Patents by Inventor Yasuhiro Tamai
Yasuhiro Tamai 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: 11283286Abstract: An uninterruptible power supply includes a first detector provided on an input side of a power converter, the first detector detecting a first detection value that is a value of a voltage or current, and a second detector provided on an AC power supply side relative to the first detector, the second detector detecting a second detection value that is a value of a voltage or current input to the uninterruptible power supply module.Type: GrantFiled: December 30, 2020Date of Patent: March 22, 2022Assignee: FUJI ELECTRIC CO., LTD.Inventor: Yasuhiro Tamai
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Patent number: 11165278Abstract: In an uninterruptible power supply system, an uninterruptible power supply operates based on a command to an inverter held in a holder before an abnormality occurs in communication when the abnormality occurs in the communication between an operation board and the uninterruptible power supply.Type: GrantFiled: August 24, 2020Date of Patent: November 2, 2021Assignee: FUJI ELECTRIC CO., LTD.Inventor: Yasuhiro Tamai
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Publication number: 20210119475Abstract: An uninterruptible power supply includes a first detector provided on an input side of a power converter, the first detector detecting a first detection value that is a value of a voltage or current, and a second detector provided on an AC power supply side relative to the first detector, the second detector detecting a second detection value that is a value of a voltage or current input to the uninterruptible power supply module.Type: ApplicationFiled: December 30, 2020Publication date: April 22, 2021Inventor: Yasuhiro TAMAI
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Publication number: 20200389046Abstract: In an uninterruptible power supply system, an uninterruptible power supply operates based on a command to an inverter held in a holder before an abnormality occurs in communication when the abnormality occurs in the communication between an operation board and the uninterruptible power supply.Type: ApplicationFiled: August 24, 2020Publication date: December 10, 2020Inventor: Yasuhiro TAMAI
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Patent number: 10797512Abstract: An uninterruptible power supply includes a power converter, a detector that detects a voltage value or a current value, and a controller that controls the power converter based on the detected voltage value or current value and generates one or more command values. The controller compares the one or more command values with predetermined reference values respectively corresponding to the one or more command values.Type: GrantFiled: January 29, 2019Date of Patent: October 6, 2020Assignee: FUJI ELECTRIC CO., LTD.Inventor: Yasuhiro Tamai
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Patent number: 10693316Abstract: An uninterruptible power supply includes a main uninterruptible power supply unit including a converter, an inverter, and a battery, as well as an input transformer which is arranged between an AC power supply and the converter and transforms the AC voltage from the AC power supply. The uninterruptible power supply further includes a DC component extraction unit that extracts a DC component from current flowing between the AC power supply and the converter, as well as a CPU which, when the DC component extracted by the DC component extraction unit is greater than a threshold current, stops operation of the converter and causes DC voltage from the battery to be supplied to the inverter.Type: GrantFiled: December 6, 2018Date of Patent: June 23, 2020Assignee: FUJI ELECTRIC CO., LTD.Inventor: Yasuhiro Tamai
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Publication number: 20190214847Abstract: An uninterruptible power supply includes a main uninterruptible power supply unit including a converter, an inverter, and a battery, as well as an input transformer which is arranged between an AC power supply and the converter and transforms the AC voltage from the AC power supply. The uninterruptible power supply further includes a DC component extraction unit that extracts a DC component from current flowing between the AC power supply and the converter, as well as a CPU which, when the DC component extracted by the DC component extraction unit is greater than a threshold current, stops operation of the converter and causes DC voltage from the battery to be supplied to the inverter.Type: ApplicationFiled: December 6, 2018Publication date: July 11, 2019Applicant: Fuji Electric Co., Ltd.Inventor: Yasuhiro TAMAI
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Publication number: 20190157901Abstract: An uninterruptible power supply includes a power converter, a detector that detects a voltage value or a current value, and a controller that controls the power converter based on the detected voltage value or current value and generates one or more command values. The controller compares the one or more command values with predetermined reference values respectively corresponding to the one or more command values.Type: ApplicationFiled: January 29, 2019Publication date: May 23, 2019Applicant: FUJI ELECTRIC CO., LTD.Inventor: Yasuhiro Tamai
