Patents by Inventor Norihito Kawaguchi
Norihito Kawaguchi 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: 11482868Abstract: A secondary battery protection circuit for a secondary battery includes: a reference voltage circuit configured to generate a reference voltage by using a depletion-type transistor and a transistor unit of enhancement type connected in series with the depletion-type transistor; a voltage divider configured to output a detection voltage obtained by dividing a power source voltage of the secondary battery; a detection circuit configured to detect an abnormal state of the secondary battery based on the reference voltage and the detection voltage; a first adjustment circuit configured to adjust a size ratio of the depletion-type transistor to the transistor unit based on threshold voltages of the depletion-type transistor and the transistor unit; and a second adjustment circuit configured to adjust the detection voltage based on the reference voltage after adjusting the size ratio.Type: GrantFiled: July 12, 2019Date of Patent: October 25, 2022Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Daichi Yamashita, Norihito Kawaguchi, Yoshihiro Satake, Nobuhito Tanaka, Koji Koshimizu
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Publication number: 20200091742Abstract: A secondary battery protection circuit for a secondary battery includes: a reference voltage circuit configured to generate a reference voltage by using a depletion-type transistor and a transistor unit of enhancement type connected in series with the depletion-type transistor; a voltage divider configured to output a detection voltage obtained by dividing a power source voltage of the secondary battery; a detection circuit configured to detect an abnormal state of the secondary battery based on the reference voltage and the detection voltage; a first adjustment circuit configured to adjust a size ratio of the depletion-type transistor to the transistor unit based on threshold voltages of the depletion-type transistor and the transistor unit; and a second adjustment circuit configured to adjust the detection voltage based on the reference voltage after adjusting the size ratio.Type: ApplicationFiled: July 12, 2019Publication date: March 19, 2020Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Daichi YAMASHITA, Norihito KAWAGUCHI, Yoshihiro SATAKE, Nobuhito TANAKA, Koji KOSHIMIZU
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Patent number: 10170919Abstract: A battery protecting apparatus includes: a charging/discharging control chip including a charging control FET and a discharging control FET connected to a secondary battery; a protecting chip configured to control, based on a voltage between both ends of the secondary battery, the FETs to prevent overcharging, over discharging, and an overcurrent; and a lead frame having a connection surface for a plurality of external terminals and another surface in conduction with the connection surface. Said another surface is electrically connected, via a conductive material, to terminals of the FETs formed on a front surface of the charging/discharging control chip. A back surface of the protecting chip faces a back surface of the charging/discharging control chip via an insulative member. Terminals of the protecting chip are electrically connected to said another surface through bonding wires. The charging/discharging control chip and the protecting chip are covered by a resin.Type: GrantFiled: June 14, 2017Date of Patent: January 1, 2019Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Nobuhito Tanaka, Yoshihiro Satake, Norihito Kawaguchi, Koji Koshimizu, Kaoru Usui, Yusuke Ohba
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Publication number: 20180048167Abstract: A battery protecting apparatus includes: a charging/discharging control chip including a charging control FET and a discharging control FET connected to a secondary battery; a protecting chip configured to control, based on a voltage between both ends of the secondary battery, the FETs to prevent overcharging, over discharging, and an overcurrent; and a lead frame having a connection surface for a plurality of external terminals and another surface in conduction with the connection surface. Said another surface is electrically connected, via a conductive material, to terminals of the FETs formed on a front surface of the charging/discharging control chip. A back surface of the protecting chip faces a back surface of the charging/discharging control chip via an insulative member. Terminals of the protecting chip are electrically connected to said another surface through bonding wires. The charging/discharging control chip and the protecting chip are covered by a resin.Type: ApplicationFiled: June 14, 2017Publication date: February 15, 2018Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Nobuhito TANAKA, Yoshihiro SATAKE, Norihito KAWAGUCHI, Koji KOSHIMIZU, Kaoru USUI, Yusuke OHBA
