Patents by Inventor Shingo Nagaoka

Shingo Nagaoka 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: 20220278554
    Abstract: A control circuit controls a power supply circuit to generate transmitting power having a frequency varying within a frequency range. The control circuit determines a stably transmitting frequency based on a detected output voltage of a power receiver apparatus, the stably transmitting frequency indicating a frequency of the transmitting power at which dependency of the output voltage on a load value of the power receiver apparatus is at least locally minimized within the frequency range. The control circuit determines a transmitting voltage based on the detected output voltage, the transmitting voltage indicating a voltage of the transmitting power at which the output voltage reaches a target voltage when generating transmitting power having the stably transmitting frequency. The control circuit controls the power supply circuit to generate transmitting power having the stably transmitting frequency and the transmitting voltage.
    Type: Application
    Filed: August 5, 2019
    Publication date: September 1, 2022
    Inventors: Taichi MISHIMA, Yuki ITO, Shingo NAGAOKA, Takeshi UEMATSU
  • Publication number: 20220255415
    Abstract: In a power converter apparatus including a PFC circuit operating in a current-critical mode, a zero point of an inductor current is accurately detected. The control circuit includes a current detector unit including a first detection circuit that detects an inductor current, amplifies a voltage corresponding to the detected current with a gain, and outputs it as a detection voltage and a comparison circuit that compares the detected voltage with a predetermined reference voltage and outputs a comparison result signal. The control circuit calculates the reference voltage for making a delay when detecting the zero value of the inductor current substantially zero, based on the detected input voltage, the detected output voltage, the preset delay time, the inductance value of the inductor, the conversion factor in current/voltage converting, the power supply voltage, and the gain, and then, outputs it to the comparison circuit.
    Type: Application
    Filed: July 27, 2020
    Publication date: August 11, 2022
    Inventors: Hiroki ISHIBASHI, Hiroyuki ONISHI, Shingo NAGAOKA
  • Patent number: 11309741
    Abstract: A resonance oscillator circuit is provided to include first and second oscillators. The first oscillator includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element. The second oscillator oscillates by generating a gate signal, which has a frequency identical to that of the output voltage, and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit. The phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: April 19, 2022
    Assignees: OMRON CORPORATION, NATIONAL UNIVERSITY CORPORATION CHIBA UNIVERSITY
    Inventors: Taichi Mishima, Shingo Nagaoka, Takeshi Uematsu, Hiroo Sekiya
  • Publication number: 20220052555
    Abstract: A first detector detects a value of a current or voltage generated by an auxiliary coil. A second detector detects a value of a current flowing through a power transmitting coil. A coupling coefficient estimator estimates a first coupling coefficient between the power transmitting coil and a power receiving coil, based on the value of the current or voltage generated by the auxiliary coil, and estimates a second coupling coefficient between the power transmitting coil and the power receiving coil, based on the value of the current flowing through the power transmitting coil. A control circuit controls a power supply circuit to stop power transmission to a power receiver apparatus when a difference between the coupling coefficients is greater than a threshold.
    Type: Application
    Filed: November 28, 2019
    Publication date: February 17, 2022
    Inventors: Shingo NAGAOKA, Taichi MISHIMA, Takeshi UEMATSU
  • Publication number: 20220052554
    Abstract: A detection circuit detects at least one of a value of a current flowing through a power transmitting coil, and a value of a current or voltage generated by an auxiliary coil. A control circuit determines a transmitting frequency based on the value detected by the detection circuit, the transmitting frequency at least locally minimizing load dependence. The control circuit determines a voltage for the transmitting power at which an output voltage of a power receiver apparatus is equal to a predetermined target voltage when generating the transmitting power having the transmitting frequency determined, and controls the power supply circuit to generate the transmitting power having the transmitting frequency and voltage determined.
