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1.发明授权公开(公告)号：US11239746B2
公开(公告)日：2022-02-01
申请号：US16783310
申请日：2020-02-06
发明人： Tao Zhao , Fushuai Zhuang , Xinyu Wang , Jiacai Zhuang , Mingda Wang , Yuan Zhuang
摘要： A two-stage converter, a method for starting the two-stage converter, an LLC converter, and an application system are provided. A controller of the LLC converter of the two-stage converter first controls a main circuit of the LLC converter to perform hiccup charging on a direct current bus of a later-stage converter at a preset interval, so that the direct current bus voltage of the later-stage converter gradually increases, until an auxiliary power supply of the later-stage converter starts to operate, to supply power to the controller of the later-stage converter. After the controller of the later-stage converter reports the detected direct current bus voltage, the controller of the LLC converter determines whether the output voltage of the LLC converter increases to a hiccup starting voltage. If so, the controller of the LLC converter controls the main circuit to operate in a hiccup voltage stabilization phase.
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公开(公告)号：US11626837B2
公开(公告)日：2023-04-11
申请号：US17404007
申请日：2021-08-17
发明人： Yanfei Yu , Xiaoxun Li , Anying Jiang , Xinyu Wang
摘要： A photovoltaic system and a method for locating devices in a photovoltaic string. A communication host in the photovoltaic system acquires accumulated operation durations of MLPE apparatuses of the photovoltaic string, ranks the accumulated operation durations to obtain a ranking result, and determines a physical location of each device in the photovoltaic string according to the ranking result and a sequence of installing positions of the devices, where the devices are installed at the installing positions based on the sequence. It is not necessary to paste label codes on the MLPE apparatuses, or record serial numbers of the MLPE apparatuses by installation personnel. Operation processes are simplified, operation time is saved, and labor costs are reduced.
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公开(公告)号：US11088655B2
公开(公告)日：2021-08-10
申请号：US16239256
申请日：2019-01-03
发明人： Jiacai Zhuang , Yilei Gu , Jun Xu , Xinyu Wang
IPC分类号： H02S40/32 , H02J3/38 , H02J3/01 , H02M7/797 , H02M7/48 , H02M3/335 , H02M7/49 , H02M1/00 , H02M3/24
摘要： A photovoltaic solid-state transformer, a photovoltaic inverter system and a bidirectional high-voltage transformer are provided. The photovoltaic solid-state transformer includes: multiple single phase modules and a filter. Each of the single phase modules includes multiple multiple-output isolated DC/DC converters and multiple cascade DC/AC modules, where each of the multiple-output isolated DC/DC converters includes a DC/AC module, a high frequency transformer and multiple AC/DC modules. The multiple single phase modules are connected to the grid via the filter in a star connection or a delta connection. The DC/DC converters and the cascade DC/AC modules are simple logical switches and have conversion efficiency higher than 99%, such that the photovoltaic solid-state transformer has a reduced volume, and an improved overall efficiency higher than 98.5%.
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公开(公告)号：US11894687B2
公开(公告)日：2024-02-06
申请号：US17404181
申请日：2021-08-17
发明人： Yanfei Yu , Anying Jiang , Xinyu Wang , Xiaoxun Li
CPC分类号： H02J3/40 , H02J3/381 , H02S40/30 , H02S50/10 , H02J2300/24
摘要： A photovoltaic system, a method for locating devices in a photovoltaic string, a MLPE apparatus, and a method for ranking MLPE apparatuses. Each MLPE apparatus sends, actively according to a predetermine rule, an initial message to the other MLPE apparatuses. The initial message includes a serial number corresponding to said MLPE apparatus and an accumulated operation duration of said MLPE apparatus. The MLPE apparatuses determine the rank of the accumulated operation duration of each MLPE apparatus according to the initial messages sent from all MLPE apparatuses. After each MLPE apparatus communicates with a communication host, the MLPE apparatuses reports the rank of the accumulated operation duration of each MLPE apparatus to the communication host. Thereby, the communication host may determine a physical location of each device in the photovoltaic string according to the ranks of the accumulated operation durations and a sequence of installing positions of the devices in the photovoltaic string.
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公开(公告)号：US10574059B2
公开(公告)日：2020-02-25
申请号：US15912005
申请日：2018-03-05
发明人： Xinyu Wang , Jun Xu , Yilei Gu , Yu Gu
摘要： A control apparatus and a combiner box are provided. In a case that component maintenance needs to be performed, an optimizer connected to the combiner box is controlled to operate in a safe mode, and a switch-off signal is outputted to disconnect the combiner box from an inverter if an output current of the combiner box is smaller than a threshold. In a case that the maintenance is completed, the optimizer connected to the combiner box is controlled to operate in a maximum power point tracking mode, and the combiner box is connected to the inverter if an input voltage of the combiner box is greater than an output voltage of the combiner box, that is, if an output voltage of a corresponding string increases gradually to a value exceeding a direct current bus voltage.
