Patents by Inventor Nobuhisa Yamaguchi
Nobuhisa Yamaguchi 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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Patent number: 11984735Abstract: A dynamic wireless power transfer system includes a power transmission coil, a power transmission circuit, a power reception coil, a power reception circuit, and a relay circuit. The power transmission coil is provided in a road. The power transmission circuit supplies electric power to the power transmission coil. The power reception coil is provided in a vehicle. The power reception circuit is connected to the power reception coil. The relay circuit transfers electric power between the power transmission coil and the power reception coil in a contactless manner.Type: GrantFiled: January 26, 2022Date of Patent: May 14, 2024Assignees: DENSO CORPORATION, THE UNIVERSITY OF TOKYOInventors: Hayato Sumiya, Eisuke Takahashi, Nobuhisa Yamaguchi, Masaya Takahashi, Hiroshi Fujimoto, Osamu Shimizu
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Patent number: 11984733Abstract: In a dynamic wireless power transfer system, a power transmission coil is provided in a road. A power transmission circuit supplies electric power to the power transmission coil. A power reception coil is provided in a vehicle. A power reception circuit is connected to the power reception coil. A relay circuit is provided in a tire of the vehicle. The relay circuit includes at least two relay coils that are connected in series. The relay circuit transfers electric power from the power transmission coil to the power reception coil by one relay coil of the two relay coils opposing the power transmission coil and the other relay coil opposing the power reception coil. A resonance frequency of the relay circuit is a frequency that is within a fixed range that is centered on an applied frequency of an alternating-current voltage that is applied to the power transmission coil.Type: GrantFiled: January 20, 2022Date of Patent: May 14, 2024Assignee: DENSO CORPORATIONInventors: Hayato Sumiya, Eisuke Takahashi, Nobuhisa Yamaguchi, Masaya Takahashi
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Patent number: 11971721Abstract: To effectively enhance the operation efficiency of an autonomous mobile robot, an autonomous mobile robot control system includes a processor and a plurality of environmental cameras. The processor estimates a moving route of each of a plurality of moving bodies on the basis of characteristics of each of the plurality of moving bodies and sets a subset of the plurality of moving bodies whose moving routes overlap among the detected moving bodies as avoidance processing target moving bodies. The processor generates an avoidance procedure for the avoidance processing target moving bodies so the motion of the avoidance processing target moving bodies does not interfere with the motion of other avoidance target moving bodies.Type: GrantFiled: August 3, 2021Date of Patent: April 30, 2024Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tomohisa Takai, Yuhei Yamaguchi, Satoshi Toyoshima, Yuta Watanabe, Tetsuya Taira, Mikio Honda, Shiro Oda, Nobuhisa Otsuki
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Publication number: 20240106276Abstract: A wireless power supply system includes a plurality of power transmission units that receives and supplies power to a power receiving unit via the power transmission coil in a resonance state, and a switching control unit that switches a state of a first power transmission unit to a resonance state when the magnitude of the magnetic flux generated in a first power transmission coil of the first power transmission unit, which is one of the plurality of power transmission units, is greater than a predetermined threshold value, and switches to a non-resonance state when the magnitude is less than the threshold value. The threshold is set as a magnitude that exceeds the magnetic flux generated in the first power transmission coil due to coupling between the first power transmission coil and a second power transmission coil of a second power transmission unit, which is adjacent to first power transmission coil.Type: ApplicationFiled: November 30, 2023Publication date: March 28, 2024Applicant: DENSO CORPORATIONInventors: Mitsuru SHIBANUMA, Eisuke TAKAHASHI, Masaya TAKAHASHI, Nobuhisa YAMAGUCHI, Kazuyuki KATO
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Publication number: 20240097496Abstract: A power supply system includes: a power transmission circuit provided on the ground side; a high frequency generation circuit that supplies high-frequency electric power to the power transmission circuit; a measurement unit that measures a physical quantity corresponding to the degree of coupling between the power transmission circuit and a power reception circuit provided in a vehicle; and a control unit. When the degree of coupling is determined, based on the measured physical quantity, to be lower than a predetermined degree, the control unit sets the impedance of the power transmission circuit to a first impedance and thereby sets the power transmission circuit to a non-resonant state. In contrast, when the degree of coupling is determined to be not lower than the predetermined degree, the control unit sets the impedance of the power transmission circuit to a second impedance and thereby sets the power transmission circuit to a resonant state.Type: ApplicationFiled: November 29, 2023Publication date: March 21, 2024Applicant: DENSO CORPORATIONInventors: Yusei NAKAYASHIKI, Masaya TAKAHASHI, Nobuhisa YAMAGUCHI, Eisuke TAKAHASHI
