Patents by Inventor Masahide Ohnishi

Masahide Ohnishi 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: 11139700
    Abstract: Disclosed herein is a leakage detector provided in a device having a conversion circuit that converts a DC voltage and an AC voltage from one to the other and a grounded metal member. The leakage detector comprises: an average voltage detection circuit that detects the average voltage of voltages corresponding to a potential difference between a high-voltage-side terminal or a low-voltage-side terminal on the DC side of the conversion circuit and the metal member; and a leakage detection circuit that detects the presence/absence of a leakage based on the average voltage detected by the average voltage detection circuit.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: October 5, 2021
    Assignee: TDK CORPORATION
    Inventors: Kazunori Oshima, Masahide Ohnishi
  • Patent number: 10964473
    Abstract: The coil unit includes a planar coil, a magnetic body and a capacitor module, the capacitor module has a substrate, capacitor elements mounted on the substrate, and a first connecting terminal and a second connecting terminal provided outside an element region on which capacitor elements are mounted, the first connecting terminal is provided inside a winding section as viewed in a plan view, the second connecting terminal is provided outside the winding section as viewed in a plan view, a direction in which the first connecting terminal and the second connecting terminal are connected is perpendicular to a direction in which the conductor extends in the winding section of the planar coil, the coil unit in which the element region is provided in a range overlapping the winding section of the coil as viewed in a plan view is selected.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: March 30, 2021
    Assignee: TDK CORPORATION
    Inventors: Takuya Murashige, Shoma Asai, Masahide Ohnishi
  • Patent number: 10903691
    Abstract: A wireless power receiver is provided with a power reception unit, a rectifier circuit including first to fourth diodes and first and second capacitors and converting AC power into DC, an anode of the first diode and a cathode of the second diode being connected to one output end of the power reception unit, an anode of the third diode and a cathode of the fourth diode being connected to the other output end thereof, and first and second capacitors being connected in parallel, respectively, to the third and fourth diodes, a protection circuit including a first switching element connected between the other output end of the power reception unit and an output end of the rectifier circuit, and a control circuit that controls the first switching element based on output voltage of the rectifier circuit and inter-terminal voltage of the first or second capacitor.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: January 26, 2021
    Assignee: TDK CORPORATION
    Inventors: Ryo Miyazawa, Masahide Ohnishi, Akihiro Ii
  • Publication number: 20190304678
    Abstract: The coil unit includes a planar coil, a magnetic body and a capacitor module, the capacitor module has a substrate, capacitor elements mounted on the substrate, and a first connecting terminal and a second connecting terminal provided outside an element region on which capacitor elements are mounted, the first connecting terminal is provided inside a winding section as viewed in a plan view, the second connecting terminal is provided outside the winding section as viewed in a plan view, a direction in which the first connecting terminal and the second connecting terminal are connected is perpendicular to a direction in which the conductor extends in the winding section of the planar coil, the coil unit in which the element region is provided in a range overlapping the winding section of the coil as viewed in a plan view is selected.
    Type: Application
    Filed: March 28, 2019
    Publication date: October 3, 2019
    Applicant: TDK CORPORATION
    Inventors: Takuya MURASHIGE, Shoma ASAI, Masahide OHNISHI
  • Publication number: 20190299800
    Abstract: A wireless power transmission device capable of preventing a lifespan of a capacitor that smooths a voltage rectified by a rectification circuit from being shortened, including a power transmission coil magnetically coupled to the power receiving coil, a rectification circuit that rectifies a supplied AC voltage, a first capacitor that smooths a voltage supplied from the rectification circuit into DC voltage, a power transmission circuit that converts the DC voltage smoothed by the first capacitor into AC voltage at a driving frequency, and a second capacitor that bypasses between two transmission paths connecting the circuits, the second capacitor is provided on the power transmission circuit side relative to the first capacitor between the rectification circuit and the power transmission circuit, and the device includes an inductor or rectification element between the first and second capacitor in the high potential side transmission path among the two transmission paths.
