Patents by Inventor Ryuichi Morikawa
Ryuichi Morikawa 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: 10938319Abstract: According to an embodiment, there is provided an apparatus which can hold down an energy loss and can avoid an increase in size. The apparatus includes a cell including a floating capacitor connected in parallel to an upper-side switching element and a lower-side switching element; an upper arm include including first switch circuits, each including a first switching element, a first diode and a first capacitor, are connected in series; a lower arm including second switch circuits, each including a second switching element, a second diode and a second capacitor, are connected in series; and a circuit which connects a low-side terminal of the cell and a low-side terminal of the first capacitor and connects a high-side terminal of the cell and a high-side terminal of the second capacitor.Type: GrantFiled: July 17, 2020Date of Patent: March 2, 2021Assignee: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji Maki, Hiroshi Mochikawa, Yushi Koyama, Shunsuke Tamada, Takuro Arai, Ryuichi Morikawa, Mami Mizutani
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Publication number: 20200350832Abstract: According to an embodiment, there is provided an apparatus which can hold down an energy loss and can avoid an increase in size. The apparatus includes a cell including a floating capacitor connected in parallel to an upper-side switching element and a lower-side switching element; an upper arm include including first switch circuits, each including a first switching element, a first diode and a first capacitor, are connected in series; a lower arm including second switch circuits, each including a second switching element, a second diode and a second capacitor, are connected in series; and a circuit which connects a low-side terminal of the cell and a low-side terminal of the first capacitor and connects a high-side terminal of the cell and a high-side terminal of the second capacitor.Type: ApplicationFiled: July 17, 2020Publication date: November 5, 2020Applicant: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji MAKI, Hiroshi Mochikawa, Yushi Koyama, Shunsuke Tamada, Takuro Arai, Ryuichi Morikawa, Mami Mizutani
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Patent number: 8570695Abstract: Provided is a battery system capable of preventing the voltage that is applied to the voltage detection circuit from exceeding the withstand voltage of the voltage detection circuit when the connection between the cells in the battery module is disconnected, and preventing an overcurrent from flowing in the cell voltage detection circuit and the module. The modules are internally provided with a battery voltage measurement circuit 2 for measuring the voltage of each cell. A reverse voltage protective diode 3 is disposed in the power supply route of the battery voltage measurement circuit 2, and adapted such that the anode thereof is connected to the negative electrode of a drive power source of the voltage measurement circuit and the cathode thereof is connected to the positive electrode of the drive power source of the voltage measurement circuit. A fuse 4 as an overcurrent protective element is provided to the power supply route of the battery voltage measurement circuit 2.Type: GrantFiled: March 5, 2009Date of Patent: October 29, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Nobuo Shibuya, Kazuhide Ashida, Ryuichi Morikawa, Shinichiro Kosugi
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Patent number: 8400102Abstract: According to one of the embodiment, an assembled battery has a plurality of cells electrically connected in series. A charge amount difference detection circuit detects charge amount difference of the cells. Wherein, while a charging or discharge current is being applied to the cells, the charge amount difference detection circuit detects charge amount differences greater than a charge amount of a reference cell having a minimum charge amount, the charge amount differences of the cells are determined by addition of the charging or discharge currents during a period corresponding to the time differences between the reference cell and the other cells reaching a predetermined specific voltage, discharge switches are controlled by a switch controller, based on the charging amount differences.Type: GrantFiled: July 15, 2010Date of Patent: March 19, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Mami Mizutani, Ryuichi Morikawa, Masahiro Tohara, Shinichiro Kosugi
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Patent number: 8384351Abstract: A battery system includes a battery unit in which battery arms are connected in parallel, and a charge/discharge control device that controls charge/discharge of the battery unit. Each of the battery arms includes: a battery composed of one or more battery cells connected in series; a switch connected in series to the battery; and a battery monitoring device that, in a case of having detected abnormality of the battery, opens the switch to thereby isolate the battery arm including the abnormal battery, and sends a switch opening signal indicating that the switch has been opened to the charge/discharge control device. The charge/discharge control device performs a control to reduce a charge/discharge current or charge/discharge power of the battery unit when the switch opening signal is sent from the battery monitoring device of the battery unit to the charge/discharge control device.Type: GrantFiled: September 25, 2009Date of Patent: February 26, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Yukitaka Monden, Ryuichi Morikawa, Mami Mizutani, Yuki Kuwano, Masayuki Kubota, Yasuyuki Ito
