Patents by Inventor Hironari Kawazoe
Hironari Kawazoe 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: 11942873Abstract: A secondary magnetic excitation generator-motor device that inputs a first ignition pulse command to a three-level NPC power converter such that a detected excitation current value corresponds with an excitation current command value, the secondary magnetic excitation generator-motor device having a function of identifying a first phase, a second phase, or a third phase in descending order of a current absolute value, wherein a pulse switch to output an ignition pulse command to the three-level NPC power converter switches the ignition pulse command to the second ignition pulse command when a current absolute value exceeds a set overcurrent level 1, and switches the ignition pulse command to the first ignition pulse command when current absolute values for three phases are all equal to or smaller than a set overcurrent level 2.Type: GrantFiled: August 8, 2019Date of Patent: March 26, 2024Assignees: HITACHI MITSUBISHI HYDRO CORPORATION, HITACHI, LTD.Inventors: Akira Bando, Hironari Kawazoe, Akira Kikuchi
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Publication number: 20220231615Abstract: A secondary magnetic excitation generator-motor device that inputs a first ignition pulse command to a three-level NPC power converter such that a detected excitation current value corresponds with an excitation current command value, the secondary magnetic excitation generator-motor device having a function of identifying a first phase, a second phase, or a third phase in descending order of a current absolute value, wherein a pulse switch to output an ignition pulse command to the three-level NPC power converter switches the ignition pulse command to the second ignition pulse command when a current absolute value exceeds a set overcurrent level 1, and switches the ignition pulse command to the first ignition pulse command when current absolute values for three phases are all equal to or smaller than a set overcurrent level 2.Type: ApplicationFiled: August 8, 2019Publication date: July 21, 2022Inventors: Akira BANDO, Hironari KAWAZOE, Akira KIKUCHI
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Patent number: 9344020Abstract: A power conversion apparatus includes arms in each of which one or more unit converters each including a capacitor and capable of outputting an arbitrary voltage are connected in series, and a point P as a first node to which one end of the respective arms are Y-connected, and a point N as a second node to which a neutral terminal of the rotary electric machine is connected. The other end of the respective arms are connected to one ends of respective phase windings of a rotary electric machine.Type: GrantFiled: July 1, 2014Date of Patent: May 17, 2016Assignee: Hitachi, Ltd.Inventors: Shigenori Inoue, Shuji Katoh, Hironari Kawazoe, Osamu Tomobe, Toru Yoshihara, Kenta Watanabe
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Publication number: 20150008859Abstract: A power conversion apparatus includes arms in each of which one or more unit converters each including a capacitor and capable of outputting an arbitrary voltage are connected in series, and a point P as a first node to which one end of the respective arms are Y-connected, and a point N as a second node to which a neutral terminal of the rotary electric machine is connected. The other end of the respective arms are connected to one ends of respective phase windings of a rotary electric machine.Type: ApplicationFiled: July 1, 2014Publication date: January 8, 2015Applicant: HITACHI, LTD.Inventors: Shigenori INOUE, I, Shuji KATOH, Hironari KAWAZOE, Osamu TOMOBE, Toru YOSHIHARA, Kenta WATANABE
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Patent number: 7863904Abstract: A fuel cell detection device according to the present invention includes: a cell block formed with a plurality of cells serially connected to each other; a voltage detection element for detecting voltages of the cells within the cell block; and another voltage detection element for detecting a voltage of the operating power source of the voltage detection element, where the operating power source of the voltage detection element is supplied from a voltage of the inside or both ends of the cell block, and the operating power source of another voltage detection element is supplied from a voltage of the outside of the cell block, the operating power source of another voltage detection element being less variable than the operating power source of the voltage detection element.Type: GrantFiled: September 26, 2006Date of Patent: January 4, 2011Assignee: Hitachi, Ltd.Inventors: Kenji Takeda, Hironari Kawazoe, Motoo Futami, Masahiro Komachiya
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Patent number: 7855467Abstract: A hybrid system using a wind-power generator and a battery energy storage system includes a unit to set a system constant output value, a unit to control power generated from the wind-power generator, a unit to gradually change an output target value between an output constant operation and a regulation control operation, and a control unit to secure a charged ampere-hour of a battery in the output constant operation.Type: GrantFiled: January 17, 2008Date of Patent: December 21, 2010Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Hironari Kawazoe, Motoo Futami, Youji Ikeda, Yoshiaki Sato
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Publication number: 20080179887Abstract: A hybrid system using a wind-power generator and a battery energy storage system includes a unit to set a system constant output value, a unit to control power generated from the wind-power generator, a unit to gradually change an output target value between an output constant operation and a regulation control operation, and a control unit to secure a charged ampere-hour of a battery in the output constant operation.Type: ApplicationFiled: January 17, 2008Publication date: July 31, 2008Inventors: Hironari Kawazoe, Motoo Futami, Youji Ikeda, Yoshiaki Sato
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Publication number: 20070202371Abstract: A fuel cell detection device according to the present invention includes: a cell block formed with a plurality of cells serially connected to each other; a voltage detection element for detecting voltages of the cells within the cell block; and another voltage detection element for detecting a voltage of the operating power source of the voltage detection element, where the operating power source of the voltage detection element is supplied from a voltage of the inside or both ends of the cell block, and the operating power source of another voltage detection element is supplied from a voltage of the outside of the cell block, the operating power source of another voltage detection element being less variable than the operating power source of the voltage detection element.Type: ApplicationFiled: September 26, 2006Publication date: August 30, 2007Inventors: Kenji Takeda, Hironari Kawazoe, Motoo Futami, Masahiro Komachiya
