Patents by Inventor Yohsuke Mitani

Yohsuke Mitani 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).

  • Publication number: 20220255343
    Abstract: A backup power-supply system according to the present invention includes a detector, a power storage unit, and a controller. The detector is configured to detect an abnormality of a power supply that supplies electric power to loads. The power storage unit is configured to supply electric power to the loads when the detector detects the abnormality of the power supply. The controller is configured to monitor a remaining electric energy remaining in the power storage unit, and impose, when the remaining electric energy of the power storage unit is smaller than a threshold electric energy, a limitation on the loads to which the power storage unit supplies the electric power.
    Type: Application
    Filed: July 28, 2020
    Publication date: August 11, 2022
    Inventors: YOHSUKE MITANI, TAKESHI UMEDA
  • Patent number: 11309586
    Abstract: A discharge circuit includes a plurality of burden circuits that are electrically connected in parallel to a plurality of power storage units, respectively. Each of the plurality of burden circuits includes (i) a resistor and a switch that are electrically connected in series between both ends of a corresponding one of the plurality of power storage units, and (ii) a control terminal that controls the switch according to a potential of the control terminal. The plurality of burden circuits are electrically connected in series between a positive electrode and a negative electrode. The control terminal of a n+1-th burden circuit from a reference point is electrically connected, via the switch of the n-th burden circuit from the reference point, to a reference point side terminal of a n-th power storage unit from the reference point. The reference point is the positive electrode or the negative electrode.
    Type: Grant
    Filed: September 3, 2020
    Date of Patent: April 19, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hiroaki Tsukamoto, Yohsuke Mitani, Takahiro Kudo, Yoshimitsu Odajima
  • Patent number: 11251647
    Abstract: The present disclosure relates to a vehicle electricity storage device capable of maintaining proper backup of a main power supply. The vehicle electricity storage device includes an electricity storage circuit, a main charge circuit, and a precharge circuit. The electricity storage circuit configured to supply stored electricity to a load. The main charge circuit operates to supply electricity of a main power supply to the electricity storage circuit when an ignition switch is in an ON state of allowing an engine to start. The precharge circuit operates to supply electricity of the main power supply to the electricity storage circuit when the main charge circuit is in a state of stopping operation by the ignition switch being turned off.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: February 15, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takahiro Kudo, Yohsuke Mitani, Yoshimitsu Odajima
  • Patent number: 11251636
    Abstract: A power storage device includes an input terminal, an output terminal, a first circuit, and a second circuit. The input terminal is to be electrically connected to a power supply. The output terminal is to be electrically connected to a load. The first circuit and the second circuit are electrically connected in parallel. Each of the first circuit and the second circuit are disposed between the input terminal and the output terminal. The first circuit includes a power storage unit and a discharge path that allows a discharge current from the power storage unit to flow toward the output terminal. The second circuit includes a blocking path that prevents the discharge current from flowing toward the input terminal.
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: February 15, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hiroaki Tsukamoto, Yohsuke Mitani, Takahiro Kudo, Yoshimitsu Odajima
  • Publication number: 20210021148
    Abstract: A method for controlling a discharge of a power storage device includes: a first step of discharging, in a first section of a discharging period, a part of an electric charge stored in a power storage through a first discharge path and a second discharge path of a discharge circuit; and a second step of discharging, in a second section of the discharging period, a remaining part of the electric charge through the second discharge path. The first discharge path includes a zener diode connected to one end of the power storage. The second discharge path includes a first transistor connected to the one end of the power storage. The first section is a period in which a voltage of the one end of the power storage is higher than a breakdown voltage of the zener diode. The second section is a period in which a voltage of the one end of the power storage is lower than the breakdown voltage of the zener diode.
    Type: Application
    Filed: October 1, 2020
    Publication date: January 21, 2021
    Inventors: Takahiro KUDO, Yoshimitsu ODAJIMA, Yohsuke MITANI
  • Publication number: 20200403277
    Abstract: A discharge circuit includes a plurality of burden circuits that are electrically connected in parallel to a plurality of power storage units, respectively. Each of the plurality of burden circuits includes (i) a resistor and a switch that are electrically connected in series between both ends of a corresponding one of the plurality of power storage units, and (ii) a control terminal that controls the switch according to a potential of the control terminal. The plurality of burden circuits are electrically connected in series between a positive electrode and a negative electrode. The control terminal of a n+1-th burden circuit from a reference point is electrically connected, via the switch of the n-th burden circuit from the reference point, to a reference point side terminal of a n-th power storage unit from the reference point. The reference point is the positive electrode or the negative electrode.