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Publication number: 20150329760Abstract: A graphite sheet includes: a graphite portion made of a graphite; and at least one ceramic filler provided within the graphite portion, having a substantially spherical shape, and made of a ceramic having a thermal conductivity higher than a thermal conductivity in a c-axis direction of the graphite.Type: ApplicationFiled: May 14, 2015Publication date: November 19, 2015Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, TOYO TANSO CO., LTD.Inventors: Rentaro MORI, Sumio KAMIYA, Hitoshi ISHII, Kiyohito ITAKURA, Yasuhiro TAMAI, Tomoharu MINAMI, Nobuya MISAKI
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Patent number: 7888895Abstract: An electric power supply system for driving an electric rotating machine has a generator supplied with driving power from an engine to generate alternating-current electric power and a matrix converter as an alternating-current to alternating-current direct converter supplied with the alternating-current electric power to output arbitrary alternating-current electric power. By driving a motor with the alternating-current electric power supplied from the matrix converter, only one time electric power conversion is carried out to provide high efficiency in the whole system. In addition, electric power loss can be reduced so as to enhance a motor output when the system is applied to a vehicle power supply system.Type: GrantFiled: February 19, 2008Date of Patent: February 15, 2011Assignee: Fuji Electric Systems Co., Ltd.Inventors: Yasuhiro Tamai, Akihiro Odaka, Masakazu Gekinozu
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Patent number: 7863961Abstract: An ECU serving as a transmission side and an ECU serving as a reception side are coupled to each other through communication lines and junction connectors. A diode in which a direction directed from a negative-side output terminal of the ECU serving as the transmission side to a positive-side output terminal thereof becomes a forward direction is provided between the positive-side output terminal and the negative-side output terminal.Type: GrantFiled: September 29, 2005Date of Patent: January 4, 2011Assignee: Yazaki CorporationInventor: Yasuhiro Tamai
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Patent number: 7821802Abstract: A power converter directly converting an AC voltage into an AC voltage of any desired magnitude and frequency by turning bidirectional switches ON and OFF without employing any energy buffer, where the peak values of output phase voltage command values are limited, to bring the amplitude of an output line voltage to, at most, 0.866 times the amplitude of the supply line voltages. By way of example, the peak-value limit of the output phase voltage command values is set so that the maximum value of the output phase voltage command values becomes, at most, 0.75 times the maximum value of supply phase voltages, while the minimum value thereof becomes, at least, 0.75 times the minimum value of the supply phase voltages. This control method for the direct power converter dispenses with an expensive dedicated motor, and permits a reduction in cost of the control apparatus as a whole.Type: GrantFiled: July 31, 2007Date of Patent: October 26, 2010Assignee: Fuji Electric Systems Co., Ltd.Inventors: Akihiro Odaka, Ikuya Sato, Yasuhiro Tamai
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Patent number: 7804858Abstract: A transmission ECU on a transmission side and reception ECUs on a reception side are connected through communication lines and junction connectors. A delay circuit is provided in each of the junction connectors on the side of the reception ECUs. One end of the delay circuit is connected to the communication line on the side of the transmission ECU and the other end of the same is connected to the communication line on the side of the reception ECU. The communication lines on the both ends of the delay circuit are grounded through termination resistors.Type: GrantFiled: October 5, 2005Date of Patent: September 28, 2010Assignee: Yazaki CorporationInventor: Yasuhiro Tamai
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Patent number: 7696730Abstract: A control apparatus for an AC-AC direct converter. The control apparatus includes a calculator providing a phase command ?* of an output voltage of the converter, a calculator providing a q-axis current iq by using output currents iu and iw and the phase command ?*, a detector detecting a pulsation component contained in the q-axis current iq, a calculator providing a phase correction magnitude ?cmp so as to decrease the pulsation component, and an adder/subtractor correcting the phase command ?* by using the correction magnitude ?cmp. This apparatus can decrease the output voltage distortion and low frequency torque pulsation and can suppress the increase of an output current without weakening a magnetic flux, even when the converter is operated in an overmodulation region.Type: GrantFiled: July 31, 2007Date of Patent: April 13, 2010Assignee: Fuji Electric Systems Co., Ltd.Inventors: Yasuhiro Tamai, Tatsuya Yamada
