公开(公告)号：US20230095057A1

公开(公告)日：2023-03-30

申请号：US18074172

申请日：2022-12-02

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fei XU ,  Yongbing GAO ,  Guoping FAN

IPC: H02J3/32 ,  H02M3/158 ,  H02S40/32 ,  H02J3/46 ,  H02M7/797 ,  H02J3/38

Abstract: This application provides a photovoltaic power generation system. The system includes at least one first photovoltaic module, a photovoltaic inverter, a first two-way DC/DC converter, and at least one first energy storage unit, and further includes at least one second photovoltaic module or at least one second energy storage unit. The photovoltaic inverter includes a DC/DC converter and a DC-AC inverter, where the DC/DC converter is electrically connected to the at least one first photovoltaic module, and the DC/DC converter is connected to the DC-AC inverter through a direct current bus. For the photovoltaic power generation system, photovoltaic arrays and energy storage devices can be configured flexibly to cope with peaks and troughs of power consumption.

公开(公告)号：US20220216690A1

公开(公告)日：2022-07-07

申请号：US17701940

申请日：2022-03-23

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yongbing GAO ,  Chen WANG ,  Tiansan LIN ,  Yang HU

IPC: H02H7/20 ,  H02J3/38 ,  H02H1/00

Abstract: A photovoltaic power generation system includes an inverter, a controller, and at least two direct current branch circuits. The leakage current detection apparatus is configured to: detect a leakage current of the direct current branch circuit on which the leakage current detection apparatus is located and send the leakage current to the controller. The controller is further configured to: when the photovoltaic power generation system runs and a value of a leakage current of the direct current branch circuit exceeds a preset range, determine that an insulation fault occurs on the direct current branch circuit. The system can determine the direct current branch circuit on which the insulation fault occurs in the photovoltaic power generation system, so that measures are taken in time for the direct current branch circuit on which the insulation fault occurs, to eliminate a potential safety hazard.

公开(公告)号：US20240047973A1

公开(公告)日：2024-02-08

申请号：US18489255

申请日：2023-10-18

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Dong CHEN ,  Yongbing GAO ,  Yunfeng LIU

IPC: H02J3/38 ,  H02J3/00 ,  H02M1/00 ,  H02M1/32 ,  H02S50/10

CPC classification number: H02J3/381 ,  H02J3/0012 ,  H02M1/0009 ,  H02M1/32 ,  H02S50/10 ,  H02J2300/26 ,  H02G3/08

Abstract: This application describes examples of a direct current combiner box, a photovoltaic power generation system, and a fault detection method. In one example, the direct current combiner box includes a fault detection unit, a protection circuit, and a boost circuit. The fault detection unit detects an operating parameter of the direct current combiner box. The protection circuit sends a protection signal to the boost circuit when the operating parameter meets a specified condition. The protection signal is used to enable the boost circuit to adjust a first voltage of a photovoltaic array at an input end of the direct current combiner box to a second voltage. After receiving the protection signal, the boost circuit adjusts the first voltage of the photovoltaic array at the input end of the direct current combiner box to the second voltage.

公开(公告)号：US20230208312A1

公开(公告)日：2023-06-29

申请号：US18175583

申请日：2023-02-28

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yongbing GAO ,  Yunyu TANG ,  Lei SHI

IPC: H02M7/48 ,  H02J3/38 ,  H02M3/04 ,  H02M1/08 ,  H02M1/32 ,  H02S40/32 ,  H02S40/36

CPC classification number: H02M7/48 ,  H02J3/381 ,  H02M1/32 ,  H02M1/083 ,  H02M3/04 ,  H02S40/32 ,  H02S40/36 ,  H02J2300/24

Abstract: A converter includes a power conversion circuit, a switching device, and a controller, and includes N phases, where N is 2 or 3. An input end of the power conversion circuit is connected to a direct current power supply, and the power conversion circuit converts a direct current output by the direct current power supply into an alternating current. The switching device includes at least the following two stages: a first-stage switching device and a second-stage switching device. The first-stage switching device and the second-stage switching device separately include N switches, and the N switches are connected in series to the N phases respectively. An output end of the power conversion circuit is connected to an alternating current power grid through the first-stage switching device and the second-stage switching device that are connected in series.

公开(公告)号：US20220311246A1

公开(公告)日：2022-09-29

申请号：US17704120

申请日：2022-03-25

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xiaoqian MENG ,  Haibin GUO ,  Yongbing GAO

IPC: H02J3/38 ,  H02S40/32 ,  H02M7/537

Abstract: A photovoltaic system and a leakage current control method for the photovoltaic system includes at least one photovoltaic module group, at least one photovoltaic inverter, a grounded metal frame, and a sampling control unit. The photovoltaic module group is mounted on the grounded metal frame. An output end of the photovoltaic module group is connected to an input end of the photovoltaic inverter, and an output end of the photovoltaic inverter is connected to a power grid. The sampling control unit is coupled to both the photovoltaic module group and the photovoltaic inverter and is configured to detect a current value of a leakage current formed by a common-mode voltage of the photovoltaic inverter on a parasitic capacitor. Herein, the parasitic capacitor exists between the photovoltaic module group and the grounded metal frame.