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Patent number: 9812887Abstract: A secondary-battery monitoring device capable of realizing highly reliable overcurrent detection and a battery pack having it are provided. When an overcurrent flowing to a secondary battery is to be detected by utilizing a current detection voltage generated via on-resistance of a discharge-control switch and a charge-control switch, a voltage correction circuit that generates a correction voltage having a characteristic varied by positive slope or negative slope along with increase in a power supply voltage is provided, and the correction voltage is added to the detection voltage or a reference power supply voltage with the polarity that cancels out the slope of voltage variation caused in the detection voltage, and then the voltage is input to a comparator circuit. In this manner, variation in the overcurrent determination current is reduced.Type: GrantFiled: February 12, 2016Date of Patent: November 7, 2017Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Shogo Nagata, Yasuaki So, Takeshi Yamaguchi, Norihito Kawaguchi
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Patent number: 9755442Abstract: A battery protection IC has detection circuits to detect faults of an overcharge, an over-discharge, and an overcurrent of a secondary battery; a control circuit to protect the secondary battery, by controlling (dis)charging the secondary battery upon the fault; and a delay circuit to generate delay after the fault before the controlling. The IC includes a memory unit to store data for setting and adjusting a circuit characteristic of the IC; and a setting circuit to set and adjust the circuit characteristic, based on the data from the memory unit. The memory unit includes a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit directly cross-coupled with the memory cells, for each bit of the data. The latch circuit statically outputs the data from the memory cells to the setting circuit when the IC is turned on.Type: GrantFiled: November 30, 2015Date of Patent: September 5, 2017Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Ryota Kageyama, Tsutomu Yamauchi, Nobuhito Tanaka, Takashi Takeda, Yoshihiro Satake, Takeshi Yamaguchi, Koji Koshimizu, Norihito Kawaguchi
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Patent number: 9680299Abstract: A battery protection integrated circuit includes a switch unit; a control unit that controls on and off of the switch unit based on a monitored result; a package; a plurality of external connection terminals that are electrically connected to a plurality of terminal portions of the switch unit and the control unit, respectively, all of the external connection terminals that are to be connected to a first terminal of a circuit board being provided at a first short side of the terminal providing surface that faces one of board short sides of a circuit board, and all of the external connection terminals that are to be connected to a second terminal of the circuit board being provided at a second short side that is opposite to the first short side, when being mounted on the circuit board.Type: GrantFiled: September 18, 2015Date of Patent: June 13, 2017Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Nobuhito Tanaka, Norihito Kawaguchi
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Patent number: 9553469Abstract: There is provided a method of correcting an overcurrent detection voltage of a battery protection integrated circuit including a current path between a first terminal and a second terminal, one or more transistors for controlling current of a secondary battery, an overcurrent detection circuit and a control circuit.Type: GrantFiled: September 25, 2015Date of Patent: January 24, 2017Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Ryota Kageyama, Tsutomu Yamauchi, Norihito Kawaguchi, Nobuhito Tanaka, Takashi Takeda, Yoshihiro Satake, Takeshi Yamaguchi, Koji Koshimizu
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Publication number: 20160372954Abstract: There is provided a method of correcting an overcurrent detection voltage of a battery protection integrated circuit including a current path between a first terminal and a second terminal, one or more transistors for controlling current of a secondary battery, an overcurrent detection circuit and a control circuit.Type: ApplicationFiled: September 25, 2015Publication date: December 22, 2016Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Ryota KAGEYAMA, Tsutomu YAMAUCHI, Norihito KAWAGUCHI, Nobuhito TANAKA, Takashi TAKEDA, Yoshihiro SATAKE, Takeshi YAMAGUCHI, Koji KOSHIMIZU
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Publication number: 20160372945Abstract: A battery protection IC has detection circuits to detect faults of an overcharge, an over-discharge, and an overcurrent of a secondary battery; a control circuit to protect the secondary battery, by controlling (dis)charging the secondary battery upon the fault; and a delay circuit to generate delay after the fault before the controlling. The IC includes a memory unit to store data for setting and adjusting a circuit characteristic of the IC; and a setting circuit to set and adjust the circuit characteristic, based on the data from the memory unit. The memory unit includes a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit directly cross-coupled with the memory cells, for each bit of the data. The latch circuit statically outputs the data from the memory cells to the setting circuit when the IC is turned on.Type: ApplicationFiled: November 30, 2015Publication date: December 22, 2016Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Ryota KAGEYAMA, Tsutomu YAMAUCHI, Nobuhito TANAKA, Takashi TAKEDA, Yoshihiro SATAKE, Takeshi YAMAGUCHI, Koji KOSHIMIZU, Norihito KAWAGUCHI