    Type: Application
    Filed: March 27, 2019
    Publication date: October 3, 2019
    Applicant: TDK CORPORATION
    Inventors: Ryo MIYAZAWA, Masahide OHNISHI
  • Patent number: 10374467
    Abstract: A coil unit provided on a ground side, including a coil, at least one sensor for detecting an object existing above or around the coil unit, a housing for accommodating the coil and the at least one sensor, wherein, the housing is provided with a dividing plate and at least one pillar for maintaining the internal space of the space for sensor, the dividing plate divides the space into a space for coil and a space for sensor located vertically above the space for coil, the space for coil is for accommodating the coil and the space for sensor is for accommodating the at least one sensor, and the at least one sensor is disposed on the dividing plate without contacting with an upper inner surface portion of the housing in the space for sensor.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: August 6, 2019
    Assignee: TDK CORPORATION
    Inventors: Takuya Murashige, Masahide Ohnishi, Masayuki Sugasawa, Masayuki Kobayashi
  • Publication number: 20190165611
    Abstract: A wireless power receiver is provided with a power reception unit, a rectifier circuit including first to fourth diodes and first and second capacitors and converting AC power into DC, an anode of the first diode and a cathode of the second diode being connected to one output end of the power reception unit, an anode of the third diode and a cathode of the fourth diode being connected to the other output end thereof, and first and second capacitors being connected in parallel, respectively, to the third and fourth diodes, a protection circuit including a first switching element connected between the other output end of the power reception unit and an output end of the rectifier circuit, and a control circuit that controls the first switching element based on output voltage of the rectifier circuit and inter-terminal voltage of the first or second capacitor.
    Type: Application
    Filed: November 28, 2018
    Publication date: May 30, 2019
    Applicant: TDK Corporation
    Inventors: Ryo MIYAZAWA, Masahide OHNISHI, Akihiro II
  • Patent number: 10298069
    Abstract: A wireless power receiving device, for wirelessly receiving electric power from a wireless power feeding device, includes: a power receiving side resonant circuit having a power receiving coil wirelessly receiving power from a power feeding side and a power receiving side resonant capacitor; a rectifier circuit in which the power received by the power receiving coil is rectified to be output to a load; a power receiving side voltage detecting portion for detecting the output voltage of the rectifier circuit; a short circuit having a switching element connected between an output portion of the power receiving side resonant circuit and an output portion of the rectifier circuit, and a rectifying element inserted between the output portion of the power receiving side resonant circuit and the switching element; and a controlling circuit which operates the switching element when a value of the output voltage exceeds a preset reference voltage value.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: May 21, 2019
    Assignee: TDK CORPORATION
    Inventors: Kota Arasaki, Masahide Ohnishi
  • Publication number: 20180375387
    Abstract: Disclosed herein is a leakage detector provided in a device having a conversion circuit that converts a DC voltage and an AC voltage from one to the other and a grounded metal member. The leakage detector comprises: an average voltage detection circuit that detects the average voltage of voltages corresponding to a potential difference between a high-voltage-side terminal or a low-voltage-side terminal on the DC side of the conversion circuit and the metal member; and a leakage detection circuit that detects the presence/absence of a leakage based on the average voltage detected by the average voltage detection circuit.
    Type: Application
    Filed: June 22, 2018
    Publication date: December 27, 2018
    Applicant: TDK CORPORATION
    Inventors: Kazunori OSHIMA, Masahide OHNISHI
  • Patent number: 9966999
    Abstract: To provide a wireless power receiving device, and a wireless power transmission device capable of improving the reliability of a protection circuit while preventing breakage of a circuit element upon occurrence of any abnormality, such as overvoltage or overcurrent. A wireless power receiving device includes a power receiving coil; a rectifier unit that performs full-wave rectification of the power received by the power receiving coil and supplies the power to a load; power-receiving-side detecting unit that detects an output voltage value or an output current value from the rectifier unit; and switching unit that short-circuits one of two current paths through the rectifier unit if the value detected by the power-receiving-side detecting unit exceeds a predetermined reference value.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: May 8, 2018
    Assignee: TDK CORPORATION
    Inventors: Tsunehiro Saen, Masahide Ohnishi, Ryo Miyazawa
  • Publication number: 20180090995
    Abstract: A wireless power receiving device, for wirelessly receiving electric power from a wireless power feeding device, includes: a power receiving side resonant circuit having a power receiving coil wirelessly receiving power from a power feeding side and a power receiving side resonant capacitor; a rectifier circuit in which the power received by the power receiving coil is rectified to be output to a load; a power receiving side voltage detecting portion for detecting the output voltage of the rectifier circuit; a short circuit having a switching element connected between an output portion of the power receiving side resonant circuit and an output portion of the rectifier circuit, and a rectifying element inserted between the output portion of the power receiving side resonant circuit and the switching element; and a controlling circuit which operates the switching element when a value of the output voltage exceeds a preset reference voltage value.
    Type: Application
    Filed: March 30, 2016
    Publication date: March 29, 2018
    Applicant: TDK CORPORATION
    Inventors: Kota ARASAKI, Masahide OHNISHI
  • Publication number: 20170288469
    Abstract: A coil unit provided on a ground side, including a coil, at least one sensor for detecting an object existing above or around the coil unit, a housing for accommodating the coil and the at least one sensor, wherein, the housing is provided with a dividing plate and at least one pillar for maintaining the internal space of the space for sensor, the dividing plate divides the space into a space for coil and a space for sensor located vertically above the space for coil, the space for coil is for accommodating the coil and the space for sensor is for accommodating the at least one sensor, and the at least one sensor is disposed on the dividing plate without contacting with an upper inner surface portion of the housing in the space for sensor.
