Patents by Inventor Kiyoto Matsui

Kiyoto Matsui 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: 11070086
    Abstract: A power receiving unit includes a secondary resonant coil for receiving electric power from a primary resonant coil using magnetic resonance or electric field resonance, a secondary coil capable of changing a number of turns or a pitch of a winding for receiving the electric power from the secondary resonant coil using electromagnetic induction, a rectification circuit, and a controller. The electric power received by the secondary coil is rectified by the rectification circuit, and transmitted to a DC-DC converter for supplying the electric power to a load circuit. The controller changes the number of turns or the pitch of the winding of the secondary coil such that an input voltage of the DC-DC converter does not exceed an upper limit, based on a magnitude of the electric power received from the primary resonant coil.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: July 20, 2021
    Assignee: FUJITSU LIMITED
    Inventors: Hirotaka Oshima, Kiyoto Matsui
  • Patent number: 10454311
    Abstract: A power transmitting apparatus includes a plurality of primary-side resonant coils disposed along a conveyance path of a plurality of electronic devices and configured to utilize magnetic field resonance to transmit electric power to secondary-side resonant coils of the respective electronic devices conveyed along the conveyance path; and a plurality of phase adjusters connected between an alternating-current source and the respective primary-side resonant coils and configured to respectively adjust phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source, so as to uniform the phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source.
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: October 22, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Kiyoto Matsui, Satoshi Shimokawa
  • Patent number: 10381859
    Abstract: A wireless power supply system includes: a power transmitter; and power receivers configured to receive power through magnetic field resonance or electric field resonance. The transmitter groups the receivers into first groups based on degrees of coupling between the transmitter and the respective receivers in an initial state. The transmitter calculates, for the respective first groups, charging times required to charge the receivers, and a first total charging time for the first groups. The transmitter sets degrees of coupling greater than or equal to the degrees of coupling in the initial state, and again groups the receivers into second groups based on the set degrees. The transmitter calculates, for the respective second groups, charging times required to charge the receivers and a second total for the second groups, and starts to transmit the power when the second total time is less than or equal to the first total time.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: August 13, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Kiyoto Matsui, Akiyoshi Uchida
  • Patent number: 10276900
    Abstract: A rechargeable battery includes: a battery body including a cylindrical outer peripheral side surface; and a power receiving coil wound in at most a single layer around the outer peripheral side surface, and electrically connected to the battery body. The power receiving coil is helically wound around the outer peripheral side surface while forming a space from which the outer peripheral side surface is exposed.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: April 30, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Hiroyasu Kawano, Akiyoshi Uchida, Satoshi Shimokawa, Kiyoto Matsui, Kazuyuki Ozaki, Masakazu Taguchi
  • Publication number: 20180287427
    Abstract: A power receiving unit includes a secondary resonant coil for receiving electric power from a primary resonant coil using magnetic resonance or electric field resonance, a secondary coil capable of changing a number of turns or a pitch of a winding for receiving the electric power from the secondary resonant coil using electromagnetic induction, a rectification circuit, and a controller. The electric power received by the secondary coil is rectified by the rectification circuit, and transmitted to a DC-DC converter for supplying the electric power to a load circuit. The controller changes the number of turns or the pitch of the winding of the secondary coil such that an input voltage of the DC-DC converter does not exceed an upper limit, based on a magnitude of the electric power received from the primary resonant coil.
    Type: Application
    Filed: February 22, 2018
    Publication date: October 4, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Hirotaka OSHIMA, Kiyoto MATSUI
  • Publication number: 20180197678
    Abstract: A wireless power transfer system includes a plurality of power sources and at least one power receiver, in which power transfer from the power sources to the power receiver is performed in wireless by using magnetic field resonance or electric field resonance. In the system, one of the plurality of power sources is designated as a master power source and the other one or more power sources are designated as slave power sources. In addition, the master power source controls the plurality of power sources and the at least one power receiver to perform the power transfer. This allows the system to perform the power transfer in an optimum state.
