Patents by Inventor Shuji Ishikura
Shuji Ishikura 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: 11296513Abstract: A station building power supply includes: a power converter that converts DC power to AC power; a casing that houses the power converter; an AC system circuit that supplies the AC power output from the power converter to electrical apparatus outside the casing; and a filter circuit that applies a high-frequency current generated in the power converter from the AC system circuit to the casing. In the station building power supply, the power converter and the casing are grounded.Type: GrantFiled: July 21, 2017Date of Patent: April 5, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Toshiaki Takeoka, Shinichi Matsumoto, Shuji Ishikura
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Publication number: 20210091570Abstract: A station building power supply includes: a power converter that converts DC power to AC power; a casing that houses the power converter; an AC system circuit that supplies the AC power output from the power converter to electrical apparatus outside the casing; and a filter circuit that applies a high-frequency current generated in the power converter from the AC system circuit to the casing. In the station building power supply, the power converter and the casing are grounded.Type: ApplicationFiled: July 21, 2017Publication date: March 25, 2021Applicant: Mitsubishi Electric CorporationInventors: Toshiaki TAKEOKA, Shinichi MATSUMOTO, Shuji ISHIKURA
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Patent number: 10730405Abstract: A station building auxiliary power unit includes a start-of-operation determination unit that determines, based on a first signal that represents information on a power flow direction indicating a direction of flow of electrical power between an AC distribution line electrically connecting to an electric vehicle and a substation for supplying AC power to the AC distribution line, whether first AC power on an AC distribution line side is to be transformed into second AC power usable by a load, and if it is determined that transformation is to be performed, generates and outputs a second signal, a voltage instruction value calculator that calculates and outputs a voltage instruction value corresponding to the second signal, and a PWM signal generator that generates a control signal for a power converter circuit operated upon transformation of the first AC power into the second AC power, and outputs the control signal.Type: GrantFiled: August 27, 2015Date of Patent: August 4, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Toshiaki Takeoka, Shinichi Matsumoto, Shuji Ishikura
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Patent number: 10372101Abstract: The present invention relates to a station auxiliary power source apparatus that converts power supplied from an overhead cable to generate power to be supplied to a load in a station. The station auxiliary power source apparatus includes a first average calculation unit that calculates the average value of the overhead cable voltage for every predetermined time period; a second average calculation unit that calculates, two or more times, an average value of the overhead cable voltage that is larger than a first average value of the average value among the overhead cable voltages; a third average calculation unit that calculates an average value of the overhead cable voltage per day; and a comparator that selects any one of a second average value of the average value and a third average value of the average value and sets the selected value as the threshold value.Type: GrantFiled: August 8, 2013Date of Patent: August 6, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Mitsushi Tominaga, Shinichi Matsumoto, Shuji Ishikura
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Publication number: 20180236899Abstract: A station building auxiliary power unit includes a start-of-operation determination unit that determines, based on a first signal that represents information on a power flow direction indicating a direction of flow of electrical power between an AC distribution line electrically connecting to an electric vehicle and a substation for supplying AC power to the AC distribution line, whether first AC power on an AC distribution line side is to be transformed into second AC power usable by a load, and if it is determined that transformation is to be performed, generates and outputs a second signal, a voltage instruction value calculator that calculates and outputs a voltage instruction value corresponding to the second signal, and a PWM signal generator that generates a control signal for a power converter circuit operated upon transformation of the first AC power into the second AC power, and outputs the control signal.Type: ApplicationFiled: August 27, 2015Publication date: August 23, 2018Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Toshiaki TAKEOKA, Shinichi MATSUMOTO, Shuji ISHIKURA
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Patent number: 10020653Abstract: The station-building power supply device includes a capacitor unit that stores therein surplus regenerative power, a first power conversion unit that performs DC/DC power conversion, and a second power conversion unit that converts DC power. A first voltage threshold for detecting the occurrence of surplus regenerative power is set and a first SOC threshold for detecting whether the capacitor unit can discharge is set. The first power conversion unit is controlled such that power is supplied from the feeder to the capacitor unit to charge the capacitor unit when the feeding voltage exceeds the first voltage threshold, and the second power conversion unit is controlled such that power is supplied from the capacitor unit to the station loads when the SOC of the capacitor unit exceeds the first SOC threshold.Type: GrantFiled: November 28, 2013Date of Patent: July 10, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yasushi Matsumura, Takeshi Tanaka, Wataru Okuda, Shuji Ishikura
