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公开(公告)号：US11614475B2
公开(公告)日：2023-03-28
申请号：US17762214
申请日：2021-03-10
摘要： A method and a photovoltaic inverter for determining the insulation resistance of a photovoltaic system relative to ground are provided. The voltage required for the measurement can be provided by an intermediate circuit in the form of an intermediate circuit voltage and a measuring device is designed to actuate an input short-circuit switch for short-circuiting a DC input with an AC disconnector open, as a result of which the intermediate circuit voltage can be applied to the DC input in the reverse direction. The measuring device is configured to record measured voltages with a switch of a voltage divider open and closed, and to determine the insulation resistance from the measured values of the two measured voltages recorded with the switch of the voltage divider open and closed.
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公开(公告)号：US11056876B2
公开(公告)日：2021-07-06
申请号：US16650178
申请日：2018-09-28
摘要： Circuit arrangement 1 for securely switching inverter devices 2 of a system by a common emergency switch 3 which is connected to a switching signal input 4 of one of the inverter devices 2 which is configured as a master of the system and comprises a switching signal output 5, other inverter devices 2 of the system configured as a slave being connected to the one inverter device via switching signal lines 6, wherein the inverter devices 2 configured as a slave together with the inverter device 2 configured as a master form a switching chain which is automatically switched upon actuation of the emergency switch 3.
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公开(公告)号：US11656256B2
公开(公告)日：2023-05-23
申请号：US17640913
申请日：2021-03-10
CPC分类号： G01R27/2605 , G01R15/04 , G01R31/12 , H02J3/381 , H02J7/35 , H02M3/04 , H02S40/32 , H02S40/38 , H02J2207/20 , H02J2300/24
摘要： A method and a photovoltaic inverter determines the system capacitance of a photovoltaic system relative to ground. The voltage required for the measurement can be provided by the intermediate circuit in the form of the intermediate circuit voltage, and the measuring device is designed to actuate an input short-circuit switch for short-circuiting the DC input with the AC disconnector open, as a result of which the intermediate circuit voltage can be applied to the DC input in the reverse direction, and the measuring device is configured to determine the system capacitance from the temporal waveform of the measured voltage after the switch of the voltage divider is closed.
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公开(公告)号：US11804710B2
公开(公告)日：2023-10-31
申请号：US17263396
申请日：2019-07-26
发明人： Bernd Hofer , Christian Fasthuber , Franz Fischereder , Stefan Breuer , Walter Spitzer , Mario Bairhuber , Reimar Pfeil
CPC分类号： H02J1/06 , H02H1/0015 , H02H1/0076 , H02J3/381 , H02J13/00002 , H02J2300/24
摘要： The aim of the invention is to detect an arc in an assembly for transmitting a direct voltage. This aim is achieved by a communication transformer having a primary winding and a secondary winding, the secondary winding being connected to a transmitting device, which is designed to impress a communication signal onto the secondary winding of the communication transformer, and the primary winding being connected to one of the direct voltage lines in order to feed a communication signal transformed by the communication transformer to one of the direct voltage lines. In order to detect, in the assembly, the arc signal caused by an arc, the secondary winding is connected to an arc detection unit, which is designed to detect an arc signal transformed by the communication transformer.
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公开(公告)号：US20200227909A1
公开(公告)日：2020-07-16
申请号：US16650178
申请日：2018-09-28
摘要： Circuit arrangement 1 for securely switching inverter devices 2 of a system by a common emergency switch 3 which is connected to a switching signal input 4 of one of the inverter devices 2 which is configured as a master of the system and comprises a switching signal output 5, other inverter devices 2 of the system configured as a slave being connected to the one inverter device via switching signal lines 6, wherein the inverter devices 2 configured as a slave together with the inverter device 2 configured as a master form a switching chain which is automatically switched upon actuation of the emergency switch 3.
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