Patents by Inventor Hisanori Taguchi
Hisanori Taguchi 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: 10826378Abstract: A control device generates a voltage command value for controlling a current flowing between a three-phase AC power supply and a power converter such that a full voltage representative value representing voltage values of all power storage devices agrees with a DC voltage command value. The control device generates a zero-phase voltage command value for controlling a circulating current flowing in a delta connection such that the voltage values of the power storage devices are balanced among first to third arms. The control device combines the voltage command value and the zero-phase current command value to generate an output voltage command value for controlling an output voltage of each unit converter. The control device removes a control amount of the full voltage representative value from a computation of the zero-phase voltage command value to cause output current control and circulating current control not to interfere with each other.Type: GrantFiled: May 17, 2017Date of Patent: November 3, 2020Assignees: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Kaho Mukunoki, Toshiyuki Fujii, Ryosuke Uda, Taichiro Tsuchiya, Hisanori Taguchi, Ryota Okuyama
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Publication number: 20200161960Abstract: A control device generates a voltage command value for controlling a current flowing between a three-phase AC power supply and a power converter such that a full voltage representative value representing voltage values of all power storage devices agrees with a DC voltage command value. The control device generates a zero-phase voltage command value for controlling a circulating current flowing in a delta connection such that the voltage values of the power storage devices are balanced among first to third arms. The control device combines the voltage command value and the zero-phase current command value to generate an output voltage command value for controlling an output voltage of each unit converter. The control device removes a control amount of the full voltage representative value from a computation of the zero-phase voltage command value to cause output current control and circulating current control not to interfere with each other.Type: ApplicationFiled: May 17, 2017Publication date: May 21, 2020Applicants: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Kaho MUKUNOKI, Toshiyuki FUJII, Ryosuke UDA, Taichiro TSUCHIYA, Hisanori TAGUCHI, Ryota OKUYAMA
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Patent number: 10498251Abstract: Since a power converter including a modular multilevel converter uses a large number of cells each combining a plurality of switching elements and a DC capacitor, there is a problem of conduction loss due to the switching elements. The conduction loss is reduced by connecting a bypass circuit between terminals of each of the cells, controlling to open and close the switching element, and controlling to short-circuit the bypass circuit connected to the cell controlled to output zero voltage.Type: GrantFiled: October 31, 2016Date of Patent: December 3, 2019Assignees: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Osamu Mori, Toshiyuki Fujii, Kaho Mukunoki, Ryosuke Uda, Taichiro Tsuchiya, Akihiro Matsuda, Hisanori Taguchi
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Patent number: 10110110Abstract: When switching operations of converter cells are stopped due to temporary voltage reduction in an AC system, a voltage determination unit performs determination regarding a voltage of each DC capacitor after a predetermined period has passed, and a charge control unit transmits a charging gate signal, via a gate control unit, to select a converter cell at a voltage level at which a self-feeding circuit of the converter cell is operable. Thus, a DC capacitor of a converter cell whose voltage is lower than the voltage level at which a self-feeding circuit is operable is charged, thereby enabling switching operations of all the converter cells.Type: GrantFiled: March 24, 2016Date of Patent: October 23, 2018Assignees: MITSUBISHI ELECTRIC CORPORATION, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Toshiyuki Fujii, Takushi Jimichi, Kaho Mukunoki, Ryosuke Uda, Taichiro Tsuchiya, Akihiro Matsuda, Hisanori Taguchi
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Publication number: 20180302003Abstract: Since a power converter including a modular multilevel converter uses a large number of cells each combining a plurality of switching elements and a DC capacitor, there is a problem of conduction loss due to the switching elements. The conduction loss is reduced by connecting a bypass circuit between terminals of each of the cells, controlling to open and close the switching element, and controlling to short-circuit the bypass circuit connected to the cell controlled to output zero voltage.Type: ApplicationFiled: October 31, 2016Publication date: October 18, 2018Applicants: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Osamu MORI, Toshiyuki FUJII, Kaho MUKUNOKI, Ryosuke UDA, Taichiro TSUCHIYA, Akihiro MATSUDA, Hisanori TAGUCHI
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Patent number: 9960709Abstract: A power conversion device includes: a positive arm and a negative arm each of which is formed by connecting a plurality of converter cells in series, the converter cells each being composed of a plurality of semiconductor switching elements and a DC capacitor; and a control circuit. An arm balance control unit in the control circuit calculates a first voltage adjustment value for balancing voltage of the DC capacitors in the positive arm and voltage of the DC capacitors in the negative arm. The control circuit adjusts an AC control command using the first voltage adjustment value, thereby calculating an AC voltage command for AC voltage to be outputted to an AC line for each phase.Type: GrantFiled: March 7, 2016Date of Patent: May 1, 2018Assignees: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Kaho Mukunoki, Toshiyuki Fujii, Ryosuke Uda, Taichiro Tsuchiya, Akihiro Matsuda, Hisanori Taguchi
