Patents by Inventor Kenichi Asanuma

Kenichi Asanuma 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: 20220181985
    Abstract: A power conversion system configured to determine whether or not an abnormality is present in a power conversion circuit, and diagnosis method and program for the power conversion circuit are provided. A power conversion system includes a power conversion circuit, a snubber circuit, and a diagnosis unit. The power conversion circuit includes a transformer and a switching element configured to be electrically connected to the transformer, and the power conversion circuit is configured to convert electric power. The snubber circuit is electrically connected to the transformer and is configured to extract electrical energy from the power conversion circuit. The diagnosis unit is configured to make diagnosis for the power conversion circuit in accordance with at least one of a voltage at a terminal of the transformer, a voltage generated at the snubber circuit, or a current generated at the snubber circuit.
    Type: Application
    Filed: March 5, 2020
    Publication date: June 9, 2022
    Inventors: Kenichi ASANUMA, Fumito KUSAMA
  • Patent number: 11329573
    Abstract: A power conversion system according to the present disclosure includes a plurality of power converters for performing power conversion on AC power and is connected to a power grid of multi-phase power that is a combination of multiple alternating current sources with mutually different phases. Each of the plurality of power converters includes a power converter circuit, a setting unit, and a control circuit. The power converter circuit performs power conversion between either DC power or AC power and AC power supplied from any of the multiple alternating current sources. The setting unit selects one of the multiple alternating current sources as a target of the power conversion to be performed by the power converter circuit. The control circuit controls operation of the power converter circuit in accordance with selection made by the setting unit.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: May 10, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kenichi Asanuma, Makoto Ozone
  • Publication number: 20210159809
    Abstract: A power conversion system according to the present disclosure includes a plurality of power converters for performing power conversion on AC power and is connected to a power grid of multi-phase power that is a combination of multiple alternating current sources with mutually different phases. Each of the plurality of power converters includes a power converter circuit, a setting unit, and a control circuit. The power converter circuit performs power conversion between either DC power or AC power and AC power supplied from any of the multiple alternating current sources. The setting unit selects one of the multiple alternating current sources as a target of the power conversion to be performed by the power converter circuit. The control circuit controls operation of the power converter circuit in accordance with selection made by the setting unit.
    Type: Application
    Filed: July 26, 2018
    Publication date: May 27, 2021
    Inventors: Kenichi ASANUMA, Makoto OZONE
  • Patent number: 10978916
    Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and power transmission control circuitry. The foreign substance detector performs a series of multiple processes to determine whether or not a foreign substance is present between two resonators. The power transmission control circuitry repeats a foreign substance detection period and a power transmission period alternately. The foreign substance detection period is a period in which the foreign substance detector performs one of the series of multiple processes. The power transmission period is a period in which the inverter transmits AC power. The power transmission control circuitry also causes the foreign substance detector to divide the series of multiple processes and determine whether or not the foreign substance is present as a result of performing all of the divided series of multiple processes.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: April 13, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tsutomu Sakata, Hiroshi Yamamoto, Hiroshi Kanno, Kenichi Asanuma
  • Patent number: 10886794
    Abstract: A power transmission apparatus oscillates alternating current power at a first frequency (f1) which is lower than a resonant frequency (fr) of the second resonator and at a second frequency (f2) which is higher than the resonant frequency (fr). The power transmission apparatus measures an inductance value Lin (f1) and an inductance value Lin (f2). The inductance value Lin (f1) is measured when the oscillation circuit oscillates alternating current power at the first frequency (f1), and the inductance value Lin (f2) is measured when the oscillation circuit oscillates alternating current power at the second frequency (f2). The power transmission apparatus calculates a coupling coefficient k by using an expression represented by k2=1?Lin(f2)/Lin(f1), to detect relative position of the second resonator to the first resonator on the basis of the coupling coefficient k.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: January 5, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kenichi Asanuma, Hiroshi Yamamoto
  • Patent number: 10630115
    Abstract: An object detecting device includes a coil array including coils, short-circuit switches connected in parallel with the coils, an oscillator circuit that outputs, to the coils, a voltage including an alternating current component, selection switches connected between the coils and the oscillator circuit, a detecting circuit that detects an object based on a change in a physical value such as voltage, and a control circuit that opens and closes the short-circuit switches and the selection switches. When a first selection switch is closed, a first short-circuit switch, which is connected to the first selection switch, is opened. The other selection switches are opened, and the other short-circuit switches are closed.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: April 21, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kenichi Asanuma, Tsutomu Sakata, Atsushi Yamamoto, Hiroshi Kanno
  • Publication number: 20190372398
    Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and power transmission control circuitry. The foreign substance detector performs a series of multiple processes to determine whether or not a foreign substance is present between two resonators. The power transmission control circuitry repeats a foreign substance detection period and a power transmission period alternately. The foreign substance detection period is a period in which the foreign substance detector performs one of the series of multiple processes. The power transmission period is a period in which the inverter transmits AC power. The power transmission control circuitry also causes the foreign substance detector to divide the series of multiple processes and determine whether or not the foreign substance is present as a result of performing all of the divided series of multiple processes.