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Patent number: 11926227Abstract: In a moving-object power supply system, a control unit selects, as a power transmission segment, one of segments included in at least one power transmission section. The control unit supplies, through a power supply circuit, power to the power transmission segment to thereby generate a magnetic field through a power transmission coil of the power transmission segment. The control unit determines, based on an ascertained first electrical characteristic of the power transmission segment and an ascertained second electrical characteristic of at least one power non-transmission segment, whether there is a malfunction in each of the power transmission segment and the at least one power non-transmission segment.Type: GrantFiled: November 17, 2021Date of Patent: March 12, 2024Assignee: DENSO CORPORATIONInventors: Kouji Mazaki, Nobuhisa Yamaguchi, Eisuke Takahashi, Mitsuru Shibanuma, Shinpei Takita, Masaya Takahashi, Hayato Sumiya, Masaki Kanesaki, Takuya Kiguchi, Kazuhiro Uda, Yuusei Nakayashiki
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Publication number: 20240072579Abstract: A coil assembly for wireless electrical power transmission includes a plurality of external connecting terminals, a power feeding coil, a resonant capacitor electrically connecting with the power feeding coil, and busbars each of which electrically connects between the external connecting terminals.Type: ApplicationFiled: October 25, 2023Publication date: February 29, 2024Applicant: DENSO CORPORATIONInventors: Shimpei TAKITA, Eisuke TAKAHASHI, Nobuhisa YAMAGUCHI, Yusei NAKAYASHIKI
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Patent number: 11901741Abstract: A power supplying device includes a power transmission circuit transmitting AC power and a power transmission resonance circuit including a power transmission coil. A power receiving device includes a power reception resonance circuit including a power reception coil. When a coupling coefficient between the power transmission coil and the power reception coil is a predetermined coupling coefficient, resonance of a first resonance mode having a first resonance frequency and a second resonance mode having a second resonance frequency are generated, a resonance frequency of the power transmission resonance circuit and the power reception resonance circuit is set to a value which is one of the first and second resonance frequencies, and the set value is a frequency deviating from a reference resonance frequency of the power transmission resonance circuit alone by a predetermined deviation frequency or more. A driving frequency of the AC power is set to the set value.Type: GrantFiled: January 25, 2022Date of Patent: February 13, 2024Assignee: DENSO CORPORATIONInventors: Kazuyoshi Obayashi, Nobuhisa Yamaguchi
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Patent number: 11888326Abstract: A contactless power supply device that supplies electric power to a vehicle in a contactless manner, includes: a power transmission resonance circuit; a power source circuit supplying direct-current power; and a power transmission circuit converting the direct-current power of the power source circuit into alternating-current power and supplying alternating-current power to the power transmission resonance circuit. The power transmission circuit includes: an inverter circuit converting the direct-current power of the power source circuit into alternating-current power; and a power transmission-side immittance conversion circuit adjusting the alternating-current power of the inverter circuit and supplies the adjusted alternating-current power to the power transmission resonance circuit.Type: GrantFiled: October 18, 2021Date of Patent: January 30, 2024Assignee: DENSO CORPORATIONInventors: Masaya Takahashi, Yuusei Nakayashiki, Eisuke Takahashi, Masaki Kanesaki, Kazuhiro Uda, Nobuhisa Yamaguchi
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Publication number: 20240006923Abstract: A power transmission apparatus supplies power to a power reception apparatus without contact therebetween. The power transmission apparatus includes: a power conversion unit that outputs an alternating-current voltage of a predetermined frequency; a power transmission unit that has a power transmission coil and a capacitor that is connected to the power transmission coil; a transmission line that connects the power conversion unit and the power transmission unit; and a compensator that is disposed between the power conversion unit and the transmission line. The compensator includes: an inductive reactance element that has an inductive reactance that is greater than an inductive reactance of the transmission line; and a capacitor that reduces an inductive reactance that is a sum of an inductive reactance of the transmission line and an inductive reactance of the inductive reactance element. The inductive reactance element and the capacitor are connected.Type: ApplicationFiled: September 18, 2023Publication date: January 4, 2024Applicant: DENSO CORPORATIONInventors: Mitsuru SHIBANUMA, Masaya TAKAHASHI, Eisuke TAKAHASHI, Nobuhisa YAMAGUCHI