    Type: Application
    Filed: November 28, 2019
    Publication date: February 17, 2022
    Inventors: Shingo NAGAOKA, Taichi MISHIMA, Takeshi UEMATSU
  • Publication number: 20210203187
    Abstract: A resonance oscillator circuit is provided to include first and second oscillators. The first oscillator includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element. The second oscillator oscillates by generating a gate signal, which has a frequency identical to that of the output voltage, and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit. The phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.
    Type: Application
    Filed: November 30, 2020
    Publication date: July 1, 2021
    Inventors: Taichi MISHIMA, Shingo NAGAOKA, Takeshi UEMATSU, Hiroo SEKIYA
  • Patent number: 10984945
    Abstract: Provided is a transformer (1), which includes: a core (10) which forms a magnetic circuit and has a middle leg (10a) and a plurality of side legs (10b, 10c) branched from the middle leg (10a); primary windings (11) respectively wound around a first winding leg (10a) and a second winding leg (10b), which are selected from the middle leg (10a) and the side legs (10b, 10c); and a secondary winding (12) wound around either of the first winding leg (10a) or the second winding leg (10b), wherein a first magnetic flux generated by the primary windings (11) from the first winding leg (10a) and a second magnetic flux generated by the primary windings (11) from the second winding leg (10b) differ from each other by a predetermined value or more at a position at which the fluxes do not intersect with the secondary winding (12).
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: April 20, 2021
    Assignee: OMRON Corporation
    Inventors: Shingo Nagaoka, Toshiyuki Zaitsu, Yutaro Okuno, Sadaharu Morishita
  • Patent number: 10770979
    Abstract: The LLC resonant converter includes a bridge circuit configured to receive a DC input voltage, an LLC resonant circuit connected to the bridge circuit, a transformer connected to the LLC resonant circuit, a rectifier circuit connected to the transformer and configured to send out a converted DC voltage, a resonant capacitor changeover circuit, a bridge circuit control section, and a resonant capacitor changeover control section. When the input voltage exceeds a changeover voltage, the operating frequency is raised higher than the resonance frequency, and thereafter the switch is turned off.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: September 8, 2020
    Assignee: OMRON Corporation
    Inventors: Mitsuru Sato, Shingo Nagaoka, Hiroyuki Onishi
  • Publication number: 20200007044
    Abstract: The LLC resonant converter includes a bridge circuit configured to receive a DC input voltage, an LLC resonant circuit connected to the bridge circuit, a transformer connected to the LLC resonant circuit, a rectifier circuit connected to the transformer and configured to send out a converted DC voltage, a resonant capacitor changeover circuit, a bridge circuit control section, and a resonant capacitor changeover control section. When the input voltage exceeds a changeover voltage, the operating frequency is raised higher than the resonance frequency, and thereafter the switch is turned off.
    Type: Application
    Filed: November 20, 2017
    Publication date: January 2, 2020
    Applicant: OMRON Corporation
    Inventors: Mitsuru SATO, Shingo NAGAOKA, Hiroyuki ONISHI
  • Patent number: 10361628
    Abstract: Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A conductive member of the noise eliminator is connected to a stable potential.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: July 23, 2019
    Assignee: OMRON Corporation
    Inventors: Shingo Nagaoka, Hiroyuki Onishi, Takeo Nishikawa
  • Patent number: 10244617
    Abstract: Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A flexible connecting line connected to a conductive member of the noise eliminator is connected to an on-board line disposed on a circuit board.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: March 26, 2019
    Assignee: OMRON Corporation
    Inventors: Shingo Nagaoka, Hiroyuki Onishi, Takeo Nishikawa, Kentaro Hamana
  • Publication number: 20190068065
    Abstract: Provided is an LLC resonant converter capable of achieving high efficiency while preventing saturation of a transformer. The LLC resonant converter includes semiconductor switches connected in series between a positive electrode and a negative electrode of a power source, a transformer including a primary winding, a core, and a secondary winding, a capacitor connected between the negative electrode of the power source and a second end of the primary winding of the transformer, a capacitor, and semiconductor switches connected to each other in series and in parallel with the capacitor, and a secondary side circuit connected to the secondary winding of the transformer, wherein the transformer is a swing choke coil.