    Type: Application
    Filed: March 29, 2017
    Publication date: October 5, 2017
    Applicant: TDK CORPORATION
    Inventors: Takuya MURASHIGE, Masahide OHNISHI, Masayuki SUGASAWA, Masayuki KOBAYASHI
  • Patent number: 9728979
    Abstract: The present invention provides a contactless power transmission circuit which is capable of narrowing a fluctuation extent of an output voltage output by a power receiving coil via a rectifier circuit. The contactless power transmission circuit controls a period of an alternating voltage output from a driving circuit based on a smaller one of either of a first command value and a second command value. Here, the first command value is one based on a difference between a detected value of the output voltage from the rectifier circuit and a target value. The second command value is one calculated based on a difference between a detected value of a transmission current flowing through the power transmitting coil and a target value.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: August 8, 2017
    Assignee: TDK CORPORATION
    Inventors: Masahide Ohnishi, Takeshi Kamono
  • Patent number: 9544024
    Abstract: A wireless power receiving device includes a voltage detection unit that detects an output voltage value of a rectifying unit, a power reduction unit that includes a switching element connected to a charging unit in parallel, and a control unit that controls operations of the switching element. In a case where the output voltage value detected by the voltage detection unit exceeds a first reference voltage value set in advance, the control unit controls and turns the switching element on by applying a voltage to the switching element, and controls the value of the voltage to be applied to the switching element so that the difference between the voltage value calculated on the basis of a current flowing in the switching element and a second reference voltage value set in advance decreases.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: January 10, 2017
    Assignee: TDK CORPORATION
    Inventors: Kazutaka Tamaki, Masahide Ohnishi, Tadao Senriuchi
  • Publication number: 20150145346
    Abstract: The present invention provides a contactless power transmission circuit which is capable of narrowing a fluctuation extent of an output voltage output by a over receiving coil via a rectifier circuit. The contactless power transmission circuit controls a period of an alternating voltage output from a driving circuit based on a smaller one of either of a first command value and a second command value. Here, the first command value is one based on a difference between a detected value of the output voltage from the rectifier circuit and a target value. The second command value is one calculated based on a difference between a detected value of a transmission current flowing through the power transmitting coil and a target value.
    Type: Application
    Filed: November 26, 2014
    Publication date: May 28, 2015
    Inventors: Masahide OHNISHI, Takeshi KAMONO
  • Publication number: 20150001954
    Abstract: A wireless power receiving device includes a voltage detection unit that detects an output voltage value of a rectifying unit, a power reduction unit that includes a switching element connected to a charging unit in parallel, and a control unit that controls operations of the switching element. In a case where the output voltage value detected by the voltage detection unit exceeds a first reference voltage value set in advance, the control unit controls and turns the switching element on by applying a voltage to the switching element, and controls the value of the voltage to be applied to the switching element so that the difference between the voltage value calculated on the basis of a current flowing in the switching element and a second reference voltage value set in advance decreases.
    Type: Application
    Filed: June 23, 2014
    Publication date: January 1, 2015
    Inventors: Kazutaka TAMAKI, Masahide OHNISHI, Tadao SENRIUCHI
  • Publication number: 20150001956
    Abstract: To provide a wireless power receiving device, and a wireless power transmission device capable of improving the reliability of a protection circuit while preventing breakage of a circuit element upon occurrence of any abnormality, such as overvoltage or overcurrent. A wireless power receiving device includes a power receiving coil; a rectifier unit that performs full-wave rectification of the power received by the power receiving coil and supplies the power to a load; power-receiving-side detecting unit that detects an output voltage value or an output current value from the rectifier unit; and switching unit that short-circuits one of two current paths through the rectifier unit if the value detected by the power-receiving-side detecting unit exceeds a predetermined reference value.
    Type: Application
    Filed: June 26, 2014
    Publication date: January 1, 2015
    Inventors: Tsunehiro SAEN, Masahide OHNISHI, Ryo MIYAZAWA
  • Patent number: 6380536
    Abstract: The present invention aims at providing a rotation angle detector capable of detecting and storing information for a direction and an angle of rotation of steering wheel while maintaining a condition of reduced power consumption from a battery, when an engine is not running. In achieving the object, the invention discloses a structure, wherein the detector keeps a control means (8) including a memory unit (11) in a memory back-up mode when an ignition switch (7a), i.e.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: April 30, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Makoto Inoue, Susumu Nishimoto, Norimitsu Kurihara, Masahide Ohnishi, Katsuya Saitou