Patents by Inventor Kyohei Kada
Kyohei Kada 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: 9791888Abstract: A power reception device in a power transmission system including a power transmission device including a primary coil and the power reception device including a secondary coil, the power transmission device being configured to drive the primary coil and transmit AC power corresponding to a clock signal which is frequency-modulated according to a binary data signal, the primary coil and the secondary coil being electromagnetically coupled together to receive by the secondary coil in the power reception device, the AC power transmitted from the power transmission device, comprises a clock-signal extraction circuit configured to extract the clock signal from an induced voltage induced at one end of the secondary coil in receiving the AC power; and a demodulation circuit configured to generate a pulse synchronously with the clock signal extracted by the clock-signal extraction circuit, and demodulate the pulse to obtain the binary data signal.Type: GrantFiled: October 1, 2012Date of Patent: October 17, 2017Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Kazuyo Ohta, Hideyuki Kihara, Yohei Nagatake, Kyohei Kada
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Patent number: 9306400Abstract: A power transmission device in a power transmission system including the power transmission device including a primary coil and a power reception device including a secondary coil, the primary coil being electromagnetically coupled to the secondary coil, to receive in the power reception device AC power transmitted from the power transmission device, comprises a waveform monitor circuit configured to detect an electric potential at one end of the primary coil and output a waveform monitor signal formed by restricting the detected electric potential to an electric potential which is equal to or higher than a ground electric potential; a waveform detection circuit configured to detect a waveform change in the waveform monitor signal input from the waveform monitor circuit; and a data detection circuit configured to detect data transmitted by load change by a load modulation unit in the power reception device based on a result of detection of the waveform change detected by the waveform detection circuit.Type: GrantFiled: September 27, 2012Date of Patent: April 5, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Hideyuki Kihara, Kazuyo Ohta, Kazuhiro Suzuki, Kyohei Kada, Takaoki Matsumoto
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Patent number: 8362868Abstract: A plane coil which reduces an increase of an effective resistance in a high-frequency area and is made thinner is provided. The plane coil is equipped with plural conductive wires which are parallel to each other, wherein the conductive wires are arranged in a plane and spirally wound, and coil ends of the respective conductive wires are electrically connected to each other at coil lead-out portions and thus are connected in parallel. The conductive wires are arranged in plane, so that a coil thickness does not increase, and the coil is made thinner. Moreover, the plural conductive wires are connected in parallel, an increase of an effective resistance due to an influence of a skin effect in a high-frequency area is reduced.Type: GrantFiled: June 22, 2009Date of Patent: January 29, 2013Assignee: Panasonic CorporationInventors: Hideki Tamura, Tomohiro Ota, Kyohei Kada, Masayuki Suzuki
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Publication number: 20120326662Abstract: A contactless power transmitting device is provided with: a primary coil that can be magnetically coupled with a secondary coil of a contactless power receiving device; a first temperature sensor that detects the ambient temperature of the primary coil; a second temperature sensor that detects the temperature at a different location to the first temperature sensor; and a control unit. The control unit is configured to determine whether a value obtained by subtracting the temperature detected by the second temperature sensor from the ambient temperature of the first coil detected by the first temperature sensor exceeds a predetermined threshold value, and to stop the power to the first coil when the subtracted value exceeds the threshold value.Type: ApplicationFiled: March 8, 2011Publication date: December 27, 2012Inventors: Takaoki Matsumoto, Atsushi Isaka, Kazuhiro Suzuki, Kyohei Kada, Yoshihide Kanakubo, Yohei Nagatake, Kazuyo Ohta