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公开(公告)号：US11863067B2
公开(公告)日：2024-01-02
申请号：US17528273
申请日：2021-11-17
发明人： Guoqing Cai , Jiacai Zhuang , Xinyu Wang , Jun Xu
摘要： Provided is a bridge cascade system, which includes at least one phase unit and a driving unit for the phase unit. The phase unit includes N bridge topologies cascaded on alternating current AC sides. The driving unit includes one driving power supply circuit, multiple bootstrap power supply circuits and 2N driving circuits. In the phase unit, the driving circuits are powered by the driving power supply circuit directly or through corresponding bootstrap power supply circuits. The driving circuits are configured to provide driving signals for corresponding switch transistors in the phase unit. In this way, one driving power supply is matched with multiple bootstrap power supply circuits, realizing power supply to the driving circuits corresponding to the switch transistors of all bridge topologies, which reduces the difficulty in designing the driving power supply for the bridge cascade system and reduces cost for the system.
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公开(公告)号：US11683008B2
公开(公告)日：2023-06-20
申请号：US17380418
申请日：2021-07-20
发明人： Xinyu Wang , Anying Jiang , Shun Ding , Yanfei Yu , Xiaoxun Li
摘要： A photovoltaic inverter, a photovoltaic system, and a method for controlling discharging are provided. The photovoltaic inverter includes a first DCDC converter, an inverter circuit, a first discharging circuit, and a controller. A port capacitor is connected between a positive input end and a negative input end of the first DCDC converter. The port capacitor includes an X capacitor and a first group of Y capacitors. The first discharging circuit is connected between a common terminal of the first group of Y capacitors and a direct current bus, where the common terminal of the first group of Y capacitors is grounded. The controller is configured to control, when receiving a rapid shutdown instruction, the first discharging circuit to operate. The first discharging circuit is configured to discharge electrical energy of the port capacitor.
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公开(公告)号：US20230126969A1
公开(公告)日：2023-04-27
申请号：US17915396
申请日：2021-03-08
发明人： Yu Yang , Yanfei Yu , Xinyu Wang , Jun XU
摘要： A photovoltaic assembly turnoff device, and a photovoltaic system. The rapid turnoff method includes: after receiving a start signal, a photovoltaic assembly turnoff device controls itself to be turned on, so that a photovoltaic assembly connected thereto achieves electric energy output; then, the photovoltaic assembly turnoff device can measure a state parameter thereof to determine whether a corresponding inverter channel in a photovoltaic system has a fault; if the corresponding inverter channel in the photovoltaic system has the fault, control the photovoltaic assembly turnoff device to be turned off, so that the photovoltaic assembly connected thereto stops the electric energy output; if the corresponding inverter channel in the photovoltaic system has no fault, always keep the photovoltaic assembly turnoff device to be turned on.
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公开(公告)号：US20220209659A1
公开(公告)日：2022-06-30
申请号：US17528273
申请日：2021-11-17
发明人： Guoqing Cai , Jiacai Zhuang , Xinyu Wang , Jun Xu
摘要： Provided is a bridge cascade system, which includes at least one phase unit and a driving unit for the phase unit. The phase unit includes N bridge topologies cascaded on alternating current AC sides. The driving unit includes one driving power supply circuit, multiple bootstrap power supply circuits and 2N driving circuits. In the phase unit, the driving circuits are powered by the driving power supply circuit directly or through corresponding bootstrap power supply circuits. The driving circuits are configured to provide driving signals for corresponding switch transistors in the phase unit. In this way, one driving power supply is matched with multiple bootstrap power supply circuits, realizing power supply to the driving circuits corresponding to the switch transistors of all bridge topologies, which reduces the difficulty in designing the driving power supply for the bridge cascade system and reduces cost for the system.
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公开(公告)号：US20220069769A1
公开(公告)日：2022-03-03
申请号：US17404007
申请日：2021-08-17
发明人： Yanfei Yu , Xiaoxun Li , Anying Jiang , Xinyu Wang
摘要： A photovoltaic system and a method for locating devices in a photovoltaic string. A communication host in the photovoltaic system acquires accumulated operation durations of MLPE apparatuses of the photovoltaic string, ranks the accumulated operation durations to obtain a ranking result, and determines a physical location of each device in the photovoltaic string according to the ranking result and a sequence of installing positions of the devices, where the devices are installed at the installing positions based on the sequence. It is not necessary to paste label codes on the MLPE apparatuses, or record serial numbers of the MLPE apparatuses by installation personnel. Operation processes are simplified, operation time is saved, and labor costs are reduced.
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