Patents by Inventor Yu KAWAI

Yu KAWAI 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: 20220181990
    Abstract: A first leg includes a first switch circuit disposed between a first node to which a positive electrode of a DC power supply is connected and a second node and a second switch circuit disposed between the second node and a third node. A first filter circuit includes a first capacitor. A bridge circuit includes a second leg and a third leg that are disposed in parallel between the first node and the third node. A clamp circuit includes a bidirectional switch disposed between a fourth node that is a midpoint of the second leg and a fifth node that is a midpoint of the third leg. A second filter circuit includes a first reactor and a second reactor.
    Type: Application
    Filed: July 4, 2019
    Publication date: June 9, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi AMIMOTO, Yu KAWAI
  • Patent number: 11356038
    Abstract: When an inverter and a converter are merely operated with their carrier waves synchronized with each other, current ripple of a smoothing capacitor connected therebetween might be increased. Accordingly, bipolar modulation PWM control is performed on the inverter, PWM control is performed on the converter, and the phase of the carrier wave for the inverter or the converter is shifted on the basis of AC output, whereby timings of currents flowing into the smoothing capacitor are made different from each other.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: June 7, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takeshi Amimoto, Yu Kawai
  • Patent number: 11228247
    Abstract: A parallel power supply device according to the present invention includes: a plurality of DC/DC converters connected in parallel to perform power conversion between a DC power supply and a common load; a voltage detector to detect a voltage of the common load; and a plurality of control circuits each to control a corresponding one of the plurality of DC/DC converters, wherein during parallel operation of the plurality of DC/DC converters, the plurality of control circuits control the plurality of DC/DC converters by proportional control using a same target voltage value and a same proportional gain, based on a voltage value of the common load detected by the voltage detector. Therefore, in the parallel power supply device in which the plurality of DC/DC converters are connected in parallel, the individual DC/DC converters can supply electric power to the load independently and equally.
    Type: Grant
    Filed: November 24, 2017
    Date of Patent: January 18, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yusuke Higaki, Hidehito Yoshida, Yu Kawai, Takahiro Kato
  • Publication number: 20220014115
    Abstract: When an inverter and a converter are merely operated with their carrier waves synchronized with each other, current ripple of a smoothing capacitor connected therebetween might be increased. Accordingly, bipolar modulation PWM control is performed on the inverter, PWM control is performed on the converter, and the phase of the carrier wave for the inverter or the converter is shifted on the basis of AC output, whereby timings of currents flowing into the smoothing capacitor are made different from each other.
    Type: Application
    Filed: January 28, 2019
    Publication date: January 13, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi AMIMOTO, Yu KAWAI
  • Patent number: 11153460
    Abstract: There is provided a control method of an information processing apparatus that can execute authentication processing with a communication apparatus by authentication schemes. The method includes: performing display control to cause a display unit to display a guide for performing the authentication processing with the communication apparatus in accordance with one of the authentication schemes when the information processing apparatus has obtained information from the communication apparatus; and executing the authentication processing in accordance with an operation performed by a user after the guide is displayed. In the performing the display control, a different guide is displayed in accordance with contents of the obtained information, and in the executing, the authentication processing is executed in accordance with an authentication scheme, which differs in accordance with the contents of the obtained information and corresponds to the displayed guide.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: October 19, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yu Kawai
  • Publication number: 20210281159
    Abstract: A PWM control unit generates signals for controlling switching elements in respective legs based on the magnitude relationship between individual Duty commands for the respective legs and triangular wave carriers having different initial phases and having a common cycle, a current estimation unit acquires detected values from a current detector at a sampling cycle different from the carrier cycle and estimates the phase currents, and a current control unit adjusts Duty commands so that the estimated phase currents coincide with target values for the phase currents.
    Type: Application
    Filed: September 28, 2018
    Publication date: September 9, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventor: Yu KAWAI
  • Patent number: 10992240
    Abstract: A power conversion device which reduces switching losses and stabilizes the output power. A switching-mode changer generates a reference signal for switching a mode of operation of the full-bridge circuit to a first switching mode or a second switching mode. In the first switching mode, an upper arm and a lower arm are switched synchronously, and a lower arm and an upper arm are non-conducting. In the second switching mode, the lower arm and the upper arm are switched synchronously, and the upper arm and the lower arm are non-conducting. The switching-mode changer adjusts the phase of the reference signal so that the reactive power is reduced.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: April 27, 2021
    Assignees: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of Technology
    Inventors: Yu Kawai, Tatsuya Okuda, Jun-ichi Itoh, Hoai Nam Le
  • Patent number: 10848065
    Abstract: A power conversion device is configured with a plurality of power conversion units multiplexed in parallel each having a power converter for converting a power between a power source and a common load. At least one of the power conversion units is provided with an operation manager for managing the operation of the power converter. The operation manager changes the proportional gain of a voltage adjuster that performs a proportional control by inputting the steady-state offset between a target voltage and a voltage to the load, to determine, by comparing a change in the steady-state offset with a change in the proportional gain, whether the at least one power conversion unit is in a single operation in which the other power conversion units are in no operation.
