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公开(公告)号：US20220231499A1
公开(公告)日：2022-07-21
申请号：US17584102
申请日：2022-01-25
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: A photovoltaic power generation system includes a capacitor bridge arm, an inverter bridge arm, and the fault protection apparatus. The capacitor bridge arm includes a positive electrode output port, a negative electrode output port, and a reference output port The inverter bridge arm includes a positive electrode input port, a negative electrode input port, and a reference input port. The positive electrode input port is connected to the positive electrode output port. The negative electrode input port is connected to the negative electrode output port. The reference input port is connected to the reference output port by using the fault protection apparatus. The fault protection apparatus is turned off based on a magnitude value or a variation of a voltage, or a magnitude value or a variation of a current between the reference input port and the positive electrode input port or the negative electrode input port.
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公开(公告)号：US20220199585A1
公开(公告)日：2022-06-23
申请号：US17693014
申请日：2022-03-11
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Dong CHEN , Lei SHI , Zhaohui WANG
Abstract: This application provides a diode discrete device, a circuit with a bypass function, and a converter. The diode discrete device is used in a circuit with a bypass function, and the diode discrete device includes a discrete device package, a first diode, and a second diode. The first diode is a main circuit diode, the second diode is a bypass diode, first performance of the first diode is better than first performance of the second diode, and the first performance includes a reverse recovery charge and reverse recovery time. The first diode and the second diode are packaged into the discrete device package, and an anode of the first diode is connected to an anode of the second diode, or a cathode of the first diode is connected to a cathode of the second diode. The diode discrete device can improve integration and power density of the circuit.
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公开(公告)号：US20240396472A1
公开(公告)日：2024-11-28
申请号：US18797720
申请日：2024-08-08
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Shen GAO , Fenglong LU , Shuai LIU , Lei SHI
IPC: H02M7/5387 , H02M7/487
Abstract: An inverter includes an inverter circuit, a collection circuit, a balanced circuit, and an inductor. The collection circuit is configured to detect a direct current bus voltage, to obtain end voltage values of a first capacitor and a second capacitor. The balanced circuit is configured to: when an end voltage value of a target capacitor is less than or equal to a first voltage threshold, control on or off of a plurality of switching transistors, to adjust a current for charging the target capacitor through the inductor and reduce a difference between the end voltage values of the target capacitor and a non-target capacitor in the two groups of capacitors. When the difference between the end voltage values of the two groups of capacitors in the inverter circuit is large, the balanced circuit may adjust an output current of the inductor to charge the target capacitor.
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公开(公告)号：US20240333135A1
公开(公告)日：2024-10-03
申请号：US18617721
申请日：2024-03-27
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Fenglong LU , Shuai LIU , Dong CHEN , Lei SHI
Abstract: An inverter apparatus and a control method thereof. The inverter apparatus includes a direct current bus, a bus capacitor, an inverter bridge arm, a filter circuit, a switch unit, and a controller. The inverter bridge arm is connected to a positive direct current bus and a negative direct current bus, and the filter circuit is connected between the inverter bridge arm and a user load. In a working scenario in which the inverter apparatus switches between on-grid operation and off-grid operation, when the working scenario is on-grid operation and off-grid operation with a balanced load, an inverter uses a common-mode injection modulation mode; and when the working scenario is off-grid operation with an unbalanced, the inverter uses a common SPWM modulation mode. The embodiments are implemented to improve working efficiency of the inverter in more working scenarios, and the implementation is simple, stable, reliable, and load-friendly.