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Publication number: 20070178345Abstract: A fuel cell module of the present invention includes a fuel cell stack and a power converter incorporated respectively in the casing. The power converter has a printed circuit board and a switching semiconductor. The printed circuit board is arranged between the switching semiconductor and the fuel cell stack, thereby cutting off the radiation of heat from the fuel cell stack to the switching semiconductor, and reducing the conduction loss of the switching semiconductor. Further, a high frequency transformer equipped with a Ferrite core is arranged on the side of the fuel cell stack of the printed circuit board, thereby reducing the iron loss in the high frequency transformer.Type: ApplicationFiled: September 28, 2006Publication date: August 2, 2007Inventors: Kenji Takeda, Hironari Kawazoe, Katsunori Nishimura
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Patent number: 6731522Abstract: A power generation apparatus includes a permanent-magnet AC generator, a first converter for converting AC power into DC power, and a second converter for converting the DC power produced by the first converter into AC power. The first converter includes a unit for controlling active power and a unit for controlling reactive power and the second converter includes a unit for controlling a voltage of a DC system and reactive power or AC voltage of a power system.Type: GrantFiled: April 17, 2003Date of Patent: May 4, 2004Assignee: Hitachi, Ltd.Inventors: Hironari Kawazoe, Motoo Futami, Akira Kikuchi
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Publication number: 20030214823Abstract: A power generation apparatus includes a permanent-magnet AC generator, a first converter for converting AC power into DC power, and a second converter for converting the DC power produced by the first converter into AC power. The first converter includes a unit for controlling active power and a unit for controlling reactive power and the second converter includes a unit for controlling a voltage of a DC system and reactive power or AC voltage of a power system.Type: ApplicationFiled: April 17, 2003Publication date: November 20, 2003Applicant: Hitachi, Ltd.Inventors: Hironari Kawazoe, Motoo Futami, Akira Kikuchi
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Patent number: 6611438Abstract: A power generation apparatus includes a permanent-magnet AC generator, a first converter for converting AC power into DC power, and a second converter for converting the DC power produced by the first converter into AC power. The first converter includes a unit for controlling active power and a unit for controlling reactive power and the second converter includes a unit for controlling a voltage of a DC system and reactive power or AC voltage of a power system.Type: GrantFiled: July 11, 2002Date of Patent: August 26, 2003Assignee: Hitachi, Ltd.Inventors: Hironari Kawazoe, Motoo Futami, Akira Kikuchi
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Patent number: 6611437Abstract: A power generation apparatus includes a permanent-magnet AC generator, a first converter for converting AC power into DC power, and a second converter for converting the DC power produced by the first converter into AC power. The first converter includes a unit for controlling active power and a unit for controlling reactive power and the second converter includes a unit for controlling a voltage of a DC system and reactive power or AC voltage of a power system.Type: GrantFiled: March 19, 2002Date of Patent: August 26, 2003Assignee: Hitachi, Ltd.Inventors: Hironari Kawazoe, Motoo Futami, Akira Kikuchi
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Publication number: 20030007371Abstract: A power generation apparatus includes a permanent-magnet AC generator, a first converter for converting AC power into DC power, and a second converter for converting the DC power produced by the first converter into AC power. The first converter includes a unit for controlling active power and a unit for controlling reactive power and the second converter includes a unit for controlling a voltage of a DC system and reactive power or AC voltage of a power system.Type: ApplicationFiled: July 11, 2002Publication date: January 9, 2003Inventors: Hironari Kawazoe, Motoo Futami, Akira Kikuchi
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Publication number: 20030007368Abstract: A power generation apparatus includes a permanent-magnet AC generator, a first converter for converting AC power into DC power, and a second converter for converting the DC power produced by the first converter into AC power. The first converter includes a unit for controlling active power and a unit for controlling reactive power and the second converter includes a unit for controlling a voltage of a DC system and reactive power or AC voltage of a power system.Type: ApplicationFiled: March 19, 2002Publication date: January 9, 2003Inventors: Hironari Kawazoe, Motoo Futami, Akira Kikuchi
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Patent number: 5349522Abstract: An AC system having, for example, a voltage source, an inductance and a load has connected thereto an apparatus for controlling the phase and amplitude of the voltage of the system. The instantaneous current and voltage in the AC electrical system are measured and power measurements derived therefrom. The power measurements may be instantaneous real and imaginary power, instantaneous active and reactive power, or active and reactive power averaged over less than one cycle. The power measurements are then used to derive phase related control values, on the basis of which control signals are generated to a converter. The action of the converter in accordance with the control signals thus controls the amplitude and phase of the voltage. By use of power measurements, it is not necessary to measure the phase of the voltage of the AC system.Type: GrantFiled: June 12, 1992Date of Patent: September 20, 1994Assignee: Hitachi, Ltd.Inventors: Hiroo Konishi, Hironari Kawazoe, Junzo Kawakami, Tomoharu Nakamura, Yukio Tokiwa, Tatsuhito Nakajima