Patents by Inventor Goro Nakao

Goro Nakao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11955812
    Abstract: A power receiver device of a non-contact power feeding device includes a plurality of resonance circuits that receive power from a power transmitter device, and a power receiver circuit that outputs, to a load circuit, the power received from the power transmitter device by the plurality of resonance circuits. Each of the plurality of resonance circuits includes a receiver coil that receives power from a transmitter coil of the power transmitter device, and a resonance capacitor that resonates, together with the receiver coil, with AC power supplied to the transmitter coil of the power transmitter device. The receiver coils of the plurality of resonance circuits are arranged so as to be electromagnetically coupled to each other.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: April 9, 2024
    Assignee: OMRON CORPORATION
    Inventor: Goro Nakao
  • Publication number: 20230336028
    Abstract: A power transmission device includes power transmission coils, at least one power supply circuit, a communicator, and a control circuit. The power transmission coils transmit power to a power reception device via a power reception coil. The at least one power supply circuit supplies AC power to the power transmission coils, respectively. The communicator receives a signal indicating a power reception status of the power reception device from the power reception device. According to the power reception status, the control circuit selects a power transmission coil with a highest efficiency of power transmission to the power reception device among the power transmission coils to serve as the power transmission coil for power transmission to the power reception device, and controls the at least one power supply circuit so that AC power is supplied to the selected power transmission coil and is not supplied to an unselected power transmission coil.
    Type: Application
    Filed: March 9, 2023
    Publication date: October 19, 2023
    Applicant: OMRON Corporation
    Inventors: Takashi OHTA, Yusuke Kawai, Goro Nakao
  • Publication number: 20230187983
    Abstract: A power transmitting apparatus included in the contactless power feeding apparatus includes a power supply circuit that supplies AC power having a predetermined drive frequency to a transmission coil for supplying power to a power receiving apparatus, a first coil and a first capacitor that are connected between the power supply circuit and the transmission coil, a second capacitor that is connected at first end to the first capacitor and is connected at a second end to the second end of the transmission coil, and a control circuit. Also, the power receiving apparatus includes a receiver coil for receiving power, and a resonant circuit that includes a resonance capacitor that resonates together with the receiver coil. Also, the control circuit of the power transmitting apparatus controls the power supply circuit such that the predetermined drive frequency falls within a predetermined frequency range including a resonance frequency of the resonant circuit.
    Type: Application
    Filed: November 22, 2022
    Publication date: June 15, 2023
    Applicant: OMRON Corporation
    Inventors: Goro NAKAO, Hiroaki OTA, Yuki ITO, Kenichi TABATA, Atsushi NOMURA, Daiki ANDO, Ken ONOZAKA, Yusuke KAWAI, Mitsunori SUGIURA
  • Publication number: 20230187982
    Abstract: A power transmitting apparatus included in a contactless power feeding apparatus includes a power supply circuit that supplies AC power having a predetermined drive frequency to a transmission coil for supplying power to a power receiving apparatus, a power receiving circuit that receives returning power transmitted from the power receiving apparatus, a control circuit that controls, according to a voltage of the returning power, the power supply circuit such that an output voltage of the power receiving apparatus is in a predetermined allowable range. Also, the power receiving apparatus includes a resonant circuit for receiving power via the transmission coil of the power transmitting apparatus, a rectifier circuit that rectifies power received via the resonant circuit, and a power transmitting circuit that transmits the returning power according to a voltage of power output from the rectifier circuit to the power transmitting apparatus.