    Type: Application
    Filed: August 15, 2019
    Publication date: December 5, 2019
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tsutomu SAKATA, Hiroshi YAMAMOTO, Hiroshi KANNO, Kenichi ASANUMA
  • Patent number: 10432030
    Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and a power transmission control circuitry. The power transmission control circuitry causes the foreign substance detector to perform a series of multiple processes and determine whether a foreign substance is present before a transmission of first AC power starts, and then causes the inverter to start the transmission of the first AC power. After the transmission starts, a detection period in which foreign substance detecting is performed and a power transmission period in which transmission of the first AC power is performed are repeated. The series of multiple processes is divided and performed in the multiple repeated detecting periods. The foreign substance detector is caused to divide and perform the series of multiple processes using the detecting periods and determine whether a foreign substance is present.
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: October 1, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tsutomu Sakata, Hiroshi Yamamoto, Hiroshi Kanno, Kenichi Asanuma
  • Patent number: 10250082
    Abstract: A power transmitting antenna includes a first resonant circuit including a power transmitting coil, a power receiving antenna includes a second resonant circuit including a power receiving coil. When the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency. A wireless power transmitting apparatus is provided with a power transmitting circuit configured to generate high-frequency power at a variable frequency, and supply the high-frequency power to the power transmitting antenna.
    Type: Grant
    Filed: April 5, 2017
    Date of Patent: April 2, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hiroshi Kanno, Kenichi Asanuma
  • Patent number: 10170939
    Abstract: A foreign object detector detects a metallic foreign object between a first resonator and a second resonator which is composed of a parallel resonant circuit including a coil and a capacitor. The foreign object detector includes the first resonator; an oscillator circuit capable of oscillating at a first frequency (f1) which is lower than a resonant frequency (fr) of the second resonator and at a second frequency (f2) which is higher than the resonant frequency (fr); and a measurement circuit to measure changes in input impedance of the first resonator. The measurement circuit detects a metallic foreign object between the first resonator and the second resonator based on: changes in input impedance of the first resonator as measured by the measurement circuit while the oscillator circuit is oscillating at the first frequency f1; and changes in input impedance of the first resonator as measured by the measurement circuit while the oscillator circuit is oscillating at the second frequency f2.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: January 1, 2019
    Assignee: Panasonic Intellectual Property Management Co. Ltd.
    Inventors: Kenichi Asanuma, Atsushi Yamamoto, Hiroshi Yamamoto, Hiroshi Kanno
  • Patent number: 10158256
    Abstract: A contactless connector apparatus is provided with a first coil closely opposed to a second coil so as to be electromagnetically coupled thereto. The first coil includes: an inner transmitter coil wound around an axis passing through its center; and an outer transmitter coil wound around the axis and outside the inner coil. One end of the outer transmitter coil is connected to one end of the inner transmitter coil such that, when a current flows through the transmitter coils, a direction of a loop current generated around the axis by a current flowing through the inner transmitter coil is opposite to that of a loop current generated around the axis by a current flowing through the outer transmitter coil. A self-inductance of the outer transmitter coil is larger than that of the inner transmitter coil.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: December 18, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kenichi Asanuma, Atsushi Yamamoto, Tsutomu Sakata, Akio Hidaka, Toshiaki Kikui
  • Patent number: 10148129
    Abstract: A power transmitting device determines transmitting power P(t1) at a beginning of a first unit time, and transmitting power P(t2) at an end of the first unit time, stores a control parameter Q(t3) that determines a voltage of the transmitting power at a beginning of a second unit time, and a control parameter Q(t4) that determines a voltage of the transmitting power at an end of the second unit time, determines a power difference ?P=P(t2)?P(t1) and a difference ?Q=Q(t4)?Q(t3) in the control parameter Q, and, if the ?P is equal to or larger than a first threshold and an absolute value of the ?Q is equal to or larger than a second threshold, determines that there is a foreign object between a receiver resonator and a transmitter resonator and decreases the transmitting power output from an inverter circuit.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: December 4, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kenichi Asanuma, Tsutomu Sakata, Atsushi Yamamoto, Hiroshi Kanno
  • Patent number: 10097047
    Abstract: A power transmission device includes an inverter using a frequency f11 lower than a frequency f0 between a first resonator and a second resonator or a frequency f12 higher than the frequency f0 to generate a first power; an oscillator using a frequency f10 lower than a frequency fr between the first resonator and the second resonator or a frequency f20 higher than the frequency fr to generate a second power; and a power transmission control circuitry setting a foreign object detection period between first and second transmission periods, using the frequency f11 or frequency f12 in the first transmission period, using the frequency f10 or frequency f20 in the foreign object detection period, and if it is determined that a substance is present in the foreign object detection period, transmitting power in the second transmission period at a frequency different from the frequency used in the first transmission period.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: October 9, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hiroshi Yamamoto, Kenichi Asanuma, Tsutomu Sakata, Hiroshi Kanno
  • Patent number: 10020692
    Abstract: A foreign object detector includes: an oscillator circuit 100 having a coil 110 and resonant capacitors Cx, Cy, the oscillator circuit 100 being configured to output a voltage which includes an AC component and a DC component, the AC component having a positive cycle and a negative cycle; and an electric circuit for sensing a variation of the AC component and a variation of the DC component in the voltage output from the oscillator circuit 100 when a foreign object approaches the coil 110.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: July 10, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kenichi Asanuma, Atsushi Yamamoto, Hiroshi Yamamoto
  • Publication number: 20180191207
    Abstract: A power transmission apparatus oscillates alternating current power at a first frequency (f1) which is lower than a resonant frequency (fr) of the second resonator and at a second frequency (f2) which is higher than the resonant frequency (fr). The power transmission apparatus measures an inductance value Lin (f1) and an inductance value Lin (f2). The inductance value Lin (f1) is measured when the oscillation circuit oscillates alternating current power at the first frequency (f1), and the inductance value Lin (f2) is measured when the oscillation circuit oscillates alternating current power at the second frequency (f2). The power transmission apparatus calculates a coupling coefficient k by using an expression represented by k2=1?Lin(f2)/Lin(f1), to detect relative position of the second resonator to the first resonator on the basis of the coupling coefficient k.
