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公开(公告)号：US20240213767A1
公开(公告)日：2024-06-27
申请号：US18598117
申请日：2024-03-07
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Li LU , Kai XIN , Xinyu YU , Yunfeng LIU
IPC: H02H7/20 , G01R19/165 , H02J3/00 , H02J3/38 , H02S50/10
CPC classification number: H02H7/20 , G01R19/1658 , H02J3/001 , H02J3/38 , H02S50/10 , H02J2300/24
Abstract: A photovoltaic system, a relay detection method, and a power supply system. When a fault, for example, sticking of the relay is detected, the controller stops sending a PWM driver gating signal to the inverter, and stops driving of a switch transistor in the inverter, and the inverter stops outputting power, and then determines whether a voltage difference between two ends of the relay is greater than a preset value, to determine whether the relay is faulty. The controller stops sending the PWM driver gating signal to the inverter only within a preset phase range of a voltage of the filter capacitor, to ensure that the voltage of the filter capacitor has a large value. Because the voltage of the filter capacitor is large, an alternating current grid-to-ground voltage is pulled up, to avoid detecting the fault as an alternating current grid-to-ground short circuit.
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公开(公告)号：US20240128739A1
公开(公告)日：2024-04-18
申请号：US18398769
申请日：2023-12-28
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Li LU , Kai XIN , Xinyu YU , Boping YANG
Abstract: The photovoltaic system includes an inverter, a fan, and a controller. A photovoltaic string and a direct current bus capacitor are connected between a positive input end and negative input end of the inverter. The controller receives a fast shutdown instruction and sends a drive signal to a switching transistor in the inverter, so that the switching transistor performs a switching action under the action of the drive signal, and the switching transistor consumes electric energy during the switching action; or the controller turns on the fan after receiving the fast shutdown instruction to consume electric energy by using the fan; or the controller may send the drive signal to the switching transistor and also control the fan to be turned on, so that both the switching transistor and the fan consume electric energy.
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Patent Agency Ranking
33.发明公开公开(公告)号：US20240048179A1
公开(公告)日：2024-02-08
申请号：US18488161
申请日：2023-10-17
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu YU , Fuqiang XU , Kai XIN , Peng DONG
Abstract: A power line communication (PLC) system includes a PLC signal transmitting end, a PLC signal receiving end, and a power electronic apparatus. The PLC signal transmitting end is connected to the PLC signal receiving end through a power line, and the power electronic apparatus is connected to the power line. The power electronic apparatus is configured to increase output impedance in a first PLC communication frequency band, to reduce interference from an output current of the power electronic apparatus to a PLC signal in the first PLC communication frequency band. The first PLC communication frequency band is a PLC communication frequency band in which the PLC signal transmitting end sends the PLC signal to the PLC signal receiving end. In this way, the interference from the power electronic apparatus to the PLC signal in the first PLC communication frequency band can be reduced without adding an additional passive filter.
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34.发明公开公开(公告)号：US20230318464A1
公开(公告)日：2023-10-05
申请号：US18327286
申请日：2023-06-01
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu YU , Jinxiang ZHAN , Fuqiang XU , Jun WANG , Kai XIN
CPC classification number: H02M3/33569 , H02J3/381 , H02M3/015 , H02M7/487 , H02J2300/24
Abstract: A direct current converter includes a three-level power switching circuit, a resonant circuit, and a controller. An output voltage at an output end of the three-level power switching circuit is used to charge the resonant circuit. The controller is configured to control power switching components in the three-level power switching circuit, so that when the resonant circuit performs charging or discharging at one half of a direct current voltage, one of the power switching components is connected to a current loop of the resonant circuit, and when the resonant circuit performs charging or discharging at the direct current voltage, two of the power switching components are connected to the current loop of the resonant circuit. By using the direct current converter, a voltage borne by the power switching component in the direct current converter during current conversion can be reduced, thereby improving reliability of the direct current converter.
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公开(公告)号：US20230318440A1
公开(公告)日：2023-10-05
申请号：US18329896
申请日：2023-06-06
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu YU , Kai XIN , Zhiwu XU , Yanzhong ZHANG , Junjie LI
Abstract: A method and apparatus for suppressing cross current including: obtaining a common-mode current and a common-mode injection voltage of each inverter in an inverter parallel system; determining a virtual damping voltage of each inverter based on the common-mode current of each inverter and a preset common-mode damping factor, where if a direction in which a current flows out of the inverter is a positive direction, the preset common-mode damping factor is a negative value, or if a direction in which a current flows into the inverter is a positive direction, the preset common-mode damping factor is a positive value; superimposing the virtual damping voltage on the common-mode injection voltage of each inverter, to obtain a target common-mode voltage of each inverter; and controlling operation of each inverter based on the target common-mode voltage of each inverter and a differential mode voltage of each inverter.
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公开(公告)号：US20230216426A1
公开(公告)日：2023-07-06
申请号：US18180258
申请日：2023-03-08
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: A three-level inverter includes controllable switch components T1 to T6. Each of the controllable switch components includes a parallel connected junction capacitor and an anti-parallel connected diode. A first terminal of T1 is connected to a positive direct current bus, a second terminal of T4 is connected to a negative direct current bus, a second terminal of T1 is connected to first terminals of T2 and T5. A controller is configured to: in a positive half cycle, control T3 to be conducted after T1 is conducted, and control T3 to be disconnected before T1 is conducted next time; and in a negative half cycle, control T2 to be conducted after T4 is conducted, and control T2 to be disconnected before T4 is conducted next time. The three-level inverter can balance voltages of the controllable switch components.
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公开(公告)号：US20230116892A1
公开(公告)日：2023-04-13
申请号：US17964121
申请日：2022-10-12
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xinyu YU , Yuan YAO , Fuqiang XU , Kai XIN
Abstract: A power supply system, a converter, and a circulating current suppression method of the converter. The power supply system includes at least two converters that are coupled between a direct current power supply and an alternating current grid. Each converter obtains target output reactive power when an output current of the converter starts to increase from an initial current, obtains a reactive power compensation parameter based on the three-phase output voltages. Further, each converter obtains compensated output reactive power of the converter based on the reactive power compensation parameter and adjusts actual output reactive power of the converter based on the target output reactive power and the compensated output reactive power, so that an absolute value of a difference between common-mode output voltages of any two of the at least two adjusted converters is less than a difference threshold.
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