    Type: Application
    Filed: November 21, 2022
    Publication date: June 15, 2023
    Applicant: OMRON Corporation
    Inventors: Goro NAKAO, Hiroaki OTA, Ken ONOZAKA, Yuki ITO, Taichi MISHIMA, Yusuke KAWAI
  • Patent number: 11652368
    Abstract: A power transmission device includes a transmission coil that supplies power to a power reception device, a power supply circuit that converts DC power supplied from a DC power source via a plurality of switching elements connected in a full bridge shape or a half bridge shape between DC power sources and the transmission coil into AC power and supplies the AC power to the transmission coil, a phase adjustment circuit having an LC series circuit connected in parallel with the transmission coil and a switching element connected in series with the LC series circuit, and a control circuit that controls switching on and off of the switching element of the phase adjustment circuit in accordance with a measured value of an amount of current when any of the plurality of switching elements of the power supply circuit is turned off by a current detection circuit.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: May 16, 2023
    Assignee: OMRON Corporation
    Inventors: Goro Nakao, Atsushi Nomura, Yusuke Kawai, Masanobu Nakajo
  • Patent number: 11637451
    Abstract: A power transmitter device of a non-contact power feeding device includes a transmitter coil configured to supply power to the power receiver device, a power supply circuit including a plurality of switching elements connected between a DC power supply and the transmitter coil in a full-bridge configuration or a half-bridge configuration. The power supply circuit may be configured to switch the plurality of switching elements to an on or off state at a switching frequency to convert DC power supplied from the DC power supply into AC power having the switching frequency and supply the AC power to the transmitter coil, and a phase control circuit including at least one LC series circuit connected to both ends of the transmitter coil.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: April 25, 2023
    Assignee: OMRON Corporation
    Inventors: Goro Nakao, Kenichi Tabata, Yusuke Kawai, Atsushi Nomura, Takahiro Takeyama, Masanobu Nakajo
  • Publication number: 20230094624
    Abstract: A foreign object detector includes detection coils between a transmitter coil in a transmitter device and a receiver coil in a receiver device, a power supply circuit that supplies AC power having a predetermined frequency to each detection coil through a feeder coil located to be electromagnetically coupled to each detection coil, and a detection circuit that detects, while power to be transmitted to the receiver coil is being supplied to the transmitter coil, a criteria voltage to be a criterion for foreign object detection output from each detection coil at a start of power supply from the power supply circuit and outputs a signal to stop power supply to the transmitter coil in response to the criteria voltage for any detection coil deviating from a predetermined range. The transmitter device transmits power to the receiver device contactlessly.
    Type: Application
    Filed: January 20, 2021
    Publication date: March 30, 2023
    Applicant: OMRON Corporation
    Inventors: Takanori IMAZAWA, Goro NAKAO
  • Publication number: 20230079460
    Abstract: A foreign object detector includes multiple detection coils located between a transmitter coil in a transmitter device and a receiver coil in a receiver device to be electromagnetically coupled to one another, multiple capacitors each forming a resonant circuit together with a corresponding detection coil of the detection coils, a power supply circuit that supplies alternating current power having a predetermined frequency to each of the detection coils through a feeder coil located to be electromagnetically coupled to each of the detection coils, and a detection circuit that detects a voltage output from each of the detection coils and detects a foreign object between the transmitter coil and the receiver coil based on the detected voltage. The transmitter device transmits power to the receiver device contactlessly.
    Type: Application
    Filed: January 18, 2021
    Publication date: March 16, 2023
    Applicant: OMRON Corporation
    Inventors: Takanori IMAZAWA, Goro NAKAO
  • Patent number: 11456624
    Abstract: A power reception device of a non-contact power feeding device has: a resonant circuit having a reception coil configured to receive electric power from a power transmission device and a resonant capacitor connected in series with the reception coil; a first rectifier circuit configured to rectify electric power received via the resonant circuit; a smoothing capacitor connected to the first rectifier circuit and configured to smooth a voltage outputted from the first rectifier circuit; a sub-coil arranged to be capable of being electromagnetically coupled to the reception coil; and a second rectifier circuit connected between the sub-coil and the smoothing capacitor, and configured to output electric power according to a voltage generated in the sub-coil to the smoothing capacitor in response to a voltage obtained by rectifying a voltage generated in the sub-coil being higher than a voltage between both terminals of the smoothing capacitor.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: September 27, 2022
    Assignee: OMRON OORPORATION
    Inventors: Goro Nakao, Kenichi Tabata, Yusuke Kawai, Atsushi Nomura, Takahiro Takeyama, Masanobu Nakajo
  • Patent number: 11456626
    Abstract: A power transfer device includes a power transfer coil that transfers power to another device in a non-contact manner, a power transmission and reception circuit that supplies power to the power transfer coil or outputs power received by the power transfer coil to a load circuit, and a protection coil disposed between the power transfer coil and the power transmission and reception circuit to prevent a magnetic flux generated by the power transfer coil from reaching the power transmission and reception circuit. The protection coil includes an air-core coil formed of a wiring pattern of a conductor provided on a board disposed between the power transfer coil and the power transmission and reception circuit, and at least one core coil connected in series to the air-core coil.
