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公开(公告)号：EP4333299A1
公开(公告)日：2024-03-06
申请号：EP23194158.4
申请日：2023-08-30
发明人： ZHAN, Jinxiang , YU, Ting
摘要： This application provides a drive acceleration circuit, including: a drive power supply, including an output end and a reference signal end, where the output end is configured to output a drive signal, and the reference signal end is electrically connected to a connection end of a switching device and is configured to output a reference signal to the connection end; a first drive tributary, where the first drive tributary is electrically connected to the output end of the drive power supply and a control end of the switching device, and is configured to drive, based on the drive signal, the switching device to turn on or turn off; and a second drive tributary, which is connected in parallel with the first drive tributary, where the second drive tributary includes a drive acceleration unit and a selective conduction unit, one end of the drive acceleration unit is electrically connected to the output end of the drive power supply, another end of the drive acceleration unit is electrically connected to the control end of the switching device through the selective conduction unit, the selective conduction unit is turned on in a time division manner to make the second drive tributary closed or open, and the drive acceleration unit is configured to accelerate on/off of the switching device based on the drive signal when the second drive tributary is closed. This application further provides a circuit system.
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公开(公告)号：EP4425776A1
公开(公告)日：2024-09-04
申请号：EP24160879.3
申请日：2024-03-01
发明人： ZHAN, Jinxiang , GAO, Kai , WANG, Juncan , GAO, Yongbing
摘要： This application provides a power conversion device. The 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, and an inverter circuit. An input terminal of the inverter circuit is connected to an input terminal of the power conversion device separately by using the positive direct current bus and the negative direct current bus, and an output terminal of the inverter circuit is connected to an output terminal of the power conversion device. 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. According to this application, 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 current can be avoided.
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公开(公告)号：EP4287503A1
公开(公告)日：2023-12-06
申请号：EP21926122.9
申请日：2021-02-20
发明人： ZHANG, Fangpo , LIN, Tiansan , ZHANG, Xiufeng , ZHAN, Jinxiang
摘要： This application discloses a photovoltaic system, a direct-current combiner box, and a fault isolation method. The photovoltaic system includes a fault isolation circuit and a DC/DC conversion circuit. A first end of the fault isolation circuit is connected to N photovoltaic strings, and a second end of the fault isolation circuit is connected to an input end of the DC/DC conversion circuit. The fault isolation circuit includes a multipole switch, and each group of photovoltaic strings in the N photovoltaic strings is connected to an input end of a power conversion circuit through one pole of switch in the multipole switch. Each group of photovoltaic strings includes at least two photovoltaic strings. When a reverse connection fault occurs in the N photovoltaic strings, the entire multipole switch is turned off in linkage. This reduces complexity of a hardware structure, and reduces costs of the fault isolation circuit.
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4.发明公开
公开(公告)号：EP4277106A1
公开(公告)日：2023-11-15
申请号：EP21918337.3
申请日：2021-01-14
发明人： YU, Xinyu , ZHAN, Jinxiang , XU, Fuqiang , WANG, Jun , XIN, Kai
摘要： This application discloses a direct current converter, a control method, a direct current combiner box, and a photovoltaic power generation system, and relates to the field of photovoltaic power generation technologies. The direct current converter includes a three-level power switching circuit, a resonant circuit, and a controller. An input end of the three-level power switching circuit is connected to a direct current power supply, and 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：EP4262041A1
公开(公告)日：2023-10-18
申请号：EP20967711.1
申请日：2020-12-31
发明人： ZHANG, Yanzhong , FANG, Hongmiao , YU, Bo , ZHAN, Jinxiang , LIN, Tiansan
摘要： This application discloses a photovoltaic system, a power supply system, and a control method. A first input end of a first inverter is connected to a second end of a direct current positive bus, and a second input end of the first inverter is connected to a second end of a neutral bus. A first input end of a second inverter is connected to the second end of the neutral bus, and a second input end of the second inverter is connected to a second end of a direct current negative bus. A controller is configured to control, in startup and shutdown processes, a voltage to ground of the direct current positive bus, a voltage to ground of the direct current negative bus, and a voltage to ground of the neutral bus each to be less than or equal to a preset voltage threshold, to ensure personal safety and device safety. In startup, shutdown, and operating processes of the photovoltaic system, the controller controls startup and shutdown sequences of each device in the photovoltaic system to ensure that voltages to ground of the three direct current buses do not exceed a requirement of a production compliance voltage, so as to ensure personal safety and device safety. If an overvoltage occurs in the operating process of the photovoltaic system, the photovoltaic system needs to be protected in a timely manner to avoid expansion of a fault range.
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