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Publication number: 20120326524Abstract: A portable terminal is activated when receiving verification power transmitted in a contactless manner from a charger using electromagnetic coupling between the charger and the portable terminal. The portable terminal sends an electrical signal (wakeup frame) indicating activation immediately after being activated to the charger. Reception of the wakeup frame triggers the power transmitting device to start a verification process on the power receiving device and perform a detection process for a metal foreign object. After authentication is established, the charger transmits normal power to the portable terminal.Type: ApplicationFiled: March 29, 2011Publication date: December 27, 2012Inventors: Takaoki Matsumoto, Atsushi Isaka, Kazuhiro Suzuki, Kyohei Kada, Yoshihide Kanakubo, Yohei Nagatake, Hideyuki Kihara
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Publication number: 20120326661Abstract: A contactless power-receiving device, which is connected to equipment via a connection terminal and which supplies power to the load for the equipment, provided with: a secondary coil which intersects the alternating magnetic flux generated from a primary coil to which an alternating power is supplied; and a control unit which supplies induced electromotive force of the secondary coil to the load. The control unit determines the amount of charge in the load and determines whether or not to supply power to the load on the basis of the determined amount of charge.Type: ApplicationFiled: March 8, 2011Publication date: December 27, 2012Applicants: Panasonic Corporation, Panasonic Electric Works Co., Ltd.Inventors: Kyohei Kada, Kazuhiro Suzuki, Takaoki Matsumoto, Yoshihide Kanakubo, Yohei Nagatake, Yoshiyuki Konishi
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Publication number: 20120313579Abstract: A primary-side controller (12) retains a reference current value corresponding to an input current measured in the previous detection cycle by an input current measurement unit (11), in a charging state. The primary-side controller (12) adds the retained reference current value and a predetermined current value, and generates a first threshold value. When the input current measured by the input current measurement unit (11) in the latest detection cycle is equal to or greater than the first threshold value, a determination is made that a foreign metal is present in the vicinity of a first coil (L1).Type: ApplicationFiled: March 7, 2011Publication date: December 13, 2012Inventors: Takaoki Matsumoto, Atsushi Isaka, Kazuhiro Suzuki, Kyohei Kada, Yoshihide Kanakubo, Yohei Nagatake, Kazuyo Ohta
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Patent number: 8319376Abstract: A driving circuit drives a switching element such that an ON-period of the switching element is shorter when a power receiving device is detected not to be placed than when the power receiving device is placed.Type: GrantFiled: December 8, 2009Date of Patent: November 27, 2012Assignee: Panasonic CorporationInventors: Hiroyasu Kitamura, Kyohei Kada
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Publication number: 20120201054Abstract: A non-contact power transmission device includes a resonant circuit, which includes a switching element and a primary coil electrically connected to the switching elements. The resonant circuit induces an alternating power with the primary coil in accordance with the resistance value of the resonant circuit by switching the switching element. A secondary coil receives, from the primary coil in a non-contact manner, the alternating power at a position intersecting an alternating magnetic flux occurring at the primary coil. A primary side controller ON/OFF controls the switching element and changes, based on information to be conveyed to the secondary coil, the resistance value of the resonant circuit, thereby modulating the amplitude of the alternating power induced in the primary coil. A secondary side controller demodulates, from the change in the amplitude of the alternating power received by the secondary coil, the information conveyed to the secondary coil.Type: ApplicationFiled: November 16, 2010Publication date: August 9, 2012Applicant: Panasonic CorporationInventors: Hiroyasu Kitamura, Kyohei Kada
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Patent number: 8035998Abstract: A switching power supply includes an active device for pulling out a part of a control signal from a control terminal of the switching device in an RCC, and a control signal generation circuit that applies adjustment voltage as ON/OFF time control voltage to a control terminal of the active device. The active device pulls out the control signal so as to decrease or increase an OFF time of the switching device while fixing the ON time of the switching device when the adjustment voltage is decreased or increased in the active region of the active device, respectively. An element of a timing circuit in the RCC pulls out the control signal so as to increase or decrease an ON time of the switching device while fixing the OFF time of the switching device when the adjustment voltage is decreased or increased in the cut-off region of the active device, respectively.Type: GrantFiled: June 29, 2007Date of Patent: October 11, 2011Assignee: Panasonic Electric Works Co., Ltd.Inventors: Kyohei Kada, Mikio Itou, Sumio Wada, Shousuke Akisada, Atsushi Isaka, Kenji Obata