    Type: Grant
    Filed: March 2, 2020
    Date of Patent: September 27, 2022
    Assignee: OMRON CORPORATION
    Inventors: Kenichi Tabata, Goro Nakao, Yusuke Kawai, Atsushi Nomura, Masanobu Nakajo, Takahiro Takeyama
  • Patent number: 11444490
    Abstract: A power transmission device of a non-contact power feeding device according one or more embodiments may include a control circuit configured to control at least one of a switching frequency or a voltage of AC power supplied from a power supply circuit to a transmission coil, on the basis of a change over time in a strength of a magnetic field detected by a magnetic field detection element configured to detect a strength of a magnetic field generated from the transmission coil of the power transmission device. Whereas, a power reception device has a resonant circuit having a reception coil configured to receive electric power from the power transmission device and a resonance suppression coil arranged to be capable of being electromagnetically coupled to the reception coil.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: September 13, 2022
    Assignee: OMRON Corporation
    Inventors: Goro Nakao, Yusuke Kawai, Kenichi Tabata, Atsushi Nomura, Takahiro Takeyama, Masanobu Nakajo
  • Patent number: 11422281
    Abstract: A foreign matter detecting device includes a plurality of detection coils disposed so as to be capable of being electromagnetically coupled to each other between a transmission coil of a power transmission device and a reception coil of a power reception device between which power is transmitted in a non-contact manner, a plurality of capacitors each forming a resonance circuit together with each of the plurality of detection coils, a power supply circuit supplying AC power having a predetermined frequency to an input coil that is one of the plurality of detection coils, and a detection circuit detecting a voltage of AC power transmitted via the plurality of detection coils from an output coil that one of the plurality of detection coils and is different from the input coil, and detecting foreign matter entrapped between the transmission coil and the reception coil according to the voltage detected.
    Type: Grant
    Filed: July 22, 2020
    Date of Patent: August 23, 2022
    Assignee: OMRON CORPORATION
    Inventors: Goro Nakao, Takanori Imazawa
  • Publication number: 20220216736
    Abstract: A power transfer device includes a power transfer coil that transfers power to another device in a non-contact manner, a power transmission and reception circuit that supplies power to the power transfer coil or outputs power received by the power transfer coil to a load circuit, and a protection coil disposed between the power transfer coil and the power transmission and reception circuit to prevent a magnetic flux generated by the power transfer coil from reaching the power transmission and reception circuit. The protection coil includes an air-core coil formed of a wiring pattern of a conductor provided on a board disposed between the power transfer coil and the power transmission and reception circuit, and at least one core coil connected in series to the air-core coil.
    Type: Application
    Filed: March 2, 2020
    Publication date: July 7, 2022
    Applicant: OMRON Corporation
    Inventors: Kenichi TABATA, Goro NAKAO, Yusuke KAWAI, Atsushi NOMURA, Masanobu NAKAJO, Takahiro TAKEYAMA
  • Patent number: 11329513
    Abstract: A contactless power transmission apparatus includes a transmitter that includes a transmitter coil that supplies electric power to a receiver and a power supply circuit that supplies alternating current power to the transmitter coil. The receiver includes a resonant circuit including a receiver coil that receives electric power from the transmitter and a resonant capacitor connected in series to the receiver coil, a rectifier circuit that rectifies electric power output from the resonant circuit, and a coil connected in parallel to the resonant circuit between the resonant circuit and the rectifier circuit.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: May 10, 2022
    Assignee: OMRON Corporation
    Inventors: Goro Nakao, Yusuke Kawai, Atsushi Nomura, Toshiyuki Zaitsu, Takeshi Uematsu
  • Publication number: 20220140655
    Abstract: A power receiver device of a non-contact power feeding device includes a plurality of resonance circuits that receive power from a power transmitter device, a voltage detection circuit that detects an output voltage from the plurality of resonance circuits, and a control circuit. Receiver coils of the plurality of resonance circuits are arranged so as to be electromagnetically coupled to each other. At least one of resonance circuits includes a variable capacitance circuit that is connected to the receiver coil of the resonance circuit and is regulatable in capacitance. The control circuit regulates the capacitance of the variable capacitance circuit in accordance with the output voltage.