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Patent number: 8368353Abstract: According to one embodiment, the power supply management portion includes a timer configured to output an ON signal every time set by the control circuit, an OR circuit configured to receive supply of an output signal from the timer, an external signal supplied from outside, and a switch control signal output from the control circuit, and a switch circuit configured to switch output of the power source voltage from an external power source according to an output signal from the OR circuit, and the control circuit turns on a switch control signal after confirming which of the output signal from the timer or the external signal has turned on the switch circuit and turns off the switch control signal when both of the output signal from the timer and the signal supplied from outside are turned off.Type: GrantFiled: August 31, 2010Date of Patent: February 5, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Takashi Akiba, Mami Mizutani, Fumiyuki Yamane, Yuki Kuwano, Ryuichi Morikawa, Shuji Ono, Nobuo Shibuya, Kazuto Kuroda, Shinichiro Kosugi, Yasuhiro Miyamoto
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Patent number: 8354813Abstract: A torque limit section that applies limit to a torque instruction value of an electric motor such that a switching elements temperature is restricted to no more than an element upper limiting temperature includes a torque restriction section that finds a torque restriction value for restricting the torque of the electric motor in accordance with the said switching elements temperature; a torque restriction mitigation section that finds a torque restriction mitigation value for mitigating the torque limit value in accordance with the integrated value of the deviation of the element upper limiting temperature and the switching elements temperature; a first subtractor that finds a torque restriction value by subtracting the torque restriction mitigation value from the torque limit value; and a second subtractor that finds a limited torque instruction value obtained by subtracting the torque limit value from the torque instruction value and outputs this to the gate generating section.Type: GrantFiled: December 10, 2008Date of Patent: January 15, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Ryuta Hasegawa, Ryuichi Morikawa, Toshiharu Oobu
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Patent number: 7969227Abstract: According to one embodiment, a temperature detection circuit is provided which requires only a small number of additional components, thus minimizing an increase in costs and which offers an insulating property and high responsiveness. A temperature detection circuit outputs a first PWM signal corresponding to a temperature of a first temperature sensor from a photointerrupter as a signal insulated from the first temperature sensor. A temperature detection circuit outputs a second PWM signal corresponding to a temperature of a second temperature sensor from a photointerrupter as a signal insulated from the second temperature sensor. A controlling arithmetic apparatus calculates a higher one of the temperatures detected by the first and second temperature sensors based on the PWM signals output from the photointerrupter.Type: GrantFiled: October 18, 2010Date of Patent: June 28, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Ryuta Hasegawa, Ryuichi Morikawa, Nobumitsu Tada, Masami Hirata
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Publication number: 20110149454Abstract: Provided is a battery system capable of preventing the voltage that is applied to the voltage detection circuit from exceeding the withstand voltage of the voltage detection circuit when the connection between the cells in the battery module is disconnected, and preventing an overcurrent from flowing in the cell voltage detection circuit and the module. The modules are internally provided with a battery voltage measurement circuit 2 for measuring the voltage of each cell. A reverse voltage protective diode 3 is disposed in the power supply route of the battery voltage measurement circuit 2, and adapted such that the anode thereof is connected to the negative electrode of a drive power source of the voltage measurement circuit and the cathode thereof is connected to the positive electrode of the drive power source of the voltage measurement circuit. A fuse 4 as an overcurrent protective element is provided to the power supply route of the battery voltage measurement circuit 2.Type: ApplicationFiled: March 5, 2009Publication date: June 23, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Nobuo Shibuya, Kazuhide Ashida, Ryuichi Morikawa, Shinichiro Kosugi