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Publication number: 20160359321Abstract: A battery protection integrated circuit includes a switch unit; a control unit that controls on and off of the switch unit based on a monitored result; a package; a plurality of external connection terminals that are electrically connected to a plurality of terminal portions of the switch unit and the control unit, respectively, all of the external connection terminals that are to be connected to a first terminal of a circuit board being provided at a first short side of the terminal providing surface that faces one of board short sides of a circuit board, and all of the external connection terminals that are to be connected to a second terminal of the circuit board being provided at a second short side that is opposite to the first short side, when being mounted on the circuit board.Type: ApplicationFiled: September 18, 2015Publication date: December 8, 2016Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Nobuhito TANAKA, Norihito KAWAGUCHI
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Publication number: 20160164311Abstract: A secondary-battery monitoring device capable of realizing highly reliable overcurrent detection and a battery pack having it are provided. When an overcurrent flowing to a secondary battery is to be detected by utilizing a current detection voltage generated via on-resistance of a discharge-control switch and a charge-control switch, a voltage correction circuit that generates a correction voltage having a characteristic varied by positive slope or negative slope along with increase in a power supply voltage is provided, and the correction voltage is added to the detection voltage or a reference power supply voltage with the polarity that cancels out the slope of voltage variation caused in the detection voltage, and then the voltage is input to a comparator circuit. In this manner, variation in the overcurrent determination current is reduced.Type: ApplicationFiled: February 12, 2016Publication date: June 9, 2016Inventors: Shogo Nagata, Yasuaki So, Takeshi Yamaguchi, Norihito Kawaguchi
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Patent number: 9312723Abstract: A secondary-battery monitoring device capable of realizing highly reliable overcurrent detection and a battery pack having it are provided. When an overcurrent flowing to a secondary battery is to be detected by utilizing a current detection voltage generated via on-resistance of a discharge-control switch and a charge-control switch, a voltage correction circuit that generates a correction voltage having a characteristic varied by positive slope or negative slope along with increase in a power supply voltage is provided, and the correction voltage is added to the detection voltage or a reference power supply voltage with the polarity that cancels out the slope of voltage variation caused in the detection voltage, and then the voltage is input to a comparator circuit. In this manner, variation in the overcurrent determination current is reduced.Type: GrantFiled: February 2, 2013Date of Patent: April 12, 2016Assignee: Mitsumi Electric Co., Ltd.Inventors: Shogo Nagata, Yasuaki So, Takeshi Yamaguchi, Norihito Kawaguchi
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Publication number: 20150348781Abstract: A laser annealing method for executing laser annealing by irradiating a semiconductor film formed on a surface of a substrate with a laser beam, the method including the steps of, generating a linearly polarized rectangular laser beam whose cross section perpendicular to an advancing direction is a rectangle with an electric field directed toward a long-side direction of the rectangle or an elliptically polarized rectangular laser beam having a major axis directed toward a long-side direction, causing the rectangular laser beam to be introduced to the surface of the substrate, and setting a wavelength of the rectangular laser beam to a length which is about a desired size of a crystal grain in a standing wave direction.Type: ApplicationFiled: June 8, 2015Publication date: December 3, 2015Inventors: Ryusuke KAWAKAMI, Kenichiro NISHIDA, Norihito KAWAGUCHI, Miyuki MASAKI, Atsushi YOSHINOUCHI
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Publication number: 20150340707Abstract: The disclosure relates to an oxygen reduction catalyst, an oxygen reduction electrode, and a fuel cell each of which has a carbon nanowall doped with nitrogen. According to the disclosure, the oxygen reduction catalyst, the oxygen reduction electrode and the fuel cell can be provided at low cost.Type: ApplicationFiled: August 5, 2015Publication date: November 26, 2015Applicants: IHI Corporation, Public University Corporation Yokohama City UniversityInventors: Akihiko YOSHIMURA, Takahiro MATSUO, Norihito KAWAGUCHI, Kumiko YOSHIHISA, Masaru TACHIBANA, Seog Chu SHIN