    Type: Application
    Filed: September 3, 2020
    Publication date: December 24, 2020
    Inventors: HIROAKI TSUKAMOTO, YOHSUKE MITANI, TAKAHIRO KUDO, YOSHIMITSU ODAJIMA
  • Patent number: 10833527
    Abstract: A discharge circuit includes: a first transistor connected to power storage; an operational amplifier for controlling an output current of the first transistor; and the current mirror circuit connected to the operational amplifier. The current mirror circuit includes a second transistor connected to a non-inverting input terminal of the operational amplifier, and a third transistor connected to the power storage.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: November 10, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takahiro Kudo, Yoshimitsu Odajima, Yohsuke Mitani
  • Publication number: 20200335991
    Abstract: A power storage device includes an input terminal, an output terminal, a first circuit, and a second circuit. The input terminal is to be electrically connected to a power supply. The output terminal is to be electrically connected to a load. The first circuit and the second circuit are electrically connected in parallel. Each of the first circuit and the second circuit are disposed between the input terminal and the output terminal. The first circuit includes a power storage unit and a discharge path that allows a discharge current from the power storage unit to flow toward the output terminal. The second circuit includes a blocking path that prevents the discharge current from flowing toward the input terminal.
    Type: Application
    Filed: July 2, 2020
    Publication date: October 22, 2020
    Inventors: HIROAKI TSUKAMOTO, YOHSUKE MITANI, TAKAHIRO KUDO, YOSHIMITSU ODAJIMA
  • Publication number: 20200010070
    Abstract: A vehicle electricity storage device includes a capacitor unit for supplying stored electric power to an electronically controlled system, and a microcomputer including a memory. The memory stores a plurality of thresholds (internal resistance limit values) different from each other. Each of the plurality of thresholds is to be compared with an electrical characteristic value (internal resistance value) related to the capacitor unit for determining a deterioration state of the capacitor unit. The each of the plurality of thresholds is stored in association with an identification ID for identifying the electronically controlled system. The microcomputer acquires the identification ID from the electronically controlled system. And the microcomputer selects, from the plurality of thresholds, a threshold associated with the identification ID acquired. Then the microcomputer determines the deterioration state of the capacitor unit by using the electrical characteristic value and the threshold selected.
    Type: Application
    Filed: August 28, 2017
    Publication date: January 9, 2020
    Inventors: TAKESHI UMEDA, YOHSUKE MITANI
  • Patent number: 10529499
    Abstract: An electricity storage unit of the present disclosure includes: an electricity storage device; a holder for holding this electricity storage device; a case having a tubular side wall part and a bottom surface part closing one end of the side wall part, the case being formed with an opening at another end of the side wall part; and a cover for covering the opening. The electricity storage device and the holder are housed inside the case. At least a part of the cover is inserted inside the case. An aperture is formed at least part of a region between an outer periphery of the cover and an inner surface of the side wall part.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: January 7, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kiyoshi Wakinaka, Yohsuke Mitani, Kazuki Morita
  • Publication number: 20190173311
    Abstract: The present disclosure relates to a vehicle electricity storage device capable of maintaining proper backup of a main power supply. The vehicle electricity storage device includes an electricity storage circuit, a main charge circuit, and a precharge circuit. The electricity storage circuit configured to supply stored electricity to a load. The main charge circuit operates to supply electricity of a main power supply to the electricity storage circuit when an ignition switch is in an ON state of allowing an engine to start. The precharge circuit operates to supply electricity of the main power supply to the electricity storage circuit when the main charge circuit is in a state of stopping operation by the ignition switch being turned off.
    Type: Application
    Filed: August 30, 2017
    Publication date: June 6, 2019
    Inventors: TAKAHIRO KUDO, YOHSUKE MITANI, YOSHIMITSU ODAJIMA
  • Publication number: 20190139712
    Abstract: An electricity storage unit of the present disclosure includes: an electricity storage device; a holder for holding this electricity storage device; a case having a tubular side wall part and a bottom surface part closing one end of the side wall part, the case being formed with an opening at another end of the side wall part; and a cover for covering the opening. The electricity storage device and the holder are housed inside the case. At least a part of the cover is inserted inside the case. An aperture is formed at least part of a region between an outer periphery of the cover and an inner surface of the side wall part.
    Type: Application
    Filed: December 18, 2018
    Publication date: May 9, 2019
    Inventors: Kiyoshi WAKINAKA, Yohsuke MITANI, Kazuki MORITA
  • Patent number: 10192691
    Abstract: An electricity storage unit of the present disclosure includes: electricity storage device; holder for holding this electricity storage device; bottomed tubular case for housing electricity storage device and holder; and cover for covering opening of case. At least a part of cover is inserted into case. With this configuration, since a surface on which a joint between cover and case is formed can be disposed on an opening side of case, it is possible to suppress intrusion of a foreign substance, such as a water droplet.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: January 29, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kiyoshi Wakinaka, Yohsuke Mitani, Kazuki Morita
  • Publication number: 20180366973
    Abstract: A discharge circuit includes: a first transistor connected to power storage; an operational amplifier for controlling an output current of the first transistor; and the current mirror circuit connected to the operational amplifier. The current mirror circuit includes a second transistor connected to a non-inverting input terminal of the operational amplifier, and a third transistor connected to the power storage.