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Patent number: 11850952Abstract: A system for power feeding during traveling includes a coil for power transmission, a power supply unit which supplies power to the coils, at least one shielding member which shields an electromagnetic field of the coil, and a hole provided to the shielding members.Type: GrantFiled: September 15, 2021Date of Patent: December 26, 2023Assignee: DENSO CORPORATIONInventors: Eisuke Takahashi, Hayato Sumiya, Takuya Kiguchi, Nobuhisa Yamaguchi
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Publication number: 20230396100Abstract: A primary-side resonant circuit of a power transmission apparatus has an impedance varying element that increases, when supply of electric power is stopped, an input impedance of the primary-side resonant circuit so as to have predetermined standby current flowing through a primary-side coil. A power reception apparatus includes a magnetic flux amplifier circuit configured to amplify magnetic flux generated by the standby current flowing through the primary-side coil of the primary-side resonant circuit. The power transmission apparatus further includes a primary-side detection circuit configured to detect a change in the voltage of the primary-side coil, a change in electric current flowing through the primary-side coil or a change in a magnetic field in the vicinity of the primary-side coil; each of the changes is caused by the magnetic flux amplified by the magnetic flux amplifier circuit.Type: ApplicationFiled: August 17, 2023Publication date: December 7, 2023Applicant: DENSO CORPORATIONInventors: Masaya TAKAHASHI, Mitsuru SHIBANUMA, Kazuyuki KATO, Yusei NAKAYASHIKI, Eisuke TAKAHASHI, Nobuhisa YAMAGUCHI
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Publication number: 20230387723Abstract: A wireless power transmission system is provided which wirelessly transfer electric power from a power transmitter to a power receiver. The wireless power transmission system works to set a capacitance of a primary capacitor of a primary resonant circuit to undergo resonance with a self-inductance of a primary coil at an angular frequency that is an operating frequency. A tertiary capacitor of a tertiary resonant circuit has a capacitance set to undergo resonance with a self-inductance of a tertiary coil. A secondary capacitor of a secondary resonant circuit has a capacitance set to reduce a reactive component of ac power arising from self-inductances and mutual inductances of the primary coil, the secondary coil, and the tertiary coil.Type: ApplicationFiled: August 10, 2023Publication date: November 30, 2023Applicant: DENSO CORPORATIONInventors: Masaya TAKAHASHI, Mitsuru SHIBANUMA, Kazuyuki KATO, Yusei NAKAYASHIKI, Eisuke TAKAHASHI, Nobuhisa YAMAGUCHI
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Publication number: 20230341478Abstract: A magnetic detection system is provided which is usable in a movable body including a power receiving system that receives power from a power transmission system by electromagnetic induction. The magnetic detection system includes at least one magnetic flux measuring unit that detects a magnetic flux including a magnetic source magnetic flux from a magnetic source disposed on the ground, and a signal processing unit that suppresses influence of a magnetic flux generated from the power receiving system on the magnetic flux measured by the magnetic flux sensor unit, to detect the magnetic source magnetic flux.Type: ApplicationFiled: June 27, 2023Publication date: October 26, 2023Applicant: DENSO CORPORATIONInventors: Kazuyoshi OBAYASHI, Nobuhisa YAMAGUCHI
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Publication number: 20230331102Abstract: A power reception apparatus is installable in a vehicle and configured to receive electric power from a power transmission coil embedded in the ground. The power reception apparatus includes: a relay coil that is arranged on a tired wheel, which includes a tire and a wheel, and includes a first coil and a second coil; a power reception coil; and a power reception circuit. The first coil and the second coil are connected with each other by an electrical conductor. The first coil is arranged inside the tire. The second coil is located so that a distance from a central axis of the tired wheel to the second coil is shorter than a distance from the central axis to the first coil. The power reception coil is located so that when the first coil faces the power transmission coil, the power reception coil faces the second coil.Type: ApplicationFiled: June 26, 2023Publication date: October 19, 2023Applicants: DENSO CORPORATION, THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATIONInventors: Hayato SUMIYA, Shimpei TAKITA, Kazuhiro UDA, Eisuke TAKAHASHI, Nobuhisa YAMAGUCHI, Hiroshi FUJIMOTO, Osamu SHIMIZU, Yasumichi WAKAO, Isao KUWAYAMA