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Publication number: 20110050169Abstract: According to one embodiment, the power supply management portion includes a timer configured to output an ON signal every time set by the control circuit, an OR circuit configured to receive supply of an output signal from the timer, an external signal supplied from outside, and a switch control signal output from the control circuit, and a switch circuit configured to switch output of the power source voltage from an external power source according to an output signal from the OR circuit, and the control circuit turns on a switch control signal after confirming which of the output signal from the timer or the external signal has turned on the switch circuit and turns off the switch control signal when both of the output signal from the timer and the signal supplied from outside are turned off.Type: ApplicationFiled: August 31, 2010Publication date: March 3, 2011Inventors: Takashi AKIBA, Mami Mizutani, Fumiyuki Yamane, Yuki Kuwano, Ryuichi Morikawa, Shuji Ono, Nobuo Shibuya, Kazuto Kuroda, Shinichiro Kosugi, Yasuhiro Miyamoto
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Publication number: 20110032001Abstract: According to one embodiment, a temperature detection circuit is provided which requires only a small number of additional components, thus minimizing an increase in costs and which offers an insulating property and high responsiveness. A temperature detection circuit outputs a first PWM signal corresponding to a temperature of a first temperature sensor from a photointerrupter as a signal insulated from the first temperature sensor. A temperature detection circuit outputs a second PWM signal corresponding to a temperature of a second temperature sensor from a photointerrupter as a signal insulated from the second temperature sensor. A controlling arithmetic apparatus calculates a higher one of the temperatures detected by the first and second temperature sensors based on the PWM signals output from the photointerrupter.Type: ApplicationFiled: October 18, 2010Publication date: February 10, 2011Inventors: Ryuta HASEGAWA, Ryuichi Morikawa, Nobumitsu Tada, Masami Hirata
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Publication number: 20110011653Abstract: According to one of the embodiment, an assembled battery has a plurality of cells electrically connected in series. A charge amount difference detection circuit detects charge amount difference of the cells. Wherein, while a charging or discharge current is being applied to the cells, the charge amount difference detection circuit detects charge amount differences greater than a charge amount of a reference cell having a minimum charge amount, the charge amount differences of the cells are determined by addition of the charging or discharge currents during a period corresponding to the time differences between the reference cell and the other cells reaching a predetermined specific voltage, discharge switches are controlled by a switch controller, based on the charging amount differences.Type: ApplicationFiled: July 15, 2010Publication date: January 20, 2011Inventors: Mami Mizutani, Ryuichi Morikawa, Masahiro Tohara, Shinichiro Kosugi
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Publication number: 20100320951Abstract: A torque limit section that applies limit to a torque instruction value of an electric motor such that a switching elements temperature is restricted to no more than an element upper limiting temperature includes a torque restriction section that finds a torque restriction value for restricting the torque of the electric motor in accordance with the said switching elements temperature; a torque restriction mitigation section that finds a torque restriction mitigation value for mitigating the torque limit value in accordance with the integrated value of the deviation of the element upper limiting temperature and the switching elements temperature; a first subtractor that finds a torque restriction value by subtracting the torque restriction mitigation value from the torque limit value; and a second subtractor that finds a limited torque instruction value obtained by subtracting the torque limit value from the torque instruction value and outputs this to the gate generating section.Type: ApplicationFiled: December 10, 2008Publication date: December 23, 2010Applicant: Kabushiki Kaisha ToshibaInventors: Ryuta Hasegawa, Ryuichi Morikawa, Toshiharu Oobu
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Publication number: 20100308775Abstract: A battery pack is a battery pack chargeable a normal charge and a quick charge, and includes: a normal charging terminal 10 (11, 12) configured to apply a current of a first predetermined value to a battery cell; and a quick charging terminal 30 (31, 32) configured to apply to the battery cell a current of a second predetermined value exceeding the first predetermined value, the quick charging terminal having a different shape from a shape of the normal charging terminal.Type: ApplicationFiled: January 15, 2009Publication date: December 9, 2010Applicant: Kabushiki Kaisha ToshibaInventors: Mami Mizutani, Ryuichi Morikawa, Yukitaka Monden, Fumitaka Mouri, Takeo Kakuchi, Takafumi Nakahama
