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公开(公告)号：US11451163B2
公开(公告)日：2022-09-20
申请号：US16753475
申请日：2018-09-13
Inventor： Kazunori Kidera , Kenji Hanamura
Abstract: A power converter 10 includes: flying capacitor circuits 11 and 12 connected in series so as to be in parallel with a DC power supply; flying capacitor circuits 13 and 14 connected in series so as to be in parallel with the DC power supply; switching elements S1 and S2 connected in series between output terminals of the flying capacitor circuits 11 and 12; switching elements S3 and S4 connected in series between output terminals of the flying capacitor circuits 13 and 14; a first output end OUT1 provided at a midpoint between the switching elements S1 and S2; and a second output end OUT2 provided at a midpoint between the switching elements S3 and S4, wherein a node between the flying capacitor circuits 11 and 12 and a node between the flying capacitor circuits 13 and 14 are connected to a midpoint of a DC power supply voltage.
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公开(公告)号：US09831778B2
公开(公告)日：2017-11-28
申请号：US15309929
申请日：2015-04-23
Inventor： Kazunori Kidera , Mariko Kifuji
IPC: H02M3/158 , H02M7/5387 , H02M7/487
CPC classification number: H02M3/158 , H02M7/483 , H02M7/487 , H02M7/5387 , H02M2001/007
Abstract: A first conversion circuit switches a magnitude of a voltage generated between a first output point and a reference potential point in three stages. The second conversion circuit switches a magnitude of a voltage generated between the reference potential point and a second output point in three stages. The third conversion circuit includes first to fourth switches in a full bridge configuration and converts a voltage generated between the first output point and the second output point into an alternate current voltage and outputs the alternate current voltage. The third conversion circuit forms a current path including inductors between the first output point and the second output point during a start time period from a start of supplying power from a direct current power supply until a first capacitor and a second capacitor are charged to a specified voltage.
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公开(公告)号：US09806618B2
公开(公告)日：2017-10-31
申请号：US15309914
申请日：2015-04-17
Inventor： Kazunori Kidera , Mariko Kifuji
IPC: H02M7/49 , H02M7/5387 , H02M3/158
CPC classification number: H02M3/158 , H02M3/156 , H02M7/483 , H02M7/5387 , H02M2001/007 , H02M2001/0074
Abstract: A first conversion circuit is electrically connected between a reference potential point and a first input point on a high potential side of a direct current power supply. A second conversion circuit is electrically connected between the reference potential point and a second input point on a low potential side of the direct current power supply. A voltage-regulating circuit is configured to adjust a magnitude of an applied voltage to the first conversion circuit and the second conversion circuit. The voltage-regulating circuit is configured to increase the magnitude of the applied voltage over time during a start time period from a start of supplying power from the direct current power supply until a first capacitor and a second capacitor are charged to a specified voltage.
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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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Patent Agency Ranking
公开(公告)号：US09654015B2
公开(公告)日：2017-05-16
申请号：US14899808
申请日：2014-07-01
Inventor： Kazunori Kidera , Jin Yoshizawa
CPC classification number: H02M3/33546 , H02M3/33584 , H02M7/487 , H02M7/797
Abstract: In a discharging operation of a vehicle storage battery, a controller switches between a full-wave rectification operation of full-wave rectify a voltage across a second winding while maintaining a second short circuit in an open state, and a full-wave voltage doubling rectification operation of full-wave voltage doubling rectify a voltage across second winding while maintaining second short circuit in a closed state, based on magnitude relationship between DC voltage across first terminals and DC voltage across second terminals. In a charging operation, controller switches between a full-wave rectification operation of full-wave rectify a voltage across a first winding while maintaining a first short circuit in an open state, and a full-wave voltage doubling rectification operation of full-wave voltage doubling rectify a voltage across first winding while maintaining first short circuit in a closed state, based on magnitude relationship between DC voltage across first terminals and DC voltage across second terminals.
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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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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：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：US09893648B2
公开(公告)日：2018-02-13
申请号：US15504808
申请日：2015-10-28
Inventor： Mariko Kifuji , Kazunori Kidera , Mitsuru Tanabe , Kazuo Itoh
IPC: H02M7/539
Abstract: A controller switches between modes each having a different connection state of a DC power supply and the capacitor with respect to first and second output points by controlling switches. A generation unit generates a reference wave including at least one carrier wave. The modes are classified into a sustaining mode in which no current is caused to flow to the capacitor, a charging mode in which a current is caused to flow to the capacitor, and a discharging mode in which a current in a direction opposite to that in the charging mode is caused to flow to the capacitor. The controller switches between the sustaining mode and a charging or discharging mode according to the comparison result between a signal wave and the reference wave.
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