Patents by Inventor Masayuki TOBIKAWA
Masayuki TOBIKAWA 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).
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Patent number: 9984806Abstract: Provided is a coil mounting structure for a device that comprises a primary coil to be supplied with an alternating current, and a secondary coil arranged facing the primary coil and configured to supply an electric power to a load provided in a housing by using an induced voltage generated by an electromagnetic field produced by the primary coil. The coil mounting structure comprises at least one mounting part provided in a region of the housing, the region facing the primary coil, and the at least one mounting part is configured to hold the secondary coil to the housing. The at least one mounting part comprises at least one gap area configured to interrupt a circuit generated by the at least one mounting part.Type: GrantFiled: March 11, 2015Date of Patent: May 29, 2018Assignee: CENTRAL JAPAN RAILWAY COMPANYInventors: Daisuke Shimode, Toshiaki Murai, Yoshiyasu Hagiwara, Masayuki Tobikawa, Yukio Takahashi
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Patent number: 9632564Abstract: In a power supply device, the bridge circuit is configured by connecting, in parallel, a plurality of series circuits of an inverse-parallel connection circuit of a semiconductor switch and a diode. A control unit controls switching of a semiconductor switch so that a voltage v between AC terminals becomes zero voltage in equal periods ? before and after a center point shifted from one zero crossing point in one cycle of the input current by a compensation period (angle) ? calculated from a voltage applied to a resonance circuit constituted by the power receiving coil and a resonance capacitor Cr and an induced voltage of the power receiving coil, and becomes a positive-negative voltage whose peak value is the voltage Vo between DC terminals in other periods.Type: GrantFiled: June 10, 2014Date of Patent: April 25, 2017Assignees: CENTRAL JAPAN RAILWAY COMPANY, FUJI ELECTRIC CO., LTD.Inventors: Toshiaki Murai, Yoshiyasu Hagiwara, Tadashi Sawada, Masayuki Tobikawa, Ayako Saga, Michio Tamate, Koji Maruyama, Tomotaka Nishijima
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Patent number: 9231494Abstract: In a power supply device, the bridge circuit including a plurality of switching arms which is an inverse-parallel circuit of a semiconductor switch and a diode. The power supply device includes a control unit. The control unit switches the semiconductor switch such that a voltage v between AC terminals becomes a positive-negative voltage whose peak value is the voltage Vo between the DC terminals only during prescribed time periods before and after a point that has deviated from each zero crossing point ZCP of a current i by a prescribed compensation period ? and such that the voltage v between the AC terminals becomes a zero voltage during the other time periods, and sets the compensation period ? such that a time period during which the voltage v between the AC terminals becomes a zero voltage is the shortest.Type: GrantFiled: July 2, 2014Date of Patent: January 5, 2016Assignees: CENTRAL JAPAN RAILWAY COMPANY, FUJI ELECTRIC CO., LTD.Inventors: Tadashi Sawada, Toshiaki Murai, Yoshiyasu Hagiwara, Masayuki Tobikawa, Ayako Saga, Tomotaka Nishijima, Toshiya Kaneko
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Publication number: 20150279543Abstract: Provided is a coil mounting structure for a device that comprises a primary coil to be supplied with an alternating current, and a secondary coil arranged facing the primary coil and configured to supply an electric power to a load provided in a housing by using an induced voltage generated by an electromagnetic field produced by the primary coil. The coil mounting structure comprises at least one mounting part provided in a region of the housing, the region facing the primary coil, and the at least one mounting part is configured to hold the secondary coil to the housing. The at least one mounting part comprises at least one gap area configured to interrupt a circuit generated by the at least one mounting part.Type: ApplicationFiled: March 11, 2015Publication date: October 1, 2015Applicant: CENTRAL JAPAN RAILWAY COMPANYInventors: Daisuke SHIMODE, Toshiaki MURAl, Yoshiyasu HAGIWARA, Masayuki TOBIKAWA, Yukio TAKAHASHI
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Publication number: 20150023079Abstract: In a power supply device, the bridge circuit including a plurality of switching arms which is an inverse-parallel circuit of a semiconductor switch and a diode. The power supply device includes a control unit. The control unit switches the semiconductor switch such that a voltage v between AC terminals becomes a positive-negative voltage whose peak value is the voltage Vo between the DC terminals only during prescribed time periods before and after a point that has deviated from each zero crossing point ZCP of a current i by a prescribed compensation period ? and such that the voltage v between the AC terminals becomes a zero voltage during the other time periods, and sets the compensation period ? such that a time period during which the voltage v between the AC terminals becomes a zero voltage is the shortest.Type: ApplicationFiled: July 2, 2014Publication date: January 22, 2015Applicants: CENTRAL JAPAN RAILWAY COMPANY, FUJI ELECTRIC CO., LTD.Inventors: Tadashi SAWADA, Toshiaki MURAI, Yoshiyasu HAGIWARA, Masayuki TOBIKAWA, Ayako SAGA, Tomotaka NISHIJIMA, Toshiya KANEKO
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Publication number: 20140372780Abstract: In a power supply device, the bridge circuit is configured by connecting, in parallel, a plurality of series circuits of an inverse-parallel connection circuit of a semiconductor switch and a diode. A control unit controls switching of a semiconductor switch so that a voltage v between AC terminals becomes zero voltage in equal periods ? before and after a center point shifted from one zero crossing point in one cycle of the input current by a compensation period (angle) ? calculated from a voltage applied to a resonance circuit constituted by the power receiving coil and a resonance capacitor Cr and an induced voltage of the power receiving coil, and becomes a positive-negative voltage whose peak value is the voltage Vo between DC terminals in other periods.Type: ApplicationFiled: June 10, 2014Publication date: December 18, 2014Applicants: CENTRAL JAPAN RAILWAY COMPANY, FUJI ELECTRIC CO., LTD.Inventors: Toshiaki MURAI, Yoshiyasu HAGIWARA, Tadashi SAWADA, Masayuki TOBIKAWA, Ayako SAGA, Michio TAMATE, Koji MARUYAMA, Tomotaka NISHIJIMA