Patents by Inventor Norikazu SAKAMOTO
Norikazu SAKAMOTO 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: 11855541Abstract: A plurality of power conversion units each include an inductor, a switching circuit, and a PWM control IC. An MPU outputs control signals to the plurality of power conversion units. Output parts of the plurality of power conversion units are connected to an output terminal in a parallel manner. Operating number signal generating circuits of feedback signal generating circuits generate an operating number signal Sop on the basis of individual current signals based on inductor currents in the plurality of power conversion units, and output the operating number signal to the MPU. The MPU sets operations of the plurality of power conversion units on the basis of the operating number signal, and outputs the control signals including the settings of the operations of the power conversion units.Type: GrantFiled: September 9, 2021Date of Patent: December 26, 2023Assignee: Murata Manufacturing Co., Ltd.Inventors: Norikazu Sakamoto, Tatsuya Hosotani
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Publication number: 20230275465Abstract: A wireless power reception circuit system includes a wireless power reception circuit, an electric storage device, a load unit, a digital control circuit, a voltage conversion circuit, a DC-DC converter, smoothing capacitors, a voltage OR circuit, and an external signal setting circuit for resetting the digital control circuit. An enable signal input terminal of the voltage conversion circuit is in a disabled state when the voltage conversion circuit is not controlled by the digital control circuit. The digital control circuit supplies an enable signal to the enable signal input terminal of the voltage conversion circuit when operating the voltage conversion circuit.Type: ApplicationFiled: May 2, 2023Publication date: August 31, 2023Applicant: Murata Manufacturing Co., Ltd.Inventors: Norikazu SAKAMOTO, Tatsuya HOSOTANI
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Publication number: 20230128671Abstract: A wireless power transfer system comprises a power transmission device and a power reception device. The power reception device includes a power reception coil that wirelessly magnetically couples with a power transmission coil included in the power transmission device. The power transmission device includes a switching circuit in which switch elements perform switching operations, an input voltage adjustment circuit that is electrically connected to the switching circuit and adjusts an input voltage, and an MPU. The MPU is configured to recognize a power requirement presented by the power reception device, control the input voltage adjustment circuit and control intermittent oscillation of the switching circuit, and adjust the input voltage to prevent an oscillation stop period of the intermittent oscillation from exceeding a predetermined stop period.Type: ApplicationFiled: December 19, 2022Publication date: April 27, 2023Applicant: Murata Manufacturing Co., Ltd.Inventors: Norikazu SAKAMOTO, Tatsuya HOSOTANI
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Publication number: 20230016857Abstract: A multi-converter power supply system includes a plurality of cell converters, a common node to which an individual output terminal of each of the plurality of cell converters is connected, a current waveform signal generation circuit that generates a current waveform signal corresponding to a current waveform flowing through an individual inductor, a current average signal generation circuit that generates a current average signal by averaging temporal changes that the current waveform signal has in a switching period of a switching control circuit, and an instrumentation amplifier that receives input of a current common signal obtained from the common node and the current average signal and that generates an individual current feedback signal to be fed back to the switching control circuit.Type: ApplicationFiled: September 20, 2022Publication date: January 19, 2023Applicant: Murata Manufacturing Co., Ltd.Inventors: Tatsuya HOSOTANI, Norikazu SAKAMOTO
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Publication number: 20230010809Abstract: A multi-converter power supply system includes a plurality of cell converters, a common node to which an individual output terminal of each of the plurality of cell converters is connected, a current waveform signal generation circuit that generates a current waveform signal corresponding to a current waveform flowing through an individual inductor, and a first instrumentation amplifier that receives input of an individual output voltage signal obtained from the individual output terminal and the current waveform signal and that outputs a signal for comparison with a current common signal shared by a plurality of switching control circuits. The current waveform signal and the individual output voltage signal that are input to the first instrumentation amplifier are formed with reference to a potential of the common node.Type: ApplicationFiled: September 20, 2022Publication date: January 12, 2023Applicant: Murata Manufacturing Co., Ltd.Inventors: Norikazu SAKAMOTO, Osamu MIKI, Tatsuya HOSOTANI
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Publication number: 20210408916Abstract: A plurality of power conversion units each include an inductor, a switching circuit, and a PWM control IC. An MPU outputs control signals to the plurality of power conversion units. Output parts of the plurality of power conversion units are connected to an output terminal in a parallel manner. Operating number signal generating circuits of feedback signal generating circuits generate an operating number signal Sop on the basis of individual current signals based on inductor currents in the plurality of power conversion units, and output the operating number signal to the MPU. The MPU sets operations of the plurality of power conversion units on the basis of the operating number signal, and outputs the control signals including the settings of the operations of the power conversion units.Type: ApplicationFiled: September 9, 2021Publication date: December 30, 2021Applicant: Murata Manufacturing Co., Ltd.Inventors: Norikazu SAKAMOTO, Tatsuya HOSOTANI
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Publication number: 20210152021Abstract: An in-vivo implantable medical device includes a housing, an electronic circuit component, a power reception coil, and a magnetic material. The housing is formed of a biocompatible material and forms an internal space. The electronic circuit component is disposed in the internal space. The power reception coil is disposed in the internal space, interacts with an external electromagnetic field to form an electromagnetic resonance field to receive power. At least part of a region of the housing in which the electromagnetic resonance field is formed is formed of a biocompatible nonmetal material.Type: ApplicationFiled: January 29, 2021Publication date: May 20, 2021Applicant: Murata Manufacturing Co., Ltd.Inventors: Norikazu SAKAMOTO, Tatsuya HOSOTANI, Kiyokazu YAMADA