    Type: Application
    Filed: February 27, 2018
    Publication date: July 5, 2018
    Inventors: Kenichi ASANUMA, Hiroshi YAMAMOTO
  • Patent number: 9997961
    Abstract: A power transmitting antenna includes a first resonant circuit including a power transmitting coil. A power receiving antenna includes a second resonant circuit including a power receiving coil. When the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency. A wireless power transmitting apparatus is provided with a power transmitting circuit configured to generate high-frequency power at a variable frequency, and supply the high-frequency power to the power transmitting antenna.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: June 12, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hiroshi Kanno, Kenichi Asanuma
  • Patent number: 9941753
    Abstract: A power transmission apparatus oscillates alternating current power at a first frequency (f1) which is lower than a resonant frequency (fr) of the second resonator and at a second frequency (f2) which is higher than the resonant frequency (fr). The power transmission apparatus measures an inductance value Lin (f1) and an inductance value Lin (f2). The inductance value Lin (f1) is measured when the oscillation circuit oscillates alternating current power at the first frequency (f1), and the inductance value Lin (f2) is measured when the oscillation circuit oscillates alternating current power at the second frequency (f2). The power transmission apparatus calculates a coupling coefficient k by using an expression represented by k2=1?Lin(f2)/Lin(f1), to detect relative position of the second resonator to the first resonator on the basis of the coupling coefficient k.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: April 10, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kenichi Asanuma, Hiroshi Yamamoto
  • Publication number: 20180069435
    Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and a power transmission control circuitry. The power transmission control circuitry causes the foreign substance detector to perform a series of multiple processes and determine whether a foreign substance is present before a transmission of first AC power starts, and then causes the inverter to start the transmission of the first AC power. After the transmission starts, a detection period in which foreign substance detecting is performed and a power transmission period in which transmission of the first AC power is performed are repeated. The series of multiple processes is divided and performed in the multiple repeated detecting periods. The foreign substance detector is caused to divide and perform the series of multiple processes using the detecting periods and determine whether a foreign substance is present.
    Type: Application
    Filed: November 7, 2017
    Publication date: March 8, 2018
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LT D.
    Inventors: Tsutomu SAKATA, Hiroshi YAMAMOTO, Hiroshi KANNO, Kenichi ASANUMA
  • Patent number: 9843200
    Abstract: A power transmission device includes an inverter, an oscillator, a foreign substance detector, and a power transmission control circuitry. The power transmission control circuitry causes the foreign substance detector to perform a series of multiple processes and determine whether a foreign substance is present before a transmission of first AC power starts, and then causes the inverter to start the transmission of the first AC power. After the transmission starts, a detection period in which foreign substance detecting is performed and a power transmission period in which transmission of the first AC power is performed are repeated. The series of multiple processes is divided and performed in the multiple repeated detecting periods. The foreign substance detector is caused to divide and perform the series of multiple processes using the detecting periods and determine whether a foreign substance is present.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: December 12, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tsutomu Sakata, Hiroshi Yamamoto, Hiroshi Kanno, Kenichi Asanuma
  • Patent number: 9806542
    Abstract: A wireless power transmitting device includes a self-oscillator circuit, a detection circuit that detects at least one of an oscillation frequency of the self-oscillator circuit and an output voltage of the self-oscillator circuit, a detection resonator that outputs, to detect a position of the power receiving device, power output by the self-oscillator circuit, and a control circuit that detects a degree to which the power receiving device approaches the detection resonator, based on a result of a detection performed by the detection circuit.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: October 31, 2017
    Assignee: PANASONIC CORPORATION
    Inventors: Kenichi Asanuma, Hiroshi Yamamoto