Patents Assigned to National University Corporation, Nagaoka University of Technology
  • Publication number: 20200295674
    Abstract: A power conversion device which reduces switching losses and stabilizes the output power. A switching-mode changer generates a reference signal for switching a mode of operation of the full-bridge circuit to a first switching mode or a second switching mode. In the first switching mode, an upper arm and a lower arm are switched synchronously, and a lower arm and an upper arm are non-conducting. In the second switching mode, the lower arm and the upper arm are switched synchronously, and the upper arm and the lower arm are non-conducting. The switching-mode changer adjusts the phase of the reference signal so that the reactive power is reduced.
    Type: Application
    Filed: September 20, 2018
    Publication date: September 17, 2020
    Applicants: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of Technology
    Inventors: Yu KAWAI, Tatsuya OKUDA, Jun-ichi ITOH, Hoai Nam LE
  • Patent number: 10778116
    Abstract: A three-phase inverter includes three series circuits that are connected in parallel to a capacitor connected in parallel to a DC voltage source. Each of the three series circuits includes two semiconductor switching elements connected in series. A connection point between the two semiconductor switching elements is used as an AC output terminal for each phase. The three-phase inverter generates PWM pulses of three phases including a PWM pulse of one phase, whose pulse width of a positive side pulse in one switching cycle is the largest, and including PWM pulses of the other two phases such that a positional relationship between positive side pulses of the other two phases is a positional relationship in which an overlapping range on a time axis is smaller as compared with a state in which a positive side pulse of one phase encompasses a positive side pulse of the other pulse.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: September 15, 2020
    Assignees: National University Corporation Nagaoka University of Technology, FUJI ELECTRIC CO., LTD.
    Inventors: Junichi Itoh, Koroku Nishizawa, Akio Toba, Akihiro Odaka
  • Publication number: 20190252846
    Abstract: A high-voltage pulse generator may include a number “n” (n is a natural number of not less than 2) of primary electric circuits connected in parallel to one another on the primary side of a pulse transformer, and a secondary electric circuit of the pulse transformer, which is connected to a pair of discharge electrodes disposed in a laser chamber of a gas laser apparatus. The “n” primary electric circuits may include a number “n” of primary coils connected in parallel to one another, a number “n” of capacitors respectively connected in parallel to the “n” primary coils, and a number “n” of switches respectively connected in series to the “n” capacitors. The “n” primary electric circuits may be connected to a number “n” of chargers for charging the “n” capacitors, respectively.
    Type: Application
    Filed: April 26, 2019
    Publication date: August 15, 2019
    Applicants: National University Corporation Nagaoka University of Technology, Gigaphoton Inc.
    Inventors: Weihua JIANG, Hiroshi UMEDA, Hakaru MIZOGUCHI, Takashi MATSUNAGA, Hiroaki TSUSHIMA, Tomoyuki OHKUBO
  • Patent number: 10374229
    Abstract: A positive electrode active material for alkali-ion secondary batteries is provided which contains 20-55% of Na2O+Li2O, 10-60% of CrO+FeO+MnO+CoO+NiO, and 20-55% of P2O5+SiO2+B2O3 in terms of oxide-equivalent mol % and includes 50 mass % or more of an amorphous phase. According to the present invention, it is possible to provide a positive electrode active material for alkali-ion secondary batteries that enables high energy density and is excellent in the charge and discharge characteristics.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: August 6, 2019
    Assignees: NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY, NIPPON ELECTRIC GLASS CO., LTD.
