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公开(公告)号：US12235306B2
公开(公告)日：2025-02-25
申请号：US18015056
申请日：2021-07-20
Inventor： Kazunori Kidera , Tatsuo Koga , Takahiro Ohori , Keita Kanamori , Kazuya Ohshima
IPC: G01R31/00
Abstract: An arc detection device includes an obtainer and a determiner. The obtainer obtains a measurement result for a voltage applied to one target power supply line among a plurality of power supply lines to which power is supplied from a DC power source. The determiner determines, based on a component of a specific frequency band in the measurement result for the voltage obtained by the obtainer, whether there is a possibility of an arc fault occurring in the plurality of power supply lines.
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公开(公告)号：US11329471B2
公开(公告)日：2022-05-10
申请号：US16757846
申请日：2018-09-21
Inventor： Tatsuo Koga , Atsushi Okita , Mitsuru Kaji
Abstract: An arc detection circuit includes a current detector and arc determination unit. The current detector detects a current flowing through a transmission line which connects an electric power supply device and an electric power conversion circuit. The arc determination unit calculates, from a result of measurement of the current, an area of interest and an area for comparison. The area of interest is an area of a region of interest defined by a predetermined frequency range and predetermined time for determination. The area for comparison is an area of a portion in which detected strength exceeds a predetermined strength threshold in the region of interest. The arc determination unit determines an electric arc has occurred when a ratio between the area of interest and the area for comparison exceeds a predetermined area-ratio threshold.
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公开(公告)号：US12100563B2
公开(公告)日：2024-09-24
申请号：US18015134
申请日：2021-09-08
Inventor： Kazunori Kidera , Tatsuo Koga , Takahiro Ohori
CPC classification number: H01H1/0015 , H02H3/093
Abstract: An arc detection system includes an obtainer and a determiner. The obtainer obtains a measurement result for current flowing in a power supply line to which power is supplied from a DC power source. The determiner determines, based on a component of a specific frequency band in the measurement result for the current obtained by the obtainer, whether an arc fault has occurred. The determiner determines that the arc fault has occurred when a specific time for which the component of the specific frequency band is at least a threshold is longer than an occurrence time in which an arc can occur when a device is attached to or detached from the power supply line.
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公开(公告)号：US11418018B2
公开(公告)日：2022-08-16
申请号：US16483415
申请日：2018-01-31
Inventor： Tatsuo Koga
Abstract: An arc detection circuit includes: a current detector that detects a current supplied from a power supply apparatus via a transmission path; a voltage detector that detects a voltage applied to the transmission path; and an arc determination unit configured to determine whether an arc has occurred in the transmission path based on the voltage, when one or more particular frequency components of the current exceed a first threshold.
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公开(公告)号：US12149062B2
公开(公告)日：2024-11-19
申请号：US17907847
申请日：2021-03-03
Inventor： Kazunori Kidera , Tatsuo Koga , Keita Kanamori
Abstract: An arc detection device is used in a system including one or more power sources, a plurality of converters, and a plurality of load devices. The one or more power sources and the plurality of converters are connected to each other by a plurality of power lines. The plurality of converters and the plurality of load devices are connected to each other by a plurality of power lines. The arc detection device includes: an electric current detector that includes a magnetic core through which two or more power lines included in the plurality of power lines extend, and detects combined currents flowing through the two or more power lines according to the magnetic field produced at the magnetic core; and an arc determiner that determines, on the basis of the combined currents detected by the electric current detector, whether an electric arc has occurred.
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Patent Agency Ranking
公开(公告)号：US12113347B2
公开(公告)日：2024-10-08
申请号：US17907847
申请日：2021-03-03
Inventor： Kazunori Kidera , Tatsuo Koga , Keita Kanamori
CPC classification number: H02H1/0015 , G01R15/202 , G01R31/40
Abstract: An arc detection device is used in a system including one or more power sources, a plurality of converters, and a plurality of load devices. The one or more power sources and the plurality of converters are connected to each other by a plurality of power lines. The plurality of converters and the plurality of load devices are connected to each other by a plurality of power lines. The arc detection device includes: an electric current detector that includes a magnetic core through which two or more power lines included in the plurality of power lines extend, and detects combined currents flowing through the two or more power lines according to the magnetic field produced at the magnetic core; and an arc determiner that determines, on the basis of the combined currents detected by the electric current detector, whether an electric arc has occurred.
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公开(公告)号：US11088528B2
公开(公告)日：2021-08-10
申请号：US16483414
申请日：2018-01-31
Inventor： Tatsuo Koga
Abstract: An arc detection circuit that detects an arc that occurs in a transmission path that transmits power from a power supply apparatus to a power conditioner, the arc detection circuit includes: a current detector that detects a current flowing through the transmission path; a storage unit configured to store a base characteristic which is a frequency characteristic of the current flowing through the transmission path when the arc is not present; and an arc determination unit configured to determine whether the arc has occurred based on a result of a comparison between the base characteristic and a detection characteristic which is a frequency characteristic of the current detected by the current detector.
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公开(公告)号：US12184055B2
公开(公告)日：2024-12-31
申请号：US17908987
申请日：2021-03-03
Inventor： Tatsuo Koga , Yoshio Mitsutake , Keita Kanamori
Abstract: An arc detection device includes a voltage detector connected between a first wire and a second wire to detect a voltage between the first wire and the second wire, the first wire connecting a positive electrode of a DC/DC converter and a plurality of DC/DC converters and branching from the positive electrode of the DC power source into the plurality of DC/DC converters, the second wire connecting a negative electrode of the DC/DC converter and the plurality of DC/DC converters and branching from the negative electrode of the DC/DC converter into the plurality of DC/DC converters; and an arc determiner that determines an occurrence of an arc based on the voltage detected by the voltage detector.
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公开(公告)号：US12088080B2
公开(公告)日：2024-09-10
申请号：US17802632
申请日：2021-03-03
Inventor： Kazuya Ohshima , Tatsuo Koga , Keita Kanamori , Kazunori Kidera
CPC classification number: H02H1/0015 , H02H7/20
Abstract: An arc detection device includes: a current detector that includes a magnetic core penetrated by first and second paths each connecting a DC power source and a device, and detects a current flowing through each of the first and second paths in accordance with a magnetic field generated at the magnetic core; a low impedance circuit having a lower impedance than the DC power source and the device, the low impedance circuit being connected to the first path and the second path to cause a high frequency component to bypass one of the first path or the second path; and an arc determiner that determines an occurrence of an arc based on a current detected by the current detector. In the magnetic core, a direct current flows through the first path in a direction opposite to a direction in which a direct current flows through the second path.
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公开(公告)号：US11923670B2
公开(公告)日：2024-03-05
申请号：US17908317
申请日：2021-03-03
Inventor： Tatsuo Koga , Kazunori Kidera , Keita Kanamori
CPC classification number: H02H1/0015 , G01R31/40 , H02H7/268 , H02S50/00
Abstract: An arc detection device includes: a low-impedance circuit connected between a node on wiring connecting the positive electrode of a DC/DC converter and a plurality of DC/DC converters, extending from the positive electrode of the DC/DC converter, and branching toward the plurality of DC/DC converters and a node on wiring connecting the negative electrode of the DC/DC converter and the plurality of DC/DC converters, extending from the negative electrode of the DC/DC converter, and branching toward the plurality of DC/DC converters; an electric current detector that detects an electric current flowing through the low-impedance circuit; and an arc determiner that determines, on the basis of the electric current detected by the electric current detector whether an electric arc has occurred.
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