    Type: Application
    Filed: March 4, 2020
    Publication date: May 5, 2022
    Applicant: OMRON Corporation
    Inventors: Goro NAKAO, Toshiyuki ZAITSU
  • Publication number: 20220131414
    Abstract: A power receiver device of a non-contact power feeding device includes a plurality of resonance circuits that receive power from a power transmitter device, and a power receiver circuit that outputs, to a load circuit, the power received from the power transmitter device by the plurality of resonance circuits. Each of the plurality of resonance circuits includes a receiver coil that receives power from a transmitter coil of the power transmitter device, and a resonance capacitor that resonates, together with the receiver coil, with AC power supplied to the transmitter coil of the power transmitter device. The receiver coils of the plurality of resonance circuits are arranged so as to be electromagnetically coupled to each other.
    Type: Application
    Filed: March 6, 2020
    Publication date: April 28, 2022
    Applicant: OMRON Corporation
    Inventor: Goro NAKAO
  • Publication number: 20220123592
    Abstract: A power transmission device of a non-contact power feeding device according one or more embodiments may include a control circuit configured to control at least one of a switching frequency or a voltage of AC power supplied from a power supply circuit to a transmission coil, on the basis of a change over time in a strength of a magnetic field detected by a magnetic field detection element configured to detect a strength of a magnetic field generated from the transmission coil of the power transmission device. Whereas, a power reception device has a resonant circuit having a reception coil configured to receive electric power from the power transmission device and a resonance suppression coil arranged to be capable of being electromagnetically coupled to the reception coil.
    Type: Application
    Filed: October 16, 2019
    Publication date: April 21, 2022
    Applicant: OMRON Corporation
    Inventors: Goro NAKAO, Yusuke KAWAI, Kenichi TABATA, Atsushi NOMURA, Takahiro TAKEYAMA, Masanobu NAKAJO
  • Publication number: 20220085650
    Abstract: A measured value of an output voltage may be obtained by rectifying power received through a resonance circuit including a reception coil that receives power from a transmission coil of a power transmission device and a resonance capacitor connected in series with the reception coil. When the measured value becomes equal to or larger than an upper limit threshold value, a power reception device of a non-contact power supply device short-circuits a resonance suppression coil provided so as to be electromagnetically couplable with the reception coil. The power transmission device and the power reception device are provided such that power is transmitted from the transmission coil to the reception coil, and the reception coil and the resonance suppression coil are provided such that a coupling degree between the resonance suppression coil and the transmission coil becomes higher than a coupling degree between the reception coil and the transmission coil.
    Type: Application
    Filed: December 3, 2019
    Publication date: March 17, 2022
    Applicant: OMRON Corporation
    Inventors: Atsushi NOMURA, Goro NAKAO, Yusuke KAWAI, Masanobu NAKAJO, Takahiro TAKEYAMA, Kenichi TABATA
  • Publication number: 20220052558
    Abstract: A power transmission device includes a transmission coil that supplies power to a power reception device, a power supply circuit that converts DC power supplied from a DC power source via a plurality of switching elements connected in a full bridge shape or a half bridge shape between DC power sources and the transmission coil into AC power and supplies the AC power to the transmission coil, a phase adjustment circuit having an LC series circuit connected in parallel with the transmission coil and a switching element connected in series with the LC series circuit, and a control circuit that controls switching on and off of the switching element of the phase adjustment circuit in accordance with a measured value of an amount of current when any of the plurality of switching elements of the power supply circuit is turned off by a current detection circuit.
    Type: Application
    Filed: December 3, 2019
    Publication date: February 17, 2022
    Applicant: OMRON Corporation
    Inventors: Goro NAKAO, Atsushi NOMURA, Yusuke KAWAI, Masanobu NAKAJO
  • Patent number: 11245291
    Abstract: A power transmission device 2 for a non-contact power supply device 1 has a transmission coil 14 and a power supply circuit 10 that supplies, to the transmission coil 14, AC power having a switching frequency at which the transmission coil 14 does not resonate. In addition, a power reception device 3 for the non-contact power supply device 1 has: a resonance circuit 20 that has a reception coil 21 and a resonance capacitor 22 resonating in parallel and a first coil 23 connected in series or parallel to the reception coil 21; and a coil 23 connected in series to the reception coil 21.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: February 8, 2022
    Assignee: Omron Corporation
    Inventors: Goro Nakao, Yusuke Kawai, Toshiyuki Zaitsu