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Publication number: 20110102125Abstract: A plane coil which reduces an increase of an effective resistance in a high-frequency area and is made thinner is provided. The plane coil is equipped with plural conductive wires which are parallel to each other, wherein the conductive wires are arranged in a plane and spirally wound, and coil ends of the respective conductive wires are electrically connected to each other at coil lead-out portions and thus are connected in parallel. The conductive wires are arranged in plane, so that a coil thickness does not increase, and the coil is made thinner. Moreover, the plural conductive wires are connected in parallel, an increase of an effective resistance due to an influence of a skin effect in a high-frequency area is reduced.Type: ApplicationFiled: June 22, 2009Publication date: May 5, 2011Applicant: PANASONIC ELECTRIC WORKS CO., LTD.,Inventors: Hideki Tamura, Tomohiro Ota, Kyohei Kada, Masayuki Suzuki
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Patent number: 7837134Abstract: An emitter electrode is cooled by a cooler to generate condensed water which is charged by a high voltage applied between the emitter electrode and an opposed electrode and is discharged as a mist of charged minute water particles. A controller is provided to vary a temperature drop to a predetermined minimum temperature in dependence of an environmental temperature detected by a temperature sensor. The temperature drop is made variable in proportion to the environmental temperature. Accordingly, a sufficient amount of water can be condensed on the emitter electrode simply by controlling the cooling of the emitter electrode without relying upon an environmental humidity.Type: GrantFiled: December 18, 2006Date of Patent: November 23, 2010Assignee: Panasonic Electric Works Co., Ltd.Inventors: Shousuke Akisada, Sumio Wada, Toshihisa Hirai, Kishiko Hirai, legal representative, Mikio Itou, Kyohei Kada
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Publication number: 20100171367Abstract: A driving circuit drives a switching element such that an ON-period of the switching element is shorter when a power receiving device is detected not to be placed than when the power receiving device is placed.Type: ApplicationFiled: December 8, 2009Publication date: July 8, 2010Applicant: PANASONIC ELECTRIC WORKS CO., LTD.Inventors: Hiroyasu KITAMURA, Kyohei KADA
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Publication number: 20090303752Abstract: A switching power supply includes an active device for pulling out a part of a control signal from a control terminal of the switching device in an RCC, and a control signal generation circuit that applies adjustment voltage as ON/OFF time control voltage to a control terminal of the active device. The active device pulls out the control signal so as to decrease or increase an OFF time of the switching device while fixing the ON time of the switching device when the adjustment voltage is decreased or increased in the active region of the active device, respectively. An element of a timing circuit in the RCC pulls out the control signal so as to increase or decrease an ON time of the switching device while fixing the OFF time of the switching device when the adjustment voltage is decreased or increased in the cut-off region of the active device, respectively.Type: ApplicationFiled: June 29, 2007Publication date: December 10, 2009Applicant: Panasonic Electric Works Co., Ltd.Inventors: Kyohei Kada, Mikio Itou, Sumio Wada, Shousuke Akisada, Atsushi Isaka, Kenji Obata
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Publication number: 20090272827Abstract: An emitter electrode is cooled by a cooler to generate condensed water which is charged by a high voltage applied between the emitter electrode and an opposed electrode and is discharged as a mist of charged minute water particles. A controller is provided to vary a temperature drop to a predetermined minimum temperature in dependence of an environmental temperature detected by a temperature sensor. The temperature drop is made variable in proportion to the environmental temperature. Accordingly, a sufficient amount of water can be condensed on the emitter electrode simply by controlling the cooling of the emitter electrode without relying upon an environmental humidity.Type: ApplicationFiled: December 18, 2006Publication date: November 5, 2009Inventors: Shousuke Akisada, Sumio Wada, Toshihisa Hirai, Kishiko Hirai, Mikio Itou, Kyohei Kada