    Type: Grant
    Filed: February 16, 2018
    Date of Patent: November 24, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yu Kawai, Takahiro Kato
  • Publication number: 20200295674
    Abstract: A power conversion device which reduces switching losses and stabilizes the output power. A switching-mode changer generates a reference signal for switching a mode of operation of the full-bridge circuit to a first switching mode or a second switching mode. In the first switching mode, an upper arm and a lower arm are switched synchronously, and a lower arm and an upper arm are non-conducting. In the second switching mode, the lower arm and the upper arm are switched synchronously, and the upper arm and the lower arm are non-conducting. The switching-mode changer adjusts the phase of the reference signal so that the reactive power is reduced.
    Type: Application
    Filed: September 20, 2018
    Publication date: September 17, 2020
    Applicants: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of Technology
    Inventors: Yu KAWAI, Tatsuya OKUDA, Jun-ichi ITOH, Hoai Nam LE
  • Patent number: 10752461
    Abstract: A line member connection device which applies an adhesive tape includes: a supply reel which supplies the adhesive tape; a cutter which cuts the adhesive tape drawn from the supply reel; and an intermediate roller via which the adhesive tape drawn from the supply reel is directed to the cutter, the intermediate roller being disposed between the supply reel and the cutter, wherein in cross section taken along a rotation axis of the intermediate roller, a surface of the first roller which supports the adhesive tape is shaped to have a straight section parallel to the rotation axis, and a first inclined section inclined relative to the rotation axis.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: August 25, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kazumichi Shimizu, Yoshihiro Owaki, Masaki Yoshida, Akihiro Yamamoto, Yu Kawai
  • Publication number: 20200259418
    Abstract: A parallel power supply device according to the present invention includes: a plurality of DC/DC converters connected in parallel to perform power conversion between a DC power supply and a common load; a voltage detector to detect a voltage of the common load; and a plurality of control circuits each to control a corresponding one of the plurality of DC/DC converters, wherein during parallel operation of the plurality of DC/DC converters, the plurality of control circuits control the plurality of DC/DC converters by proportional control using a same target voltage value and a same proportional gain, based on a voltage value of the common load detected by the voltage detector. Therefore, in the parallel power supply device in which the plurality of DC/DC converters are connected in parallel, the individual DC/DC converters can supply electric power to the load independently and equally.
    Type: Application
    Filed: November 24, 2017
    Publication date: August 13, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yusuke HIGAKI, Hidehito YOSHIDA, Yu KAWAI, Takahiro KATO
  • Patent number: 10644504
    Abstract: In an electrical power conversion apparatus including DC power sources, electric power converter units, and an electric power sharing regulator for regulating electric power on a basis of individual electric power converter units, when the plurality of electric power converter units connects thereto a plurality of DC power sources on their input sides, and is connected in parallel with one another on their output sides, three threshold values of rated electric power, electric power of the highest efficiency, and electric power of allowable efficiency receive attention from an efficiency characteristic of each of the electric power converter units, and the adjustment of electric power shared by each of the electric power converter units is performed by the electric power sharing regulator so that better efficiency is achieved when the apparatus is viewed in its entirety.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: May 5, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventor: Yu Kawai
  • Publication number: 20200099305
    Abstract: A power conversion device is configured with a plurality of power conversion units multiplexed in parallel each having a power converter for converting a power between a power source and a common load. At least one of the power conversion units is provided with an operation manager for managing the operation of the power converter. The operation manager changes the proportional gain of a voltage adjuster that performs a proportional control by inputting the steady-state offset between a target voltage and a voltage to the load, to determine, by comparing a change in the steady-state offset with a change in the proportional gain, whether the at least one power conversion unit is in a single operation in which the other power conversion units are in no operation.
    Type: Application
    Filed: February 16, 2018
    Publication date: March 26, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yu KAWAI, Takahiro KATO
  • Publication number: 20190387128
    Abstract: There is provided a control method of an information processing apparatus that can execute authentication processing with a communication apparatus by authentication schemes. The method includes: performing display control to cause a display unit to display a guide for performing the authentication processing with the communication apparatus in accordance with one of the authentication schemes when the information processing apparatus has obtained information from the communication apparatus; and executing the authentication processing in accordance with an operation performed by a user after the guide is displayed. In the performing the display control, a different guide is displayed in accordance with contents of the obtained information, and in the executing, the authentication processing is executed in accordance with an authentication scheme, which differs in accordance with the contents of the obtained information and corresponds to the displayed guide.
