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公开(公告)号：US20250130304A1
公开(公告)日：2025-04-24
申请号：US18681471
申请日：2022-08-24
Inventor： Tatsuo KOGA , Jin YOSHIZAWA , Kazuto URA
Abstract: A position estimation system includes: an obtainer that obtains image information of an image showing an indoor space in which a person is located; an estimator that estimates the coordinates of the person in the indoor space, on the basis of the image information obtained; and a position information obtainer that obtains position information of a first communication device from a positioning system. The estimator estimates the coordinates of a target first communication device held by the person, based on the coordinates of the person estimated and the position information obtained, and estimates the coordinates of an object other than the person in the indoor space, on the basis of a state of communication between a third communication device held by the object and the target first communication device, and the coordinates of the target first communication device estimated.
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公开(公告)号：US20230011371A1
公开(公告)日：2023-01-12
申请号：US17802632
申请日：2021-03-03
Inventor： Kazuya OHSHIMA , Tatsuo KOGA , Keita KANAMORI , Kazunori KIDERA
Abstract: An arc detection device includes: a current detector that includes a magnetic core penetrated by first and second paths and each connecting a DC power source and a device, and detects a current flowing through each of the first and second paths and 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：US20210194235A1
公开(公告)日：2021-06-24
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：US20230393218A1
公开(公告)日：2023-12-07
申请号：US18249334
申请日：2021-10-05
Inventor： Tatsuya TAKAHASHI , Tatsuo KOGA
CPC classification number: G01R31/58 , G01R31/086 , H04B3/46
Abstract: An arc detection system includes a first obtainment unit, a second obtainment unit, and a determination unit. The first obtainment unit obtains a measurement result of current flowing in a power line to which power is supplied from a power supply or a measurement result of voltage in the power line. The second obtainment unit obtains quality information about the quality of communication with a device connected to the power line through power line communication with the device via the power line. The determination unit determines whether or not an arc fault has occurred in the power line based on components in a specific frequency band of the measurement result obtained by the first obtainment unit and the quality information obtained by the second obtainment unit.
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公开(公告)号：US20230280387A1
公开(公告)日：2023-09-07
申请号：US18017691
申请日：2021-07-20
Inventor： Tatsuo KOGA , Kazunori KIDERA , Kazuya OHSHIMA , Takahiro OHORI , Keita KANAMORI
CPC classification number: G01R31/086 , G06F30/27
Abstract: An anomaly detection device that detects an anomaly in an object, the anomaly detection device includes: an analyzer that performs frequency analysis of sensing data obtained from a sensor that senses a physical quantity of the object; and a determiner that determines whether an anomaly is occurring in the object based on an output result output from a trained model by inputting frequency analysis data of the sensing data obtained from the sensor to the trained model that has been trained based on at least one of frequency analysis data of sensing data of the physical quantity obtained when the object is in a normal state or frequency analysis data of sensing data of the physical quantity obtained when the object is in an anomalous state.
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Patent Agency Ranking
公开(公告)号：US20230268740A1
公开(公告)日：2023-08-24
申请号：US18017140
申请日：2021-07-20
Inventor： Takahiro OHORI , Kazunori KIDERA , Tatsuo KOGA , Kazuya OHSHIMA , Keita KANAMORI
IPC: H02J3/38
CPC classification number: H02J3/38
Abstract: A power distribution system includes: a power distribution network that includes one or more connections to which a load is connectable; and a plurality of power supplies capable of supplying power to the power distribution network. Power is supplied to the power distribution network from at least one power supply of the plurality of power supplies. Adjacent power supplies included in the plurality of power supplies are arranged with a gap therebetween, and a connection included in the one or more connections is positioned in the gap.
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公开(公告)号：US20230253167A1
公开(公告)日：2023-08-10
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：US20230126245A1
公开(公告)日：2023-04-27
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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公开(公告)号：US20230099131A1
公开(公告)日：2023-03-30
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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10.发明申请公开(公告)号：US20200014189A1
公开(公告)日：2020-01-09
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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