Patents by Inventor Kenya Murakami
Kenya Murakami 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: 9810463Abstract: An integrated air conditioning system includes an indirect outdoor air cooler having a first heat exchanger for passing through indoor air as warm air, a second heat exchanger for passing through outdoor air, and piping and a pump for circulating a fluid through the first heat exchanger and the second heat exchanger; an air conditioner having an evaporator, a compressor, and a condenser, for passing the indoor air to convert to cold air; a fan for passing the outdoor air through the second heat exchanger and the condenser; and a control device. The control device sets any mode from among a first mode for performing an individual operation of the indirect outdoor air cooler, a second mode for performing an individual operation of the air conditioner, or a third mode for performing a combined operation of the air conditioner and the indirect outdoor air cooler, to a current operation mode.Type: GrantFiled: February 21, 2013Date of Patent: November 7, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Masaki Takahashi, Taiji Mori, Shunsuke Ohga, Shuhei Shibata, Yuichiro Minegishi
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Patent number: 9768616Abstract: A resonance suppression device configured to supply compensation current to a power system from a power conversion device connected to the power system, to suppress resonance which occurs with a power facility being connected to the power system, the resonance suppression device includes: a transfer function that is to be multiplied to a value based on voltage of the power system; a filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to output the resultant; and a coefficient control unit configured to control a coefficient of the transfer function so that a value of the compensation current falls within a predetermined range, according to output capacity of the power conversion device, wherein including a current command value generation unit being configured to generate as a current command value with respect to the power conversion device an output value obtained by inputting in the filter a valType: GrantFiled: March 2, 2017Date of Patent: September 19, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Publication number: 20170179718Abstract: A resonance suppression device configured to supply compensation current to a power system from a power conversion device connected to the power system, to suppress resonance which occurs with a power facility being connected to the power system, the resonance suppression device includes: a transfer function that is to be multiplied to a value based on voltage of the power system; a filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to output the resultant; and a coefficient control unit configured to control a coefficient of the transfer function so that a value of the compensation current falls within a predetermined range, according to output capacity of the power conversion device, wherein including a current command value generation unit being configured to generate as a current command value with respect to the power conversion device an output value obtained by inputting in the filter a valType: ApplicationFiled: March 2, 2017Publication date: June 22, 2017Applicant: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Patent number: 9621023Abstract: The present invention whose object is to reduce compensation current at the time when suppressing harmonic distortion caused by harmonic voltage, to reduce capacitance of an inverter, a resonance suppression device configured to suppress resonance which occurs when a power facility such as a wind power generator is connected to a power system includes: an inverter configured to supply alternating current to the power system, the inverter being in parallel with the power facility; a current command value generation unit in which voltage at a connection point between the power facility and the power system is inputted thereto and a current command value is obtained by multiplying, by a transfer function, a harmonic component contained in the voltage at the connection point; and a current control unit configured to control the alternating current outputted from the inverter based on the current command value.Type: GrantFiled: April 21, 2014Date of Patent: April 11, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Patent number: 9590485Abstract: A resonance suppression device, in which power loss and apparatus capacitance are reduced by outputting a compensating current only while a voltage resonance is being generated, and which suppresses resonance generated by connection of a power apparatus to a power system. In one embodiment, the device includes a capacitance change detector that detects a change of an electrostatic capacitance (impedance) connected to the power system. When the resonance detector detects the resonance, a current command value generator generates the current command value on the basis of harmonic components included in a current supplied from the power apparatus to the power system. When the impedance change detector detects a change of the impedance, the current command value generator generates the current command value so as to reduce the compensating current.Type: GrantFiled: September 10, 2015Date of Patent: March 7, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Toru Jintsugawa, Kenya Murakami
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Publication number: 20160028301Abstract: The present invention whose object is to reduce compensation current at the time when suppressing harmonic distortion caused by harmonic voltage, to reduce capacitance of an inverter, a resonance suppression device configured to suppress resonance which occurs when a power facility such as a wind power generator is connected to a power system includes: an inverter configured to supply alternating current to the power system, the inverter being in parallel with the power facility; a current command value generation unit in which voltage at a connection point between the power facility and the power system is inputted thereto and a current command value is obtained by multiplying, by a transfer function, a harmonic component contained in the voltage at the connection point; and a current control unit configured to control the alternating current outputted from the inverter based on the current command value.Type: ApplicationFiled: April 21, 2014Publication date: January 28, 2016Applicant: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Publication number: 20150381027Abstract: A resonance suppression device, in which power loss and apparatus capacitance are reduced by outputting a compensating current only while a voltage resonance is being generated, and which suppresses resonance generated by connection of a power apparatus to a power system. In one embodiment, the device includes a capacitance change detector that detects a change of an electrostatic capacitance (impedance) connected to the power system. When the resonance detector detects the resonance, a current command value generator generates the current command value on the basis of harmonic components included in a current supplied from the power apparatus to the power system. When the impedance change detector detects a change of the impedance, the current command value generator generates the current command value so as to reduce the compensating current.Type: ApplicationFiled: September 10, 2015Publication date: December 31, 2015Applicant: FUJI ELECTRIC CO., LTD.Inventors: Toru JINTSUGAWA, Kenya MURAKAMI
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Publication number: 20150000317Abstract: An integrated air conditioning system includes an indirect outdoor air cooler having a first heat exchanger for passing through indoor air as warm air, a second heat exchanger for passing through outdoor air, and piping and a pump for circulating a fluid through the first heat exchanger and the second heat exchanger; an air conditioner having an evaporator, a compressor, and a condenser, for passing the indoor air to convert to cold air; a fan for passing the outdoor air through the second heat exchanger and the condenser; and a control device. The control device sets any mode from among a first mode for performing an individual operation of the indirect outdoor air cooler, a second mode for performing an individual operation of the air conditioner, or a third mode for performing a combined operation of the air conditioner and the indirect outdoor air cooler, to a current operation mode.Type: ApplicationFiled: February 21, 2013Publication date: January 1, 2015Inventors: Kenya Murakami, Masaki Takahashi, Taiji Mori, Shunsuke Ohga, Shuhei Shibata, Yuichiro Minegishi
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Patent number: 4349699Abstract: This PARCOR-type speech synthesizer replaces a ten-stage lattice type filter with a pipeline multiplier and feedback loop, and provides a loss circuit (for bandwidth broadening) using subtraction circuits for multiplication.Type: GrantFiled: September 30, 1980Date of Patent: September 14, 1982Assignees: Nippon Telegraph & Telephone Public Corporation, Hitachi, Ltd.Inventors: Akihiro Asada, Kazuo Nakata, Kazuhiro Umemura, Hirokazu Sato, Kenya Murakami, Kiyoshi Into