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Publication number: 20180069488Abstract: A power conversion device includes: a positive arm and a negative arm each of which is formed by connecting a plurality of converter cells in series, the converter cells each being composed of a plurality of semiconductor switching elements and a DC capacitor; and a control circuit. An arm balance control unit in the control circuit calculates a first voltage adjustment value for balancing voltage of the DC capacitors in the positive arm and voltage of the DC capacitors in the negative arm. The control circuit adjusts an AC control command using the first voltage adjustment value, thereby calculating an AC voltage command for AC voltage to be outputted to an AC line for each phase.Type: ApplicationFiled: March 7, 2016Publication date: March 8, 2018Applicants: MitsubishiElectric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Kaho MUKUNOKI, Toshiyuki FUJII, Ryosuke UDA, Taichiro TSUCHIYA, Akihiro MATSUDA, Hisanori TAGUCHI
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Publication number: 20180062498Abstract: When switching operations of converter cells are stopped due to temporary voltage reduction in an AC system, a voltage determination unit performs determination regarding a voltage of each DC capacitor after a predetermined period has passed, and a charge control unit transmits a charging gate signal, via a gate control unit, to select a converter cell at a voltage level at which a self-feeding circuit of the converter cell is operable. Thus, a DC capacitor of a converter cell whose voltage is lower than the voltage level at which a self-feeding circuit is operable is charged, thereby enabling switching operations of all the converter cells.Type: ApplicationFiled: March 24, 2016Publication date: March 1, 2018Applicants: MITSUBISHI ELECTRIC CORPORATION, TOSHIBA MITSUBISHI- ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Toshiyuki FUJII, Takushi JIMICHI, Kaho MUKUNOKI, Ryosuke UDA, Taichiro TSUCHIYA, Akihiro MATSUDA, Hisanori TAGUCHI
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Patent number: 9048770Abstract: In a synchronous machine starting device, a timing detection unit outputs a first position signal indicating a timing at which a value of an armature voltage passes a prescribed reference level. A feedback operation unit calculates an error of an estimated phase based on the estimated phase, an estimated rotational speed of a rotor, an armature voltage, and an armature current, updates the estimated phase and the estimated rotational speed based on the calculated phase error, and outputs a second position signal indicating the updated estimated phase. A frequency detection unit detects a current rotational speed of the rotor based on the first position signal, as an initial value of the estimated rotational speed. A selector circuit selects the first position signal and the second position signal in this order, and outputs a selected position signal to the power conversion control unit.Type: GrantFiled: October 15, 2010Date of Patent: June 2, 2015Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Shinzo Tamai, Hisanori Taguchi, Yasuhiko Hosokawa, Akinobu Ando
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Patent number: 8872466Abstract: A synchronous-machine starting device includes an electric power conversion unit for converting supplied electric power into AC power for supply to the armature of the synchronous machine, a rotor position detection unit for detecting a position of the rotor of the synchronous machine based on an AC voltage in the armature of the synchronous machine detected by an AC voltage detection unit, an electric power conversion control unit for controlling the electric power conversion unit based on the position of the rotor detected by the rotor position detection unit, and an abnormality detection unit detecting a rotation abnormality of the synchronous machine based on the AC voltage detected by the AC voltage detection unit after supply of the field current to the rotor of the synchronous machine is started.Type: GrantFiled: August 24, 2009Date of Patent: October 28, 2014Assignee: Toshiba Mitsubishi-Electric Industrial Systems CorporationInventors: Shinzo Tamai, Hisanori Taguchi, Akinobu Ando, Yasuhiko Hosokawa
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Publication number: 20130193884Abstract: In a synchronous machine starting device, a timing detection unit outputs a first position signal indicating a timing at which a value of an armature voltage passes a prescribed reference level. A feedback operation unit calculates an error of an estimated phase based on the estimated phase, an estimated rotational speed of a rotor, an armature voltage, and an armature current, updates the estimated phase and the estimated rotational speed based on the calculated phase error, and outputs a second position signal indicating the updated estimated phase. A frequency detection unit detects a current rotational speed of the rotor based on the first position signal, as an initial value of the estimated rotational speed. A selector circuit selects the first position signal and the second position signal in this order, and outputs a selected position signal to the power conversion control unit.Type: ApplicationFiled: October 15, 2010Publication date: August 1, 2013Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATIONInventors: Shinzo Tamai, Hisanori Taguchi, Yasuhiko Hosokawa, Akinobu Ando
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Publication number: 20120161688Abstract: A synchronous-machine starting device includes an electric power conversion unit for converting supplied electric power into AC power for supply to the armature of the synchronous machine, a rotor position detection unit for detecting a position of the rotor of the synchronous machine based on an AC voltage in the armature of the synchronous machine detected by an AC voltage detection unit, an electric power conversion control unit for controlling the electric power conversion unit based on the position of the rotor detected by the rotor position detection unit, and an abnormality detection unit detecting a rotation abnormality of the synchronous machine based on the AC voltage detected by the AC voltage detection unit after supply of the field current to the rotor of the synchronous machine is started.Type: ApplicationFiled: August 24, 2009Publication date: June 28, 2012Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYS. CORP.Inventors: Shinzo Tamai, Hisanori Taguchi, Akinobu Ando, Yasuhiko Hosokawa