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Publication number: 20080211437Abstract: An electric power supply system for driving an electric rotating machine has a generator supplied with driving power from an engine to generate alternating-current electric power and a matrix converter as an alternating-current to alternating-current direct converter supplied with the alternating-current electric power to output arbitrary alternating-current electric power. By driving a motor with the alternating-current electric power supplied from the matrix converter, only one time electric power conversion is carried out to provide high efficiency in the whole system. In addition, electric power loss can be reduced so as to enhance a motor output when the system is applied to a vehicle power supply system.Type: ApplicationFiled: February 19, 2008Publication date: September 4, 2008Applicant: FUJI ELECTRIC DEVICE TECHNOLOGY CO., LTD.Inventors: Yasuhiro TAMAI, Akihiro ODAKA, Masakazu GEKINOZU
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Publication number: 20080055955Abstract: A control apparatus for an AC-AC direct converter. The control apparatus includes a calculator providing a phase command ?* of an output voltage of the converter, a calculator providing a q-axis current iq by using output currents iu and iw and the phase command ?*, a detector detecting a pulsation component contained in the q-axis current iq, a calculator providing a phase correction magnitude ?cmp so as to decrease the pulsation component, and an adder/subtractor correcting the phase command ?* by using the correction magnitude ?cmp. This apparatus can decrease the output voltage distortion and low frequency torque pulsation and can suppress the increase of an output current without weakening a magnetic flux, even when the converter is operated in an overmodulation region.Type: ApplicationFiled: July 31, 2007Publication date: March 6, 2008Applicant: Fuji Electric FA Components & Systems Co., Ltd.Inventors: Yasuhiro Tamai, Tatsuya Yamada
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Publication number: 20080049469Abstract: A power converter directly converting an AC voltage into an AC voltage of any desired magnitude and frequency by turning bidirectional switches ON and OFF without employing any energy buffer, where the peak values of output phase voltage command values are limited, to bring the amplitude of an output line voltage to, at most, 0.866 times the amplitude of the supply line voltages. By way of example, the peak-value limit of the output phase voltage command values is set so that the maximum value of the output phase voltage command values becomes, at most, 0.75 times the maximum value of supply phase voltages, while the minimum value thereof becomes, at least, 0.75 times the minimum value of the supply phase voltages. This control method for the direct power converter dispenses with an expensive dedicated motor, and permits a reduction in cost of the control apparatus as a whole.Type: ApplicationFiled: July 31, 2007Publication date: February 28, 2008Applicant: Fuji Electric FA Components & Systems Co., Ltd.Inventors: Akihiro Odaka, Ikuya Sato, Yasuhiro Tamai
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Patent number: 7116009Abstract: A power distributing apparatus is provided to reduce the number of voltage converters. The power distributing apparatus 1 includes a power source part 4 for supplying a power of 42V, an electrical connection box 7 connected with the part 4 through a power line 5, and a plurality of electronic control units 8a, 8b . . . , 8n. The electrical connection box 7 has a regular-supply converter 9 to convert a high voltage of 42V to an intermediate voltage higher than a load voltage of 5V. The regular-supply converter 9 can exhibit a high conversion efficiency when the apparatus is operated under high load. Each of the electronic control units 8a, 8b . . . , 8n has a series regulator 14 to convert the intermediate voltage to the load voltage. Owing to the supply of voltage higher than the load voltage by the regular-supply converter 9, there is no need to consider inconvenience due to voltage drop between the converter and a remote load.Type: GrantFiled: August 6, 2002Date of Patent: October 3, 2006Assignee: Yazaki CorporationInventors: Yasuhiro Tamai, Tetsuya Hasegawa
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Publication number: 20060072630Abstract: A transmission ECU on a transmission side and reception ECUs on a reception side are connected through communication lines and junction connectors. A delay circuit is provided in each of the junction connectors on the side of the reception ECUs. One end of the delay circuit is connected to the communication line on the side of the transmission ECU and the other end of the same is connected to the communication line on the side of the reception ECU. The communication lines on the both ends of the delay circuit are grounded through termination resistors.Type: ApplicationFiled: October 5, 2005Publication date: April 6, 2006Inventor: Yasuhiro Tamai
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Publication number: 20060066358Abstract: An ECU serving as a transmission side and an ECU serving as a reception side are coupled to each other through communication lines and junction connectors. A diode in which a direction directed from a negative-side output terminal of the ECU serving as the transmission side to a positive-side output terminal thereof becomes a forward direction is provided between the positive-side output terminal and the negative-side output terminal.Type: ApplicationFiled: September 29, 2005Publication date: March 30, 2006Inventor: Yasuhiro Tamai