    Type: Application
    Filed: March 9, 2018
    Publication date: July 12, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Akiyoshi UCHIDA, Kazuyuki OZAKI, Masakazu TAGUCHI, Satoshi SHIMOKAWA, Hiroyasu KAWANO, Kiyoto MATSUI
  • Patent number: 9953763
    Abstract: A wireless power transfer system includes a plurality of power sources and at least one power receiver, in which power transfer from the power sources to the power receiver is performed in wireless by using magnetic field resonance or electric field resonance. In the system, one of the plurality of power sources is designated as a master power source and the other one or more power sources are designated as slave power sources. In addition, the master power source controls the plurality of power sources and the at least one power receiver to perform the power transfer. This allows the system to perform the power transfer in an optimum state.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: April 24, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Akiyoshi Uchida, Kazuyuki Ozaki, Masakazu Taguchi, Satoshi Shimokawa, Hiroyasu Kawano, Kiyoto Matsui
  • Publication number: 20170366034
    Abstract: A wireless power supply system includes: a power transmitter; and power receivers configured to receive power through magnetic field resonance or electric field resonance. The transmitter groups the receivers into first groups based on degrees of coupling between the transmitter and the respective receivers in an initial state. The transmitter calculates, for the respective first groups, charging times required to charge the receivers, and a first total charging time for the first groups. The transmitter sets degrees of coupling greater than or equal to the degrees of coupling in the initial state, and again groups the receivers into second groups based on the set degrees. The transmitter calculates, for the respective second groups, charging times required to charge the receivers and a second total for the second groups, and starts to transmit the power when the second total time is less than or equal to the first total time.
    Type: Application
    Filed: September 7, 2017
    Publication date: December 21, 2017
    Applicant: FUJITSU LIMITED
    Inventors: Kiyoto Matsui, Akiyoshi Uchida
  • Patent number: 9672979
    Abstract: A power transmitting apparatus includes a power transmission or reception circuit, a first coil connected to the power transmission or reception circuit through wires, a plurality of resonance coils having respective, different diameters one of which is selectively coupled to the first coil through electromagnetic induction, and a position control apparatus configured to control the positions of the resonance coils, wherein the position control apparatus is configured to selectively align an axial direction of one of the resonance coils with an axial direction of the first coil.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: June 6, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Kiyoto Matsui, Satoshi Shimokawa
  • Patent number: 9558884
    Abstract: A power transmission apparatus includes a cover part attached to one of a power transmitter and an electronic apparatus, the power transmitter including a primary-side coil connected to an alternating-current power supply and a primary-side resonant coil configured to receive power from the primary-side coil by electromagnetic induction, the electronic apparatus including a secondary-side coil; and a secondary-side resonant coil disposed in the cover part, and configured to transmit to the secondary-side coil the power received from the primary-side resonant coil by magnetic field resonance generated between the primary-side resonant coil and the secondary-side resonant coil.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: January 31, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Satoshi Shimokawa, Akiyoshi Uchida, Hiroyasu Kawano, Kiyoto Matsui, Masakazu Taguchi
  • Publication number: 20160352154
    Abstract: A power transmitting apparatus includes a plurality of primary-side resonant coils disposed along a conveyance path of a plurality of electronic devices and configured to utilize magnetic field resonance to transmit electric power to secondary-side resonant coils of the respective electronic devices conveyed along the conveyance path; and a plurality of phase adjusters connected between an alternating-current source and the respective primary-side resonant coils and configured to respectively adjust phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source, so as to uniform the phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source.
    Type: Application
    Filed: August 15, 2016
    Publication date: December 1, 2016
    Applicant: FUJITSU LIMITED
    Inventors: Kiyoto Matsui, SATOSHI SHIMOKAWA
  • Patent number: 9362985
    Abstract: A portable apparatus includes a case, a coil situated inside the case, a circuit disposed inside the case to receive power based on a first frequency via the coil and to perform communication based on a second frequency higher than the first frequency, and a magnetic shield having a first portion and a second portion stacked one over another in a direction perpendicular to the coil between the coil and an inside of the case, the second portion being closer to the coil than the first portion, wherein permeability of the first portion is higher than permeability of the second portion situated toward the coil with respect to the first frequency.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: June 7, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Akiyoshi Uchida, Masakazu Taguchi, Satoshi Shimokawa, Kiyoto Matsui, Hiroyasu Kawano
  • Patent number: 9350196
    Abstract: A non-contact charging apparatus configured to, vary the inductance and the capacitance of the matching unit for matching the impedance of the power supply system that supplies alternate current power and the impedance of the power transmitting/receiving system including a power transmitting unit and a power receiving apparatus according to the variable information.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: May 24, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Akiyoshi Uchida, Masakazu Taguchi, Kiyoto Matsui, Hiroyasu Kawano, Satoshi Shimokawa
  • Publication number: 20160049698
    Abstract: A rechargeable battery includes: a battery body including a cylindrical outer peripheral side surface; and a power receiving coil wound in at most a single layer around the outer peripheral side surface, and electrically connected to the battery body. The power receiving coil is helically wound around the outer peripheral side surface while forming a space from which the outer peripheral side surface is exposed.