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Patent number: 9898027Abstract: A station building power supply device according to the present invention includes: a station building power generation unit including an inverter main circuit and an inverter control circuit to control the inverter main circuit, in which the inverter main circuit converts a voltage supplied from an overhead wire into a voltage required by loads in a station building; a control-circuit power generation unit that converts a voltage supplied to the loads in the station building and generates an input voltage for the inverter control circuit; and a start-up power generation unit that converts a voltage supplied from the overhead wire and generates an input voltage for the inverter control circuit, in a state where the inverter main circuit has stopped the operation and the control-circuit power generation unit has stopped an operation of generating the input voltage for the inverter control circuit.Type: GrantFiled: September 5, 2012Date of Patent: February 20, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takeshi Tanaka, Yasushi Matsumura, Wataru Okuda, Shuji Ishikura
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Publication number: 20160268803Abstract: The station-building power supply device includes a capacitor unit that stores therein surplus regenerative power, a first power conversion unit that performs DC/DC power conversion, and a second power conversion unit that converts DC power. A first voltage threshold for detecting the occurrence of surplus regenerative power is set and a first SOC threshold for detecting whether the capacitor unit can discharge is set. The first power conversion unit is controlled such that power is supplied from the feeder to the capacitor unit to charge the capacitor unit when the feeding voltage exceeds the first voltage threshold, and the second power conversion unit is controlled such that power is supplied from the capacitor unit to the station loads when the SOC of the capacitor unit exceeds the first SOC threshold.Type: ApplicationFiled: November 28, 2013Publication date: September 15, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yasushi MATSUMURA, Takeshi TANAKA, Wataru OKUDA, Shuji ISHIKURA
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Publication number: 20160161935Abstract: The present invention relates to a station auxiliary power source apparatus that converts power supplied from an overhead cable to generate power to be supplied to a load in a station. The station auxiliary power source apparatus includes a first average calculation unit that calculates the average value of the overhead cable voltage for every predetermined time period; a second average calculation unit that calculates, two or more times, an average value of the overhead cable voltage that is larger than a first average value of the average value among the overhead cable voltages; a third average calculation unit that calculates an average value of the overhead cable voltage per day; and a comparator that selects any one of a second average value of the average value and a third average value of the average value and sets the selected value as the threshold value.Type: ApplicationFiled: August 8, 2013Publication date: June 9, 2016Applicant: Mitsubishi Electric CorporationInventors: Mitsushi TOMINAGA, Shinichi MATSUMOTO, Shuji ISHIKURA
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Publication number: 20150261247Abstract: A station building power supply device according to the present invention includes: a station building power generation unit including an inverter main circuit and an inverter control circuit to control the inverter main circuit, in which the inverter main circuit converts a voltage supplied from an overhead wire into a voltage required by loads in a station building; a control-circuit power generation unit that converts a voltage supplied to the loads in the station building and generates an input voltage for the inverter control circuit; and a start-up power generation unit that converts a voltage supplied from the overhead wire and generates an input voltage for the inverter control circuit, in a state where the inverter main circuit has stopped the operation and the control-circuit power generation unit has stopped an operation of generating the input voltage for the inverter control circuit.Type: ApplicationFiled: September 5, 2012Publication date: September 17, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takeshi Tanaka, Yasushi Matsumura, Wataru Okuda, Shuji Ishikura
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Patent number: 5585821Abstract: An apparatus and a method of screen display whereby either a plurality of screens or a plurality of windows on a single screen are displayed. On at least one screen or in at least one window, areas representing either the other screens or the other windows are displayed. When a pointer pointing to a given position either on that one screen or in that one window is used to select any one of these areas therein, the pointer is made to appear either on another screen or in another window corresponding to the selected area.Type: GrantFiled: December 20, 1995Date of Patent: December 17, 1996Assignees: Hitachi Ltd., Hitachi Process Computer Engineering, Inc.Inventors: Shuji Ishikura, Takayuki Morioka, Atsuhiko Nishikawa, Kayo Takahashi, Norihito Kanno