Patents by Inventor Yuji Nojiri
Yuji Nojiri 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: 10447172Abstract: A power regenerative converter, includes: a power module configured to include rectifiers and regenerative switches; a smoothing capacitor connected to direct-current power supply terminals, and that accumulates direct-current power during an alternating-current to direct-current conversion; a bus current detector that detects a bus current flowing between either of the direct-current power supply terminals and the smoothing capacitor; a power supply phase detector that detects a phase of an input power supply; a base drive signal generator that generates base drive signals that perform ON/OFF control of the regenerative switching elements based on a power supply phase detected by the power supply phase detection unit; a regeneration controller that performs a start and stop process of a power regenerative operation based on a detection result of the bus current detector and the base drive signals; and an overload detector that detects overload of a power regenerative converter based on the detection result oType: GrantFiled: July 21, 2016Date of Patent: October 15, 2019Assignee: Mitsubishi Electric CorporationInventors: Yoshitomo Hayashi, Yoji Tsutsumishita, Masaya Harakawa, Yuji Nojiri
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Publication number: 20180198396Abstract: A power regenerative converter, includes: a power module configured to include rectifiers and regenerative switches; a smoothing capacitor connected to direct-current power supply terminals, and that accumulates direct-current power during an alternating-current to direct-current conversion; a bus current detector that detects a bus current flowing between either of the direct-current power supply terminals and the smoothing capacitor; a power supply phase detector that detects a phase of an input power supply; a base drive signal generator that generates base drive signals that perform ON/OFF control of the regenerative switching elements based on a power supply phase detected by the power supply phase detection unit; a regeneration controller that performs a start and stop process of a power regenerative operation based on a detection result of the bus current detector and the base drive signals; and an overload detector that detects overload of a power regenerative converter based on the detection result oType: ApplicationFiled: July 21, 2016Publication date: July 12, 2018Applicant: Mitsubishi Electric CorporationInventors: Yoshitomo HAYASHI, Yoji TSUTSUMISHITA, Masaya HARAKAWA, Yuji NOJIRI
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Patent number: 9570972Abstract: A CR snubber circuit capable of increasing a reduction effect of the effective inductance component and suppressing a ringing component generated at the time of switching the switching element is obtained. A first current path formed on one surface of the substrate and a second current path formed on the other surface, which is the opposite side of the one surface of the substrate, are opposed to each other with the substrate being sandwiched therebetween, and the capacitor 5 and the resistor 6 are arranged such that current flows in opposite directions in the first current path and the second current path, and a band elimination filter is formed by the capacitor 5, the resistor 6, and an effective inductance component obtained by coupling an inductance component included in the first current path and an inductance component included in the second current path.Type: GrantFiled: October 2, 2013Date of Patent: February 14, 2017Assignee: Mitsubishi Electric CorporationInventors: Mitsuhiko Kanda, Shizuri Tamura, Akira Hatai, Yasuhiro Sekimoto, Yuji Nojiri, Yoshitomo Hayashi
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Publication number: 20160344279Abstract: A CR snubber circuit capable of increasing a reduction effect of the effective inductance component and suppressing a ringing component generated at the time of switching the switching element is obtained. A first current path formed on one surface of the substrate and a second current path formed on the other surface, which is the opposite side of the one surface of the substrate, are opposed to each other with the substrate being sandwiched therebetween, and the capacitor 5 and the resistor 6 are arranged such that current flows in opposite directions in the first current path and the second current path, and a band elimination filter is formed by the capacitor 5, the register 6, and an effective inductance component obtained by coupling an inductance component included in the first current path and an inductance component included in the second current path.Type: ApplicationFiled: October 2, 2013Publication date: November 24, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Mitsuhiko KANDA, Shizuri TAMURA, Akira HATAI, Yasuhiro SEKIMOTO, Yuji NOJIRI, Yoshitomo HAYASHI
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Patent number: 9281776Abstract: A power conversion apparatus includes a power-conversion circuit unit that includes at least two voltage-type bridge circuits of an upper and lower arm configuration including switching elements connected in series, each of the switching elements including a transistor and a free wheel diode connected to the transistor in inverse parallel. Each of the voltage-type bridge circuits is configured to include, as the free wheel diodes: a SiC-SBD (SiC-Schottky-Barrier Diodes) in both upper and lower arms; a SiC-SBD only in the upper arm; a SiC-SBD only in the lower arm; or a diode other than the SiC-SBD in both the upper and lower arms; and the power-conversion circuit unit is configured by combining at least two configurations among the four configurations for the voltage-type bridge circuits.Type: GrantFiled: January 31, 2011Date of Patent: March 8, 2016Assignee: Mitsubishi Electric CorporationInventors: Yuji Nojiri, Masanori Kato, Akira Imanaka, Masaya Harakawa
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Publication number: 20130307500Abstract: A power conversion apparatus includes a power-conversion circuit unit that includes at least two voltage-type bridge circuits of an upper and lower arm configuration including switching elements connected in series, each of the switching elements including a transistor and a free wheel diode connected to the transistor in inverse parallel. Each of the voltage-type bridge circuits is configured to include, as the free wheel diodes: a SiC-SBD (SiC-Schottky-Barrier Diodes) in both upper and lower arms; a SiC-SBD only in the upper arm; a SiC-SBD only in the lower arm; or a diode other than the SiC-SBD in both the upper and lower arms; and the power-conversion circuit unit is configured by combining at least two configurations among the four configurations for the voltage-type bridge circuits.Type: ApplicationFiled: January 31, 2011Publication date: November 21, 2013Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuji Nojiri, Masanori Kato, Akira Imanaka, Masaya Harakawa
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Patent number: 5436674Abstract: An apparatus capable of detecting with improved accuracy a motion vector representing an object moved on a picture plane comprises a memory section for storing an input picture signal renewed for every predetermined time interval, a spatial filter section for applying a spatial band limitation to two signal portions of the renewed picture signal stored in the memory, which signal portions corresponding to the different time intervals, and a detecting section including at least one detecting stage for detecting the motion vector in accordance with the gradient method on the basis of the two picture signals and a minute value to be added to a gradient determined from one reference picture signal represented by one of the two picture signals.Type: GrantFiled: December 21, 1993Date of Patent: July 25, 1995Assignee: Nippon Hoso KyokaiInventors: Hiroshi Hirabayashi, Yuji Nojiri, Yasuaki Kanatsugu, Shoichi Suzuki, Hajime Sonehara, Junji Kumada, Iwao Obata, Kenji Nakashima