    Type: Application
    Filed: June 3, 2019
    Publication date: December 19, 2019
    Inventor: Yu Kawai
  • Publication number: 20190334346
    Abstract: In an electrical power conversion apparatus including DC power sources, electric power converter units, and an electric power sharing regulator for regulating electric power on a basis of individual electric power converter units, when the plurality of electric power converter units connects thereto a plurality of DC power sources on their input sides, and is connected in parallel with one another on their output sides, three threshold values of rated electric power, electric power of the highest efficiency, and electric power of allowable efficiency receive attention from an efficiency characteristic of each of the electric power converter units, and the adjustment of electric power shared by each of the electric power converter units is performed by the electric power sharing regulator so that better efficiency is achieved when the apparatus is viewed in its entirety.
    Type: Application
    Filed: June 22, 2017
    Publication date: October 31, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventor: Yu KAWAI
  • Patent number: 10324668
    Abstract: An information processing method according to the present invention is performed by an information processing apparatus configured to communicate with a communication apparatus by a predetermined communication method, the communication apparatus being capable of communication by the predetermined communication method when in a first state or a second state having power consumption lower than that of the first state. In a case where information corresponding to second setting (in which the communication apparatus enters a third state not capable of the predetermined communication method is made) is obtained from the communication apparatus in the first state, the first setting (in which the communication apparatus enters the second state is made) is requested to be made.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: June 18, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yu Kawai
  • Patent number: 10256747
    Abstract: In a control unit for drive-controlling a switching element unit of each power conversion device, a voltage correction amount calculation unit calculates a correction amount corresponding to voltage drop due to impedance between the switching element unit and filter reactor. A voltage command correcting unit corrects a voltage command generated by the voltage command generation unit, using the correction amount. Thus, for a power conversion device 21 that has a small output impedance, correction is performed so as to increase the output impedance, and a PLL unit changes the frequency in accordance with active power calculated from output voltage and output current of the power conversion device, so as to uniform power allocations.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: April 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiro Kato, Yu Kawai, Kenji Fujiwara, Kikuo Izumi, Tatsuya Okuda
  • Publication number: 20180358907
    Abstract: In a control unit for drive-controlling a switching element unit of each power conversion device, a voltage correction amount calculation unit calculates a correction amount corresponding to voltage drop due to impedance between the switching element unit and filter reactor. A voltage command correcting unit corrects a voltage command generated by the voltage command generation unit, using the correction amount. Thus, for a power conversion device 21 that has a small output impedance, correction is performed so as to increase the output impedance, and a PLL unit changes the frequency in accordance with active power calculated from output voltage and output current of the power conversion device, so as to uniform power allocations.
    Type: Application
    Filed: November 16, 2016
    Publication date: December 13, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiro KATO, Yu KAWAI, Kenji FUJIWARA, Kikuo IZUMI, Tatsuya OKUDA
  • Publication number: 20180285039
    Abstract: An information processing method according to the present invention is performed by an information processing apparatus configured to communicate with a communication apparatus by a predetermined communication method, the communication apparatus being capable of communication by the predetermined communication method when in a first state or a second state having power consumption lower than that of the first state. In a case where information corresponding to second setting (in which the communication apparatus enters a third state not capable of the predetermined communication method is made) is obtained from the communication apparatus in the first state, the first setting (in which the communication apparatus enters the second state is made) is requested to be made.
    Type: Application
    Filed: March 27, 2018
    Publication date: October 4, 2018
    Inventor: Yu Kawai
  • Publication number: 20150217963
    Abstract: A line member connection device which applies an adhesive tape includes: a supply reel which supplies the adhesive tape; a cutter which cuts the adhesive tape drawn from the supply reel; and an intermediate roller via which the adhesive tape drawn from the supply reel is directed to the cutter, the intermediate roller being disposed between the supply reel and the cutter, wherein in cross section taken along a rotation axis of the intermediate roller, a surface of the first roller which supports the adhesive tape is shaped to have a straight section parallel to the rotation axis, and a first inclined section inclined relative to the rotation axis.
    Type: Application
    Filed: January 29, 2015
    Publication date: August 6, 2015
    Inventors: Kazumichi SHIMIZU, Yoshihiro OWAKI, Masaki YOSHIDA, Akihiro YAMAMOTO, Yu KAWAI