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).
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Publication number: 20220181990Abstract: 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: ApplicationFiled: July 4, 2019Publication date: June 9, 2022Applicant: Mitsubishi Electric CorporationInventors: Takeshi AMIMOTO, Yu KAWAI
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Patent number: 11356038Abstract: 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: GrantFiled: January 28, 2019Date of Patent: June 7, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takeshi Amimoto, Yu Kawai
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Patent number: 11228247Abstract: 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: GrantFiled: November 24, 2017Date of Patent: January 18, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yusuke Higaki, Hidehito Yoshida, Yu Kawai, Takahiro Kato
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Publication number: 20220014115Abstract: 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: ApplicationFiled: January 28, 2019Publication date: January 13, 2022Applicant: Mitsubishi Electric CorporationInventors: Takeshi AMIMOTO, Yu KAWAI
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Patent number: 11153460Abstract: 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: GrantFiled: June 3, 2019Date of Patent: October 19, 2021Assignee: Canon Kabushiki KaishaInventor: Yu Kawai
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Publication number: 20210281159Abstract: 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: ApplicationFiled: September 28, 2018Publication date: September 9, 2021Applicant: Mitsubishi Electric CorporationInventor: Yu KAWAI
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Patent number: 10992240Abstract: 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: GrantFiled: September 20, 2018Date of Patent: April 27, 2021Assignees: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of TechnologyInventors: Yu Kawai, Tatsuya Okuda, Jun-ichi Itoh, Hoai Nam Le
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Patent number: 10848065Abstract: 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: GrantFiled: February 16, 2018Date of Patent: November 24, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yu Kawai, Takahiro Kato
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Publication number: 20200295674Abstract: 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: ApplicationFiled: September 20, 2018Publication date: September 17, 2020Applicants: Mitsubishi Electric Corporation, National University Corporation Nagaoka University of TechnologyInventors: Yu KAWAI, Tatsuya OKUDA, Jun-ichi ITOH, Hoai Nam LE
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Patent number: 10752461Abstract: 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: GrantFiled: January 29, 2015Date of Patent: August 25, 2020Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Kazumichi Shimizu, Yoshihiro Owaki, Masaki Yoshida, Akihiro Yamamoto, Yu Kawai
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Publication number: 20200259418Abstract: 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: ApplicationFiled: November 24, 2017Publication date: August 13, 2020Applicant: Mitsubishi Electric CorporationInventors: Yusuke HIGAKI, Hidehito YOSHIDA, Yu KAWAI, Takahiro KATO
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Patent number: 10644504Abstract: 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: GrantFiled: June 22, 2017Date of Patent: May 5, 2020Assignee: Mitsubishi Electric CorporationInventor: Yu Kawai
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Publication number: 20200099305Abstract: 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: ApplicationFiled: February 16, 2018Publication date: March 26, 2020Applicant: Mitsubishi Electric CorporationInventors: Yu KAWAI, Takahiro KATO
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Publication number: 20190387128Abstract: 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: ApplicationFiled: June 3, 2019Publication date: December 19, 2019Inventor: Yu Kawai
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Publication number: 20190334346Abstract: 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: ApplicationFiled: June 22, 2017Publication date: October 31, 2019Applicant: Mitsubishi Electric CorporationInventor: Yu KAWAI
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Patent number: 10324668Abstract: 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: GrantFiled: March 27, 2018Date of Patent: June 18, 2019Assignee: Canon Kabushiki KaishaInventor: Yu Kawai
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Patent number: 10256747Abstract: 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: GrantFiled: November 16, 2016Date of Patent: April 9, 2019Assignee: Mitsubishi Electric CorporationInventors: Takahiro Kato, Yu Kawai, Kenji Fujiwara, Kikuo Izumi, Tatsuya Okuda
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Publication number: 20180358907Abstract: 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: ApplicationFiled: November 16, 2016Publication date: December 13, 2018Applicant: Mitsubishi Electric CorporationInventors: Takahiro KATO, Yu KAWAI, Kenji FUJIWARA, Kikuo IZUMI, Tatsuya OKUDA
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Publication number: 20180285039Abstract: 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: ApplicationFiled: March 27, 2018Publication date: October 4, 2018Inventor: Yu Kawai
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Publication number: 20150217963Abstract: 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: ApplicationFiled: January 29, 2015Publication date: August 6, 2015Inventors: Kazumichi SHIMIZU, Yoshihiro OWAKI, Masaki YOSHIDA, Akihiro YAMAMOTO, Yu KAWAI