Patents by Inventor Kazutoshi Kurahashi
Kazutoshi Kurahashi 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: 11349410Abstract: A series multiplex inverter includes a power conversion unit, a phase difference selection unit, a drive signal generation unit, and a drive signal output unit. The phase difference selection unit selects, from among a plurality of phase difference candidates, the phase difference between rectangular wave voltages from a plurality of single-phase inverters. The drive signal generation unit generates a plurality of drive signals that causes the different single-phase inverters to output a plurality of rectangular wave voltages sequentially out of phase by the phase difference selected by the phase difference selection unit. The drive signal output unit outputs the plurality of drive signals generated by the drive signal generation unit to the plurality of single-phase inverters.Type: GrantFiled: January 30, 2018Date of Patent: May 31, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kazufumi Tanaka, Kazutoshi Kurahashi, Yoshiaki Yamamoto, Shuta Ishikawa
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Patent number: 11183948Abstract: A series multiplex inverter includes a power conversion unit, a drive signal generation unit, and a drive signal output unit. The drive signal generation unit generates n drive signals that cause different single-phase inverters of n single-phase inverters to output n rectangular wave voltages sequentially out of phase, where n is an integer of three or more. The drive signal output unit outputs the n drive signals to the n single-phase inverters in rotation that shifts, by p every m-fold time of half an output voltage period of the power conversion unit, the single-phase inverters corresponding one-to-one to the n drive signals in a combination of the n drive signals with different single-phase inverters of the n single-phase inverters, where m is a natural number and p is a natural number relatively prime to n or one.Type: GrantFiled: January 29, 2018Date of Patent: November 23, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kazufumi Tanaka, Kazutoshi Kurahashi, Yoshiaki Yamamoto, Shuta Ishikawa
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Publication number: 20210075338Abstract: A series multiplex inverter includes a power conversion unit, a phase difference selection unit, a drive signal generation unit, and a drive signal output unit. The phase difference selection unit selects, from among a plurality of phase difference candidates, the phase difference between rectangular wave voltages from a plurality of single-phase inverters. The drive signal generation unit generates a plurality of drive signals that causes the different single-phase inverters to output a plurality of rectangular wave voltages sequentially out of phase by the phase difference selected by the phase difference selection unit. The drive signal output unit outputs the plurality of drive signals generated by the drive signal generation unit to the plurality of single-phase inverters.Type: ApplicationFiled: January 30, 2018Publication date: March 11, 2021Applicant: Mitsubishi Electric CorporationInventors: Kazufumi TANAKA, Kazutoshi KURAHASHI, Yoshiaki YAMAMOTO, Shuta ISHIKAWA
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Publication number: 20210067054Abstract: A series multiplex inverter includes a power conversion unit, a drive signal generation unit, and a drive signal output unit. The drive signal generation unit generates n drive signals that cause different single-phase inverters of n single-phase inverters to output n rectangular wave voltages sequentially out of phase, where n is an integer of three or more. The drive signal output unit outputs the n drive signals to the n single-phase inverters in rotation that shifts, by p every m-fold time of half an output voltage period of the power conversion unit, the single-phase inverters corresponding one-to-one to the n drive signals in a combination of the n drive signals with different single-phase inverters of the n single-phase inverters, where m is a natural number and p is a natural number relatively prime to n or one.Type: ApplicationFiled: January 29, 2018Publication date: March 4, 2021Applicant: Mitsubishi Electric CorporationInventors: Kazufumi TANAKA, Kazutoshi KURAHASHI, Yoshiaki YAMAMOTO, Shuta ISHIKAWA
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Publication number: 20160027568Abstract: This invention is provided with: a wind tunnel that, while keeping an insulating distance to pair-forming coils, surrounds a region from a yoke portion of a core to at least a part of the pair-forming coils, to thereby guide a flow of cooling air for the pair-forming coils into an extending direction of leg portions; a supporting structural member that is fixed to the yoke portion to support inside the wind tunnel, the core and the pair-forming coils; and a windshield plate that partly shields a gap between the pair-forming coils and the wind tunnel; wherein, in the supporting structural member, air holes for passing the cooling air therethrough are formed in corresponding to inner gaps of the coils.Type: ApplicationFiled: July 18, 2013Publication date: January 28, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Daisuke TAKAUCHI, Hajime NAKATANI, Kazutoshi KURAHASHI
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Patent number: 8896316Abstract: In a device having capacitive loads in which a plurality of capacitive loads are connected in parallel, power is supplied from an AC power source to a load group comprising the plurality of capacitive loads, the load group is divided into a plurality of small load groups, and a current detecting sensor for detecting a current which flows in at least one small load group at a side which is closer to the load side than a branch point at which the load group is divided into the plurality of small load groups and a current abnormality detecting part for determining an abnormality of a load by a current detecting signal which is detected by the current detecting sensor are equipped.Type: GrantFiled: June 17, 2010Date of Patent: November 25, 2014Assignee: Mitsubshi Electric CorporationInventors: Kazutoshi Kurahashi, Takashi Kumagai, Taichiro Tamida, Hajime Nakatani, Daisuke Takauchi
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Publication number: 20120319696Abstract: In a device having capacitive loads in which a plurality of capacitive loads are connected in parallel, power is supplied from an AC power source to a load group comprising the plurality of capacitive loads, the load group is divided into a plurality of small load groups, and a current detecting sensor for detecting a current which flows in at least one small load group at a side which is closer to the load side than a branch point at which the load group is divided into the plurality of small load groups and a current abnormality detecting part for determining an abnormality of a load by a current detecting signal which is detected by the current detecting sensor are equipped.Type: ApplicationFiled: June 17, 2010Publication date: December 20, 2012Applicant: Mitsubishi Electric CorporationInventors: Kazutoshi Kurahashi, Takashi Kumagai, Taichiro Tamida, Hajime Nakatani, Daisuke Takauchi