    Inventors: Tsuyoshi Honma, Takayuki Komatsu, Satoshi Nakata, Hideo Yamauchi, Fumio Sato
  • Patent number: 10042343
    Abstract: This application discloses a control device for controlling a motor configured to drive an oscillatory cyclo-speed reducer including an oscillatory gear portion formed with at least one hole at an eccentric position. The control device includes an angle acquirer for acquiring input information about an input rotational angle indicating a rotational angle of the motor, an estimator for estimating an angular error between the input rotational angle and an output rotational angle indicating a rotational angle of the oscillatory cyclo-speed reducer based on a quantity of the hole(s) and a corrector for determining a compensation current value in correspondence to the angular error and setting a magnitude of a current to be supplied to the motor by correcting a command current value using the compensation current value.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: August 7, 2018
    Assignees: NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY, NABTESCO CORPORATION
    Inventors: Kiyoshi Ohishi, Yuki Yokokura, Yosei Hirano, Koji Nakamura, Masataka Sato
  • Patent number: 9979325
    Abstract: A power-generating system includes a heat source which is able to produce temporal temperature variation; a first device which is able to produce temporal temperature variation based on the temperature change of the heat source and in which polarization occurs; a second device for taking out a net generating power from the first device; a temperature sensor that detects the temperature of the first device; a voltage application device that applies a voltage to the first device; and a control unit for activating the voltage application device on detecting an increase in temperature of the first device and for stopping the voltage application device on detecting a decrease in temperature of the first device by the temperature sensor.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: May 22, 2018
    Assignees: DAIHATSU MOTOR CO., LTD., National University Corporation Nagaoka University of Technology
    Inventors: Yoonho Kim, Satoru Yamanaka, Juyoung Kim, Hirohisa Tanaka, Tadachika Nakayama, Masatoshi Takeda, Noboru Yamada, Koichi Niihara
  • Publication number: 20170338618
    Abstract: A high-voltage pulse generator may include a number “n” (n is a natural number of not less than 2) of primary electric circuits connected in parallel to one another on the primary side of a pulse transformer, and a secondary electric circuit of the pulse transformer, which is connected to a pair of discharge electrodes disposed in a laser chamber of a gas laser apparatus. The “n” primary electric circuits may include a number “n” of primary coils connected in parallel to one another, a number “n” of capacitors respectively connected in parallel to the “n” primary coils, and a number “n” of switches respectively connected in series to the “n” capacitors. The “n” primary electric circuits may be connected to a number “n” of chargers for charging the “n” capacitors, respectively.
    Type: Application
    Filed: August 8, 2017
    Publication date: November 23, 2017
    Applicants: National University Corporation Nagaoka University of Technology, Gigaphoton Inc.
    Inventors: Weihua JIANG, Hiroshi UMEDA, Hakaru MIZOGUCHI, Takashi MATSUNAGA, Hiroaki TSUSHIMA, Tomoyuki OHKUBO
  • Patent number: 9780283
    Abstract: A thermoelectric conversion element that can efficiently make a temperature difference across a thermoelectric conversion material is provided. In the thermoelectric conversion element, on a first surface of a thermoelectric conversion module comprising a P-type thermoelectric element, an N-type thermoelectric element, and an electrode, a thermally conductive resin layer A and a thermally conductive resin layer B having a lower thermal conductivity than the thermally conductive resin layer A are provided in an alternating manner so as to be in direct contact with the first surface, and on a second surface on the opposite side of the first surface of the thermoelectric conversion module, a thermally conductive resin layer a and a thermally conductive resin layer b having a lower thermal conductivity than the thermally conductive resin layer a are provided in an alternating manner so as to be in direct contact with the second surface.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: October 3, 2017
    Assignees: NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY, LINTEC CORPORATION
    Inventors: Masatoshi Takeda, Tsuyoshi Mutou, Takeshi Kondo
  • Publication number: 20160284964
    Abstract: A power generation system includes: a heat source having a temperature being changed over time; a flow passage through which a heat medium heated by the heat source passes; a power generation device including a power generation element and a first electrode, the power generation element being electrically polarized by temperature change thereof depending on temperature change of the heat medium, the first electrode extracting electric power from the power generation element; a temperature detection device being disposed on an upstream side relative to the power generation device in the flow passage and detecting the temperature of the heat medium; a voltage application device that applies voltage to the power generation element; and a control device that activates the voltage application device when the temperature increase of the heat medium has been detected and deactivates the voltage application unit when the temperature decrease of the heat medium has been detected.
    Type: Application
    Filed: November 20, 2014
    Publication date: September 29, 2016
    Applicants: DAIHATSU MOTOR CO., LTD., NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY
    Inventors: Satoru YAMANAKA, Yoonho KIM, Takashi OGAWA, Akira NAKAJIMA, Juyoung KIM, Hirohisa TANAKA, Tadachika NAKAYAMA, Masatoshi TAKEDA, Noboru YAMADA, Koichi NIIHARA
  • Publication number: 20160284963
    Abstract: A thermoelectric conversion element that can efficiently make a temperature difference across a thermoelectric conversion material is provided. In the thermoelectric conversion element, on a first surface of a thermoelectric conversion module comprising a P-type thermoelectric element, an N-type thermoelectric element, and an electrode, a thermally conductive resin layer A and a thermally conductive resin layer B having a lower thermal conductivity than the thermally conductive resin layer A are provided in an alternating manner so as to be in direct contact with the first surface, and on a second surface on the opposite side of the first surface of the thermoelectric conversion module, a thermally conductive resin layer a and a thermally conductive resin layer b having a lower thermal conductivity than the thermally conductive resin layer a are provided in an alternating manner so as to be in direct contact with the second surface.