    Type: Application
    Filed: October 29, 2015
    Publication date: February 18, 2016
    Applicant: FUJITSU LIMITED
    Inventors: Hiroyasu KAWANO, Akiyoshi UCHIDA, Satoshi SHIMOKAWA, Kiyoto MATSUI, Kazuyuki OZAKI, Masakazu TAGUCHI
  • Patent number: 9130386
    Abstract: A wireless power transmitting device includes a housing configured to have a feeding surface on which a power receiving device is to be placed; a power transmitting coil disposed inside the housing and configured to have a central axis that intersects with the feeding surface; and an alternating-current power supply configured to supply power to the power transmitting coil, wherein the feeding surface has raised and recessed portions in an area corresponding to a region inside an outer region of the power transmitting coil.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: September 8, 2015
    Assignee: FUJITSU LIMITED
    Inventors: Hiroyasu Kawano, Kiyoto Matsui, Masakazu Taguchi, Satoshi Shimokawa, Akiyoshi Uchida
  • Publication number: 20150008736
    Abstract: A wireless power transfer system includes a plurality of power sources and at least one power receiver, in which power transfer from the power sources to the power receiver is performed in wireless by using magnetic field resonance or electric field resonance. In the system, one of the plurality of power sources is designated as a master power source and the other one or more power sources are designated as slave power sources. In addition, the master power source controls the plurality of power sources and the at least one power receiver to perform the power transfer. This allows the system to perform the power transfer in an optimum state.
    Type: Application
    Filed: September 22, 2014
    Publication date: January 8, 2015
    Inventors: Akiyoshi Uchida, Kazuyuki Ozaki, MASAKAZU TAGUCHI, SATOSHI SHIMOKAWA, Hiroyasu KAWANO, Kiyoto Matsui
  • Publication number: 20140333151
    Abstract: A power transmitting apparatus includes a power transmission or reception circuit, a first coil connected to the power transmission or reception circuit through wires, a plurality of resonance coils having respective, different diameters one of which is selectively coupled to the first coil through electromagnetic induction, and a position control apparatus configured to control the positions of the resonance coils, wherein the position control apparatus is configured to selectively align an axial direction of one of the resonance coils with an axial direction of the first coil.
    Type: Application
    Filed: July 28, 2014
    Publication date: November 13, 2014
    Inventors: Kiyoto Matsui, SATOSHI SHIMOKAWA
  • Publication number: 20140253029
    Abstract: A non-contact charging apparatus configured to, vary the inductance and the capacitance of the matching unit for matching the impedance of the power supply system that supplies alternate current power and the impedance of the power transmitting/receiving system including a power transmitting unit and a power receiving apparatus according to the variable information.
    Type: Application
    Filed: May 22, 2014
    Publication date: September 11, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Akiyoshi Uchida, MASAKAZU TAGUCHI, Kiyoto Matsui, Hiroyasu KAWANO, SATOSHI SHIMOKAWA
  • Publication number: 20140159502
    Abstract: A power transmission apparatus includes a cover part attached to one of a power transmitter and an electronic apparatus, the power transmitter including a primary-side coil connected to an alternating-current power supply and a primary-side resonant coil configured to receive power from the primary-side coil by electromagnetic induction, the electronic apparatus including a secondary-side coil; and a secondary-side resonant coil disposed in the cover part, and configured to transmit to the secondary-side coil the power received from the primary-side resonant coil by magnetic field resonance generated between the primary-side resonant coil and the secondary-side resonant coil.
    Type: Application
    Filed: February 18, 2014
    Publication date: June 12, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Satoshi Shimokawa, Akiyoshi Uchida, Hiroyasu Kawano, Kiyoto Matsui, Masakazu Taguchi
  • Patent number: 8666459
    Abstract: Cellular phones include a power reception resonance coil arranged inside a first outer surface side of a housing, a power extracting unit for extracting power of an induction current of the power reception resonance coil, a magnetic core that has one end arranged inside the first outer surface side and the other end arranged inside a second outer surface side of the housing, and penetrates into the power reception resonance coil, and a printed board that is arranged in a space between the first outer surface and the second outer surface and has an area where circuit elements are not arranged on a periphery of the core.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: March 4, 2014
    Assignee: Fujitsu Limited
    Inventors: Kiyoto Matsui, Masakazu Taguchi, Hiroyasu Kawano, Satoshi Shimokawa, Akiyoshi Uchida