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Publication number: 20150246840Abstract: Provided is a workpiece cutting method of cutting a workpiece in which a reinforcement layer to which compression stress is applied is stacked on a surface of a non-reinforcement layer in a thickness direction of the workpiece, the workpiece cutting method including a process of continuously heating the surface of the reinforcement layer in a direction perpendicular to the thickness direction and transferring heat to the reinforcement layer and the non-reinforcement layer; and a process of injecting a cooling medium to a surface of the workpiece after heating, and generating thermal stress equal to or larger than breaking stress of the non-reinforcement layer in a boundary portion of the non-reinforcement layer with respect to the reinforcement layer. According to the workpiece cutting method, the workpiece can be rapidly cut, and deterioration of quality of the cutting portion can be suppressed.Type: ApplicationFiled: May 15, 2015Publication date: September 3, 2015Applicant: IHI CorporationInventors: Norihito KAWAGUCHI, Junichi YAMADA, Tomoo KUSUMI, Toshiaki SAITO
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Patent number: 9058994Abstract: A laser annealing method for executing laser annealing by irradiating a semiconductor film formed on a surface of a substrate with a laser beam, the method including the steps of, generating a linearly polarized rectangular laser beam whose cross section perpendicular to an advancing direction is a rectangle with an electric field directed toward a long-side direction of the rectangle or an elliptically polarized rectangular laser beam having a major axis directed toward a long-side direction, causing the rectangular laser beam to be introduced to the surface of the substrate, and setting a wavelength of the rectangular laser beam to a length which is about a desired size of a crystal grain in a standing wave direction.Type: GrantFiled: December 23, 2013Date of Patent: June 16, 2015Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Ryusuke Kawakami, Kenichirou Nishida, Norihito Kawaguchi, Miyuki Masaki, Atsushi Yoshinouchi
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Publication number: 20140213071Abstract: A laser annealing method for executing laser annealing by irradiating a semiconductor film formed on a surface of a substrate with a laser beam, the method including the steps of, generating a linearly polarized rectangular laser beam whose cross section perpendicular to an advancing direction is a rectangle with an electric field directed toward a long-side direction of the rectangle or an elliptically polarized rectangular laser beam having a major axis directed toward a long-side direction, causing the rectangular laser beam to be introduced to the surface of the substrate, and setting a wavelength of the rectangular laser beam to a length which is about a desired size of a crystal grain in a standing wave direction.Type: ApplicationFiled: December 23, 2013Publication date: July 31, 2014Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Ryusuke KAWAKAMI, Kenichirou NISHIDA, Norihito KAWAGUCHI, Miyuki MASAKI, Atsushi YOSHINOUCHI
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Publication number: 20140113797Abstract: A device for cutting a brittle member such as a glass is comprised of a laser oscillator configured to radiate a laser beam through a first space onto a first region on the brittle member; a cooling nozzle configured to expel a cooling medium onto a second region distinct from the first region on the brittle member; a baffle so disposed as to leave a gap between the member and the baffle and to have the first region not enclosed by the baffle, and so directed as to deflect a flow of a splash and a mist originating in the second region away from the first region; and a gas nozzle configured to expel a gas toward the gap.Type: ApplicationFiled: December 24, 2013Publication date: April 24, 2014Applicant: IHI CorporationInventors: Junichi YAMADA, Norihito Kawaguchi, Yoshiyuki Wada, Tomoo Kusumi, Noriaki Hasegawa, Yuichiro Nakayama, Toshiaki Saitou
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Patent number: 8629522Abstract: A laser annealing method for executing laser annealing by irradiating a semiconductor film formed on a surface of a substrate with a laser beam, the method including the steps of, generating a linearly polarized rectangular laser beam whose cross section perpendicular to an advancing direction is a rectangle with an electric field directed toward a long-side direction of the rectangle or an elliptically polarized rectangular laser beam having a major axis directed toward a long-side direction, causing the rectangular laser beam to be introduced to the surface of the substrate, and setting a wavelength of the rectangular laser beam to a length which is about a desired size of a crystal grain in a standing wave direction.Type: GrantFiled: September 10, 2012Date of Patent: January 14, 2014Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Ryusuke Kawakami, Kenichirou Nishida, Norihito Kawaguchi, Miyuki Masaki, Atsushi Yoshinouchi