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Publication number: 20100244845Abstract: A current integrating circuit device, including a current sensor to detect a current flowing through a current path, a first-order lag filter to filter an output of the current sensor, an A/D converter to convert an analog signal filtered by the first-order lag filter into a digital signal, and a proportional integrator to proportionally integrate the digital signal outputted from the A/D converter.Type: ApplicationFiled: March 3, 2010Publication date: September 30, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Ryuichi Morikawa, Masayuki Kubota, Mami Mizutani, Yukitaka Monden, Yuki Kuwano, Masahiro Tohara
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Publication number: 20100090653Abstract: A battery device includes electric cells connected in series, resistors connected to respective electrodes of the electric cells, discharge switches for discharging voltages between the respective electrodes of each of the battery cells via the resistors, and a voltage detection and control circuit. When a detection voltage when the discharge switch is closed and not disconnected is defined as V, a detection voltage when a discharge switch is closed and disconnected is defined as VS, and a detection voltage when a discharge switch is not closed and not disconnected is defined as VE, the voltage detection and control circuit arranges a relationship between a disconnect determination voltage VSL and a discharge malfunction determination voltage VSH so as to be VE>VSH>V>VSL>V.Type: ApplicationFiled: October 9, 2009Publication date: April 15, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yuuki KUWANO, Ryuichi Morikawa, Mami Mizutani, Yukitaka Monden, Masayuki Kubota
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Publication number: 20100079108Abstract: A battery system includes a battery unit in which battery arms are connected in parallel, and a charge/discharge control device that controls charge/discharge of the battery unit. Each of the battery arms includes: a battery composed of one or more battery cells connected in series; a switch connected in series to the battery; and a battery monitoring device that, in a case of having detected abnormality of the battery, opens the switch to thereby isolate the battery arm including the abnormal battery, and sends a switch opening signal indicating that the switch has been opened to the charge/discharge control device. The charge/discharge control device performs a control to reduce a charge/discharge current or charge/discharge power of the battery unit when the switch opening signal is sent from the battery monitoring device of the battery unit to the charge/discharge control device.Type: ApplicationFiled: September 25, 2009Publication date: April 1, 2010Applicant: Kabushiki Kaisha ToshibaInventors: Yukitaka MONDEN, Ryuichi Morikawa, Mami Mizutani, Yuki Kuwano, Masayuki Kubota, Yasuyuki Ito
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Patent number: 7671372Abstract: A digital signal transfer device generates from a modulating section (100) a modulated signal responsive to a digital input signal and transfers this to a demodulating section (200) through a pulse transformer (6). The demodulating section (200) generates from the modulated signal an output signal in which the digital input signal waveform is restored.Type: GrantFiled: August 31, 2005Date of Patent: March 2, 2010Assignee: Kabushiki Kaisha ToshibaInventor: Ryuichi Morikawa
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Publication number: 20100019724Abstract: A battery system in which module batteries, each of which includes cell batteries connected in series, are connected to one another. Each of the module batteries includes: a cell voltage detection/inter-cell balancing circuit that detects a cell voltage of each of the cell batteries to then create a cell voltage signal, and balances energies among the cell batteries based on the created cell voltage signal; and an inter-module balancing circuit that balances energies among the module batteries based on a module voltage obtained by summing up the cell voltages of the cell batteries.Type: ApplicationFiled: July 23, 2009Publication date: January 28, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Mami Mizutani, Ryuichi Morikawa, Yukitaka Monden, Takeo Kakuchi, Takafumi Nakahama
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Publication number: 20090237890Abstract: A semiconductor device includes: a semiconductor element (106) having a surface on a positive electrode side and a surface on a negative electrode side; multiple conductors (13 to 15) bonded respectively to the surface on the positive electrode side and to the surface on the negative electrode side of the semiconductor element; a heat sink plate (11) disposed as intersecting a junction interface between the semiconductor element and each of the multiple conductors and configured to discharge heat of the semiconductor element; and an insulator (12) bonding the heat sink plate to the multiple conductors. The insulator includes a heat conductive insulator (16) disposed inside a portion facing all of the multiple conductors and a flexible insulator (17) disposed at a portion other than the heat conductive insulator.Type: ApplicationFiled: February 1, 2007Publication date: September 24, 2009Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hiroki Sekiya, Toshiharu Oobu, Ryuichi Morikawa, Gou Ninomiya, Hiroyuki Hiramoto