    Type: Application
    Filed: August 28, 2018
    Publication date: December 20, 2018
    Inventors: TAKAHIRO KUDO, YOSHIMITSU ODAJIMA, YOHSUKE MITANI
  • Patent number: 10029572
    Abstract: A hybrid power source connects a secondary battery and an EDLC. A first switch connects the hybrid power source and a lead acid battery in parallel. A power source controlling portion controls power supply to the hybrid power source and the lead acid battery. The hybrid power source is connected to a starter for starting an engine for a vehicle, and also connected to an electric device except for the starter through the first switch, and the lead acid battery is connected to the electric device, and also connected to the starter through the first switch.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: July 24, 2018
    Assignees: SANYO ELECTRIC CO., LTD., PANASONIC CORPORATION
    Inventors: Toshihiro Sakatani, Hiromasa Sugii, Makoto Ochi, Kazuki Morita, Takumi Yamaguchi, Yohsuke Mitani
  • Publication number: 20170278645
    Abstract: An electricity storage unit of the present disclosure includes: electricity storage device; holder for holding this electricity storage device; bottomed tubular case for housing electricity storage device and holder; and cover for covering opening of case. At least a part of cover is inserted into case. With this configuration, since a surface on which a joint between cover and case is formed can be disposed on an opening side of case, it is possible to suppress intrusion of a foreign substance, such as a water droplet.
    Type: Application
    Filed: June 14, 2017
    Publication date: September 28, 2017
    Inventors: KIYOSHI WAKINAKA, YOHSUKE MITANI, KAZUKI MORITA
  • Publication number: 20170106758
    Abstract: A hybrid power source connects a secondary battery and an EDLC. A first switch connects the hybrid power source and a lead acid battery in parallel. A power source controlling portion controls power supply to the hybrid power source and the lead acid battery. The hybrid power source is connected to a starter for starting an engine for a vehicle, and also connected to an electric device except for the starter through the first switch, and the lead acid battery is connected to the electric device, and also connected to the starter through the first switch.
    Type: Application
    Filed: October 20, 2015
    Publication date: April 20, 2017
    Inventors: Toshihiro SAKATANI, Hiromasa SUGII, Makoto OCHI, Kazuki MORITA, Takumi YAMAGUCHI, Yohsuke MITANI
  • Patent number: 8305035
    Abstract: In an energy storage device, a charging circuit is electrically coupled to the energy storage section. A first comparator is electrically coupled to an energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches first predetermined voltage Vc1. A second comparator is electrically coupled to the energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches second predetermined voltage Vc2. A control circuit is electrically coupled to the first comparator and the second comparator. The control circuit obtains period tm from inversion of the output of the first comparator to the output of the second comparator. Capacitance C of the energy storage section is calculated based on this period tm and voltage change width ?Vc between the first predetermined voltage Vc1 and the second predetermined voltage Vc2.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: November 6, 2012
    Assignee: Panasonic Corporation
    Inventors: Kazuki Morita, Yohsuke Mitani
  • Publication number: 20110115427
    Abstract: In an energy storage device, a charging circuit is electrically coupled to the energy storage section. A first comparator is electrically coupled to an energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches first predetermined voltage Vc1. A second comparator is electrically coupled to the energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches second predetermined voltage Vc2. A control circuit is electrically coupled to the first comparator and the second comparator. The control circuit obtains period tm from inversion of the output of the first comparator to the output of the second comparator. Capacitance C of the energy storage section is calculated based on this period tm and voltage change width ?Vc between the first predetermined voltage Vc1 and the second predetermined voltage Vc2.
    Type: Application
    Filed: August 23, 2010
    Publication date: May 19, 2011
    Applicant: Panasonic Corporation
    Inventors: Kazuki Morita, Yohsuke Mitani
  • Patent number: 7872447
    Abstract: In an electrical storage apparatus including an electric storage device connected between a main power supply and a load, a first bypass FET and a bypass diode which are connected in series between the main power supply and the load are provided, and first and second main path FETs connected in series between the electric storage device and the load are provided. A controller judges that the first bypass FET suffers an open-circuit failure if the voltage (Va) of the load is equal to or smaller than the first threshold value Vth1 or if the voltage (Vc) at the connection point between the first bypass FET and the bypass diode is equal to or smaller than the second threshold value Vth2, when the first bypass FET is turned on and the first main path FET and the second main path FET are turned off.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: January 18, 2011
    Assignee: Panasonic Corporation
    Inventors: Kazuki Morita, Hideaki Hamai, Yohsuke Mitani