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Publication number: 20230110224Abstract: A coil unit for a contactless power supply system includes a plurality of coils for electric power transfer, and a magnetic flux reduction structure. The plurality of coils include a first coil and a second coil adjacent to the first coil in a predetermined direction. The magnetic flux reduction structure reduces, during electric power transfer using the first coil, magnetic flux by which the first coil causes an induced voltage or induced current to be generated in the second coil.Type: ApplicationFiled: December 9, 2022Publication date: April 13, 2023Applicant: DENSO CORPORATIONInventors: Mitsuru SHIBANUMA, Masaya TAKAHASHI, Eisuke TAKAHASHI, Nobuhisa YAMAGUCHI
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Publication number: 20220320909Abstract: In a wireless power transfer apparatus, a characteristic adjuster has a frequency characteristic that causes, in a power transfer mode from at least one power transmission unit to a power receiving apparatus, a resonant power transmission circuit to have a resonance frequency that substantially matches an operating frequency. The reactance of a power transmission coil has a reference value in the power transfer mode. The frequency characteristic of the characteristic adjuster causes, in a power non-transfer mode from the at least one power transmission unit to the power receiving apparatus, a reactance of a power transmission coil to become an adjusted value that is higher than the reference value.Type: ApplicationFiled: June 17, 2022Publication date: October 6, 2022Applicant: DENSO CORPORATIONInventors: Yuusei NAKAYASHIKI, Masaya TAKAHASHI, Eisuke TAKAHASHI, Nobuhisa YAMAGUCHI
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Publication number: 20220203848Abstract: A vehicle power supply system is configured to supply power to a vehicle from a power supply apparatus laid on a power supply lane of a vehicle travel path, the power supply apparatus includes a plurality of power supply segments laid in a preset interval along the power supply lane, and a controller configured to control the plurality of power supply segments. The controller is configured to estimate timing of the vehicle reaching a next power supply segment that supplies power next after a present power supply segment that is supplying power, from at least a vehicle velocity derived from a change in position of the vehicle, and cause the next power supply segment to start power supply at the timing estimated.Type: ApplicationFiled: March 18, 2022Publication date: June 30, 2022Applicant: DENSO CORPORATIONInventors: Kouji MAZAKI, Nobuhisa YAMAGUCHI, Mitsuru SHIBANUMA
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Publication number: 20220149664Abstract: A contactless power feeding device that supplies electric power to a power receiving device without contact includes: a power transmitting circuit that transmits alternating-current power; and a power transmitting resonator including a power transmitting coil. The input impedance of the power transmitting resonator is set low in a facing state in which a power receiving coil included in the power receiving device faces the power transmitting coil, and the input impedance of the power transmitting resonator is set high in a non-facing state in which the power receiving coil does not face the power transmitting coil.Type: ApplicationFiled: January 25, 2022Publication date: May 12, 2022Applicant: DENSO CORPORATIONInventors: Masaya TAKAHASHI, Eisuke TAKAHASHI, Hayato SUMIYA, Nobuhisa YAMAGUCHI
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Publication number: 20220149665Abstract: A power supplying device includes a power transmission circuit transmitting AC power and a power transmission resonance circuit including a power transmission coil. A power receiving device includes a power reception resonance circuit including a power reception coil. When a coupling coefficient between the power transmission coil and the power reception coil is a predetermined coupling coefficient, resonance of a first resonance mode having a first resonance frequency and a second resonance mode having a second resonance frequency are generated, a resonance frequency of the power transmission resonance circuit and the power reception resonance circuit is set to a value which is one of the first and second resonance frequencies, and the set value is a frequency deviating from a reference resonance frequency of the power transmission resonance circuit alone by a predetermined deviation frequency or more. A driving frequency of the AC power is set to the set value.Type: ApplicationFiled: January 25, 2022Publication date: May 12, 2022Applicant: DENSO CORPORATIONInventors: Kazuyoshi OBAYASHI, Nobuhisa YAMAGUCHI