公开(公告)号：US20220200290A1

公开(公告)日：2022-06-23

申请号：US17694085

申请日：2022-03-14

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yanzhong ZHANG ,  Yongbing GAO ,  Xun WANG ,  Roland HUEMPFNER

IPC: H02J3/38 ,  H02M7/44

Abstract: A power system is disclosed. Output terminals of a power supply or a DC-to-DC unit are cascaded to increase an output voltage, so as to reduce a current between the power supply or the DC-to-DC unit and the DC-to-AC unit, and resolve cost and loss problems of the cable from the power supply or the DC-to-DC unit to the DC-to-AC unit. In addition, according to the power system provided in the embodiments of this application, a quantity of cables from the power supply or the DC-to-DC unit to the DC-to-AC unit may be further reduced by cascading output terminals of the power supply or the DC-to-DC unit and cascading inputs of the DC-to-AC unit, thereby reducing system costs. In addition, in the power system provided in the embodiments of this application, cascaded input and isolated output of the DC-to-AC unit can reduce a specification of a power conversion device.

公开(公告)号：US20240297576A1

公开(公告)日：2024-09-05

申请号：US18582873

申请日：2024-02-21

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jinxiang ZHAN ,  Kai GAO ,  Juncan WANG ,  Yongbing GAO

IPC: H02M1/32 ,  H02J3/38 ,  H02M3/158

CPC classification number: H02M1/322 ,  H02M3/158 ,  H02J3/38 ,  H02J2300/24

Abstract: A power conversion device includes a positive direct current bus, a negative direct current bus, a first capacitor, a second capacitor, a first inductor, a first discharge unit. The first capacitor is connected between the positive direct current bus and the negative direct current bus. The second capacitor is connected in series to the first inductor and then connected in parallel to the first capacitor, where a capacitance value of the second capacitor is greater than a capacitance value of the first capacitor. The first discharge unit is connected in parallel to the first inductor, and is configured to be in a conducted state when a voltage of the first inductor is greater than a first action voltage threshold. In the embodiments, a case in which a semiconductor device in the power conversion device has a risk of voltage overstress caused by a differential mode lightning strike can be avoided.

公开(公告)号：US20230378908A1

公开(公告)日：2023-11-23

申请号：US18364669

申请日：2023-08-03

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jianfei LIN ,  Yongbing GAO ,  Tiansan LIN

IPC: H02S50/10 ,  H02J3/46 ,  H02S40/34 ,  G01R27/18

CPC classification number: H02S50/10 ,  H02J3/46 ,  H02S40/34 ,  G01R27/18 ,  H02J2300/26

Abstract: An impedance detection method and a photovoltaic system are provided to help reduce complexity and costs of impedance detection. The method includes: sampling a voltage between a direct current bus and a protective earthing at each of a first time point and a second time point, to obtain a first voltage value and a second voltage value; sampling a leakage current on the direct current bus at each of the first time point and the second time point, to obtain a first current value and a second current value; and calculating an insulation impedance value of a combiner box based on a difference between the first voltage value and the second voltage value and a difference between the first current value and the second current value, to determine whether impedance of the combiner box is abnormal.

公开(公告)号：US20230336119A1

公开(公告)日：2023-10-19

申请号：US18338770

申请日：2023-06-21

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Xinyu YU ,  Kai XIN ,  Peng DONG ,  Yongbing GAO ,  Yanzhong ZHANG

IPC: H02S40/34 ,  H02S40/32 ,  H02J3/38

CPC classification number: H02S40/32 ,  H02J3/381 ,  H02S40/34 ,  H02J2300/26

Abstract: An example system includes an inverter and at least one combiner box. The combiner box includes a plurality of direct current-direct current (DC-DC) circuits and one controller. The controller is configured to: when an output voltage of the combiner box is greater than or equal to a first preset voltage and less than or equal to a second preset voltage, control the combiner box to output a maximum power. When the output voltage of the combiner box is greater than the second preset voltage, the controller controls an output power of the combiner box to decrease as the output voltage increases. The second preset voltage is greater than the first preset voltage, and the maximum power is a sum of maximum powers of all photovoltaic strings connected to the combiner box.

公开(公告)号：US20230187884A1

公开(公告)日：2023-06-15

申请号：US18152898

申请日：2023-01-11

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xiufeng ZHANG ,  Yongbing GAO ,  Maofan LI ,  Xuedong DENG ,  He CHEN

IPC: H01R13/74 ,  H01R13/52 ,  H01R13/622 ,  H01R12/58 ,  H01R12/70

CPC classification number: H01R13/746 ,  H01R13/5202 ,  H01R13/622 ,  H01R12/58 ,  H01R12/707

Abstract: A connector and an electronic device, to resolve a problem of poor mountability of the connector. The connector includes a housing, a conductive core, and a fastening structure. The housing has a channel that passes through a first end and a second end of the housing. The conductive core is disposed in the channel. A solder leg is disposed on one end of the conductive core, and the solder leg protrudes from the first end of the housing and is configured to be soldered to a circuit board. The fastening structure is configured to fasten the housing to a panel. The conductive core may be directly soldered to the circuit board, so that a connection effect between the conductive core and the circuit board can be improved, and mounting steps can be reduced.