    Type: Application
    Filed: February 8, 2018
    Publication date: February 28, 2019
    Applicant: OMRON Corporation
    Inventors: Kohei TANINO, Shingo NAGAOKA, Mitsuru SATO, Masaaki NAGANO, Hiroyuki ONISHI
  • Publication number: 20180240588
    Abstract: Provided is a transformer (1), which includes: a core (10) which forms a magnetic circuit and has a middle leg (10a) and a plurality of side legs (10b, 10c) branched from the middle leg (10a); primary windings (11) respectively wound around a first winding leg (10a) and a second winding leg (10b), which are selected from the middle leg (10a) and the side legs (10b, 10c); and a secondary winding (12) wound around either of the first winding leg (10a) or the second winding leg (10b), wherein a first magnetic flux generated by the primary windings (11) from the first winding leg (10a) and a second magnetic flux generated by the primary windings (11) from the second winding leg (10b) differ from each other by a predetermined value or more at a position at which the fluxes do not intersect with the secondary winding (12).
    Type: Application
    Filed: September 30, 2016
    Publication date: August 23, 2018
    Applicant: OMRON Corporation
    Inventors: Shingo NAGAOKA, Toshiyuki ZAITSU, Yutaro OKUNO, Sadaharu MORISHITA
  • Publication number: 20180048229
    Abstract: Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A conductive member of the noise eliminator is connected to a stable potential.
    Type: Application
    Filed: October 16, 2017
    Publication date: February 15, 2018
    Applicant: OMRON Corporation
    Inventors: Shingo NAGAOKA, Hiroyuki ONISHI, Takeo NISHIKAWA
  • Publication number: 20180042104
    Abstract: Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A flexible connecting line connected to a conductive member of the noise eliminator is connected to an on-board line disposed on a circuit board.
    Type: Application
    Filed: October 17, 2017
    Publication date: February 8, 2018
    Applicant: OMRON Corporation
    Inventors: Shingo NAGAOKA, Hiroyuki ONISHI, Takeo NISHIKAWA, Kentaro HAMANA
  • Patent number: 7906344
    Abstract: The metal fine particles 33 are sparsely fixed on the surface of the transparent substrate 32, and the acceptor 35 for attaching the specific ligand is immobilized on the transparent substrate 32 or the metal fine particles 33. The prism 36 is closely attached to the lower surface of the transparent substrate 32, and the excitation light enters the transparent substrate 32 through the prism 36. The incident light is totally reflected at the surface of the transparent substrate 32, and the evanescent light generated at the surface and the metal fine particles 33 locally plasmon resonate. As the evanescent light and the metal fine particles locally plasmon resonate, a strong electric field is enclosed in the vicinity of the metal fine particles.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: March 15, 2011
    Assignee: OMRON Corporation
    Inventors: Tomohiko Matsushita, Shigeru Aoyama, Takeo Nishikawa, Shingo Nagaoka, Tetsuichi Wazawa
  • Publication number: 20070273884
    Abstract: The metal fine particles 33 are sparsely fixed on the surface of the transparent substrate 32, and the acceptor 35 for attaching the specific ligand is immobilized on the transparent substrate 32 or the metal fine particles 33. The prism 36 is closely attached to the lower surface of the transparent substrate 32, and the excitation light enters the transparent substrate 32 through the prism 36. The incident light is totally reflected at the surface of the transparent substrate 32, and the evanescent light generated at the surface and the metal fine particles 33 locally plasmon resonate. As the evanescent light and the metal fine particles locally plasmon resonate, a strong electric field is enclosed in the vicinity of the metal fine particles.
    Type: Application
    Filed: March 30, 2005
    Publication date: November 29, 2007
    Inventors: Tomohiko Matsushita, Shigeru Aoyama, Takeo Nishikawa, Shingo Nagaoka, Tetsuichi Wazawa