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Patent Agency Ranking
公开(公告)号：US20240088828A1
公开(公告)日：2024-03-14
申请号：US18517118
申请日：2023-11-22
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Dong CHEN , Yanzhong ZHANG , Yongbing GAO , Lei SHI
CPC classification number: H02S40/32 , H02M1/0006 , H02M1/0009 , H02M1/088 , H02S40/34 , H02S40/38
Abstract: A photovoltaic power generation system and a conversion circuit. Two groups of photovoltaic arrays are cascaded by using the conversion circuit disposed in the photovoltaic power generation system to effectively increase an input voltage of a DC/AC conversion circuit. In this way, a cable with an existing diameter specification can improve current transmission in the photovoltaic power generation system, to effectively reduce costs of the photovoltaic power generation system. A voltage to earth at an intermediate node in the conversion circuit is adjusted to a first preset value, so that both an absolute value of a voltage to earth of a first group of photovoltaic arrays and an absolute value of a voltage to earth of a second group of photovoltaic arrays are less than a first threshold.
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26.发明公开公开(公告)号：US20240014664A1
公开(公告)日：2024-01-11
申请号：US18474453
申请日：2023-09-26
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Dong CHEN , Yongbing GAO , Lei SHI
CPC classification number: H02J3/381 , H02J3/46 , H02J2300/24
Abstract: A power supply system includes direct current combiner boxes and an inverter, where output terminals of all direct current combiner boxes are connected in series and/or in parallel and then coupled to an input terminal of the inverter, and the direct current combiner box includes a controller, a detection circuit, and a direct current conversion circuit. The direct current conversion circuit performs direct current conversion on an input terminal voltage of the direct current combiner box to obtain an output terminal voltage of the direct current combiner box. The detection circuit detects an output terminal parameter of the direct current combiner box, and sends the output terminal parameter of the direct current combiner box to the controller. The controller controls an output voltage of the direct current conversion circuit based on the output terminal parameter of the direct current combiner box.
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公开(公告)号：US20230086269A1
公开(公告)日：2023-03-23
申请号：US18071847
申请日：2022-11-30
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Dong CHEN , Yongbing GAO , Lei SHI , Xun WANG
Abstract: A fault protection apparatus includes a first diode, a first switch component, a control unit, a first port, a second port, a third port, a fourth port, and a fifth port. The first port is connected to a positive common direct current bus of the common direct current bus. The second port is connected to a negative common direct current bus of the common direct current bus. The third port is connected to a positive local bus of a branch on which the fault protection apparatus is located. The fourth port is connected to a negative local bus of the branch on which the fault protection apparatus is located. The first diode and the first switch component are connected to the power system through the first port, the second port, the third port, and the fourth port.
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28.发明申请公开(公告)号：US20220271712A1
公开(公告)日：2022-08-25
申请号：US17673140
申请日：2022-02-16
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Yongbing GAO , Yunyu TANG , Lei SHI
Abstract: A fault detection apparatus includes a temperature detection unit, a current detection unit, a controller, and a breaking unit. The temperature detection unit is configured to detect temperatures of the plurality of filter capacitors and output the temperatures to the controller. The current detection unit is coupled to the plurality of filter capacitors and is configured to detect currents of the plurality of filter capacitors and output the currents to the controller. The controller is separately connected to the temperature detection unit, the current detection unit, and the breaking unit, and is configured to: when the received temperature exceeds a first threshold and the received current exceeds a second threshold, control the breaking unit to be disconnected. The breaking unit is connected between the output end of the grid-tied inverter and the plurality of filter capacitors and is configured to be disconnected or connected under control of the controller.
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公开(公告)号：US20220103167A1
公开(公告)日：2022-03-31
申请号：US17549489
申请日：2021-12-13
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Xudong WANG , Zhaohui WANG , Lei SHI
IPC: H03K17/16
Abstract: This application provides a control method for a switching apparatus. The switching apparatus includes at least two switching devices connected in parallel, a minimum pulse width limit of the first switching device is less than a minimum pulse width limit of the second switching device, and the first switching device and the second switching device are in a turn-off state. The method includes: obtaining on-state holding time of the switching apparatus; controlling the at least two switching devices to remain in a cut-off state when the on-state holding time is less than the minimum pulse width limit of the first switching device; and controlling the first switching device to perform a switching operation when the on-state holding time is greater than or equal to the minimum pulse width limit of the first switching device. The application can reduce a loss of the switching device and reduce output distortion.
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