    Type: Application
    Filed: March 18, 2014
    Publication date: September 29, 2016
    Applicants: NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY, LINTEC CORPORATION
    Inventors: Masatoshi TAKEDA, Tsuyoshi MUTOU, Takeshi KONDO
  • Publication number: 20160225973
    Abstract: Provided are a power generation element including a power generation material indicated by the following general formula (1), and a power generation system using the power generation element: (AxB1-x)NbO3 (1), where A and B are mutually different and represent at least one element selected from rare-earth elements, alkaline-earth metals, alkaline metals, Cd, and Bi, and x represents an atomic proportion in a numerical range of 0<x?1. The configuration provides a power generation material that enables sufficient power generation performance even in a high temperature range, a power generation element including the power generation material, and a power generation system using the power generation element.
    Type: Application
    Filed: September 9, 2014
    Publication date: August 4, 2016
    Applicants: DAIHATSU MOTOR CO., LTD., NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY
    Inventors: Juyoung KIM, Yoonho KIM, Takashi Ogawa, Satoru YAMANAKA, Akira NAKAJIMA, Hirohisa TANAKA, Tadachika NAKAYAMA, Masatoshi TAKEDA, Noboru YAMADA, Koichi NIIHARA
  • Patent number: 9369056
    Abstract: A power converter is provided for direct conversion of multi-phase AC power to AC power. The power converter includes a conversion circuit and a plurality of output lines. The conversion circuit has first and second switching elements that are configured to be connected to phases of the multi-phase AC power for bidirectional switching of energizing current. The output lines are connected to the conversion circuit. The first and second switching elements have output terminals. The output terminals of the first and second switching elements are arranged in first and second rows. The output terminals of the first and second switching elements face each other. The first output lines include two first output lines including first and second widely shaped bus bars connected to the output terminals of the first and second switching elements, respectively. The first output lines extending out in one direction, and line up in an upright direction.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: June 14, 2016
    Assignees: Nissan Motor Co., Ltd., NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY
    Inventors: Hironori Koyano, Takamasa Nakamura, Kouji Yamamoto, Junichi Itoh, Yoshiya Ohnuma
  • Patent number: 9369055
    Abstract: A power converter is provided for direct conversion of multi-phase AC power to AC power. The power converter includes a conversion circuit, a plurality of input lines and a plurality of capacitors. The conversion circuit has first and second switching elements that are configured to be connected to the phases of the multi-phase AC power for bidirectional switching of energizing current. The input lines are connected to the conversion circuit. The capacitors are connected to the conversion circuit. The first and second switching elements are arranged such that paired input terminals line up in a row with the paired input terminals to an outside, and paired output terminals to an inside. The input lines extend in a direction in which the paired input terminals line up, and extend from one of the input terminals to another of the input terminals.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: June 14, 2016
    Assignees: Nissan Motor Co., Ltd., NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY
    Inventors: Hironori Koyano, Takamasa Nakamura, Kouji Yamamoto, Junichi Itoh, Yoshiya Ohnuma
  • Patent number: 9156961
    Abstract: Provided are a vulcanizate of a chloroprene rubber composition containing carbon black that generates a smaller amount of heat when used and a method for producing the same by a simpler and more convenient method. First, an unvulcanized rubber composition at least containing a chloroprene polymer and carbon black is vulcanization-molded, to give a semivulcanized molded article having a cure characteristic value, as determined by the method specified in JIS K6300-2: 2001, in the range of t10 to t80. Then, the semivulcanized molded article obtained by semivulcanized film-forming step is additionally vulcanized in the state as it is deformed entirely and the deformation is removed, to give vulcanizate in a desired shape.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: October 13, 2015
    Assignees: DENKI KAGAKU KOGYO KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY
    Inventors: Yoshinobu Isono, Naoki Kobayashi, Yasushi Abe
  • Publication number: 20150256108
    Abstract: A power-generating system includes a heat source which is able to produce temporal temperature variation; a first device which is able to produce temporal temperature variation based on the temperature change of the heat source and in which polarization occurs; a second device for taking out a net generating power from the first device; a temperature sensor that detects the temperature of the first device; a voltage application device that applies a voltage to the first device; and a control unit for activating the voltage application device on detecting an increase in temperature of the first device and for stopping the voltage application device on detecting a decrease in temperature of the first device by the temperature sensor.
