kai XIN

    IPC: H02J3/38 ,  H02J3/00 ,  G05B17/02

    CPC classification number: H02J3/388 ,  H02J3/001 ,  G05B17/02

    Abstract: This application provides an energy storage system, including a controller, an inverter, an on-grid/off-grid mode switch, and a load. The inverter is configured to: in response to determining that, the energy storage system is in an islanding state, freeze an output frequency of the inverter based on a preset frequency, and control an output current of the inverter based on an association relationship that an output voltage of the inverter is negatively correlated with apparent power of the inverter. The controller is configured to send a disconnection instruction to the on-grid/off-grid mode switch. The controller is further configured to send a switching instruction to the inverter in response to receiving a disconnection complete message from the on-grid/off-grid mode switch. The inverter is further configured to switch to a voltage source mode in response to determining that the output voltage of the inverter meets the preset range of the rated voltage.

    COMMON-MODE VOLTAGE ADJUSTMENT METHOD AND APPARATUS, AND CONTROL SYSTEM
    5.
    发明公开
    COMMON-MODE VOLTAGE ADJUSTMENT METHOD AND APPARATUS, AND CONTROL SYSTEM 审中-公开

    公开(公告)号：US20230402941A1

    公开(公告)日：2023-12-14

    申请号：US18454581

    申请日：2023-08-23

    Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

    Inventor： Xinyu YU ,  Kai XIN ,  Haibin GUO ,  Fuqiang XU

    IPC: H02M7/5388 ,  H02M1/12 ,  H02M1/14 ,  H02M7/483

    CPC classification number: H02M7/5388 ,  H02M1/12 ,  H02M1/14 ,  H02M7/483

    Abstract: This application discloses a common-mode voltage adjustment method and apparatus, and a control system, and relates to the field of electronic technologies. In an example method, a controller generates an injection instruction of a first common-mode voltage based on a first modulation scheme, generates an injection instruction of a second common-mode voltage based on a second modulation scheme, and generates an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period. The injection instruction of the third common-mode voltage may be used to control a inverter circuit to output the third common-mode voltage.

    PHOTOVOLTAIC POWER GENERATION SYSTEM, PHOTOVOLTAIC INVERTER, AND IV CURVE SCANNING METHOD
    6.
    发明公开
    PHOTOVOLTAIC POWER GENERATION SYSTEM, PHOTOVOLTAIC INVERTER, AND IV CURVE SCANNING METHOD 审中-公开

    公开(公告)号：US20230291208A1

    公开(公告)日：2023-09-14

    申请号：US18316387

    申请日：2023-05-12

    Applicant: Huawei Digital Power Technologies Co., Ltd.

    Inventor： Xinyu YU ,  Kai XIN ,  Jianqiang WANG ,  Song WAN

    IPC: H02J3/46 ,  H02S50/10 ,  H02J3/00

    CPC classification number: H02J3/46 ,  H02S50/10 ,  H02J3/0012 ,  H02J2300/26

    Abstract: The photovoltaic power generation system includes a controller and M groups of DC-DC circuits. Each group of DC-DC circuits include N DC-DC circuits, where M is a positive integer, and N is an integer greater than 1. An input end of each DC-DC circuit is connected to at least one photovoltaic unit, and each photovoltaic unit includes at least one photovoltaic module. The controller controls the N DC-DC circuits in each group of DC-DC circuits to sequentially start online IV curve scanning and controls a time interval at which two adjacent DC-DC circuits start online IV curve scanning to be less than duration of online IV curve scanning performed by one DC-DC circuit. The photovoltaic power generation system can reduce a fluctuation of a power output during online IV curve scanning, reduce duration of online IV curve scanning performed by the photovoltaic power generation system.

    MULTI-INVERTER PARALLEL SYSTEM AND METHOD FOR CONTROLLING GRID CONNECTION OF INVERTER
    9.
    发明公开
    MULTI-INVERTER PARALLEL SYSTEM AND METHOD FOR CONTROLLING GRID CONNECTION OF INVERTER 审中-公开

    公开(公告)号：US20240106351A1

    公开(公告)日：2024-03-28

    申请号：US18523539

    申请日：2023-11-29

    Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

    Inventor： Xinyu YU ,  Junjie LI ,  Kai XIN

    IPC: H02M7/5387 ,  H02M1/00 ,  H02M1/12 ,  H02M7/5395

    CPC classification number: H02M7/53871 ,  H02M1/0067 ,  H02M1/123 ,  H02M7/5395

    Abstract: A multi-inverter parallel system are provided. The system includes a first inverter and a second inverter. The first inverter includes a first controller, a first inverter circuit, and a first relay. The second inverter includes a second controller, a second inverter circuit, and a second relay. Phases of an output end of the first inverter circuit are correspondingly connected to phases of an output end of the second inverter circuit. The first controller may control the first relay to be turned on. The second controller may control, when the second relay is turned off, a direct current bus voltage of the second inverter circuit to be the same as a direct current bus voltage of the first inverter circuit, and control a common-mode voltage injection manner of the second inverter circuit to be the same as a common-mode voltage injection manner of the first inverter circuit.

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