    Type: Application
    Filed: June 28, 2013
    Publication date: September 10, 2015
    Applicants: DAIHATSU MOTOR CO., LTD., National University Corporation Nagaoka University of Technology
    Inventors: Yoonho Kim, Satoru Yamanaka, Juyoung Kim, Hirohisa Takaka, Tadachika Nakayama, Masatoshi Takada, Noboru Yamada, Koichi Niihara
  • Publication number: 20150073086
    Abstract: Provided are a vulcanizate of a chloroprene rubber composition containing carbon black that generates a smaller amount of heat when used and a method for producing the same by a simpler and more convenient method. First, an unvulcanized rubber composition at least containing a chloroprene polymer and carbon black is vulcanization-molded, to give a semivulcanized molded article having a cure characteristic value, as determined by the method specified in JIS K6300-2: 2001, in the range of t10 to t80. Then, the semivulcanized molded article obtained by semivulcanized film-forming step is additionally vulcanized in the state as it is deformed entirely and the deformation is removed, to give vulcanizate in a desired shape.
    Type: Application
    Filed: November 27, 2012
    Publication date: March 12, 2015
    Applicants: DENKI KAGAKU KOGYO KABUSHIKI KAISHA, National University Corporation Nagaoka University of Technology
    Inventors: Yoshinobu Isono, Naoki Kobayashi, Yasushi Abe
  • Publication number: 20150001989
    Abstract: A power-generating system includes a heat source which is able to produce temporal temperature variation; a first device which is able to produce temporal temperature variation based on the temperature change of the heat source and in which polarization occurs; a second device for taking out a net generating power from the first device; a detection unit that detects the temperature of the first device; an electric field application unit that applies an electric field to the first device; and a control unit for activating the electric field application unit when the temperature detected by the detection unit is the Curie temperature of the first device or higher.
    Type: Application
    Filed: August 28, 2012
    Publication date: January 1, 2015
    Applicants: Daihatsu Motor Co., Ltd., National University Corporation Nagaoka University of Technology
    Inventors: Yoonho Kim, Juyoung Kim, Takeshi Serizawa, Hirohisa Tanaga, Tadachika Nakayama, Masatoshi Takeda, Noboru Yamada, Koichi Niihara, Kyohei Ogawa, Satoshi Ishizawa, Masashi Shida
  • Publication number: 20140268970
    Abstract: A matrix converter according to an embodiment includes a power converter having a plurality of bidirectional switches, a controller, and a current detector. The controller controls the power converter. The correct detector detects a current flowing to an output side of the power converter. The controller extracts a high-frequency component contained in the current detected by the current detector, adjusts an output current reference on the basis of the high-frequency component, and controls the power converter on the basis of the adjusted output current reference.
    Type: Application
    Filed: May 28, 2014
    Publication date: September 18, 2014
    Applicants: KABUSHIKI KAISHA YASKAWA DENKI, National University Corporation Nagaoka University of Technology
    Inventors: Takashi TANAKA, Eiji YAMAMOTO, Jun-ichi ITOH, Hiroki TAKAHASHI
  • Publication number: 20140247635
    Abstract: A power converter is provided for direct conversion of multi-phase AC power to AC power. The power converter includes a conversion circuit, a plurality of input lines and a plurality of capacitors. The conversion circuit has first and second switching elements that are configured to be connected to the phases of the multi-phase AC power for bidirectional switching of energizing current. The input lines are connected to the conversion circuit. The capacitors are connected to the conversion circuit. The first and second switching elements are arranged such that paired input terminals line up in a row with the paired input terminals to an outside, and paired output terminals to an inside. The input lines extend in a direction in which the paired input terminals line up, and extend from one of the input terminals to another of the input terminals.
    Type: Application
    Filed: September 28, 2012
    Publication date: September 4, 2014
    Applicant: National University Corporation Nagaoka University of Technology
    Inventors: Hironori Koyano, Takamasa Nakamura, Kouji Yamamoto, Junichi Itoh, Yoshiya Ohnuma
  • Publication number: 20140225474
    Abstract: A power-generating system includes a heat source which is able to produce temporal temperature variation, a first device in which polarization occurs based on the temperature change of the heat source, and a second device for taking out a net generating power from the first device, wherein 80% or higher of the total surface area of the first device is heated and/or cooled with the heat source.
    Type: Application
    Filed: August 28, 2012
    Publication date: August 14, 2014
    Applicants: DAIHATSU MOTOR CO., LTD., NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGY
    Inventors: Yoonho Kim, Juyoung Kim, Satoru Yamanaka, Takeshi Serizawa, Hirohisa Tanaka, Tadachika Nakayama, Masatoshi Takeda, Noboru Yamada, Koichi Niihara