Patents by Inventor Yuji Hayashi
Yuji Hayashi 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: 9577535Abstract: A power conversion apparatus includes a switch circuit which drives switching elements based on a control signal, a feedback section which performs feedback control, a signal output section which outputs the control signal based on a controlled variable of the feedback control, an output value detecting section which detects an output value outputted from the switch circuit, and an operation determining unit which has an operation stop determination section which determines whether to stop operation of the switching elements based on a rate of change of the output value, and an operation start determination section which determines whether to start operation of the switching elements based on the controlled variable.Type: GrantFiled: February 10, 2014Date of Patent: February 21, 2017Assignees: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Norihito Kimura, Kimikazu Nakamura, Yuji Hayashi
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Publication number: 20160339875Abstract: The on-vehicle optical sensor cleaning system includes a washer pump that feeds a cleaning liquid, an air pump, a nozzle member, and a controller. The air pump includes a discharge valve and discharges air through the discharge valve. The discharge valve opens when air is compressed in the air pump. The nozzle member includes an ejection port that ejects a gas-liquid mixture toward a sensing surface of an on-vehicle optical sensor to remove foreign matter from the sensing surface. The cleaning liquid from the washer pump and the air from the air pump are mixed in the gas-liquid mixture. The controller controls the washer pump and the air pump. The controller is configured so that the gas-liquid mixture is ejected by storing the cleaning liquid in the nozzle member to cover the ejection port and then feeding the air to the nozzle member.Type: ApplicationFiled: April 21, 2016Publication date: November 24, 2016Applicant: ASMO CO., LTD.Inventors: Eiji Ina, Tomoyuki Kikuta, Keita Kawai, Yukihiro Matsushita, Keita Saito, Yuji Hayashi
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Patent number: 9444246Abstract: In a power converter, a driver that drives, according to a control signal, a switching element of a switch circuit for converting input power to output power. The control signal represents how to drive the switching element. A controller outputs the control signal to the driver for controlling the driver. A measuring unit measures a value of input power input to the switch circuit. A protection determining unit determines, based on the measured value of the input power, whether there is a need to protect the power converter. The protection determining unit outputs a stop control signal to at least one of the driver and the controller based on a result of the determination of whether there is a need to protect the power converter. The stop control signal represents whether to forcibly stop drive of the switching element.Type: GrantFiled: May 27, 2014Date of Patent: September 13, 2016Assignees: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Kimikazu Nakamura, Yuji Hayashi
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Patent number: 9343973Abstract: A power conversion apparatus includes a switch circuit which activates switching elements on the basis of a control signal, a feedback means which performs feedback control, a signal output means which outputs the control signal on the basis of a control variable of the feedback control, and a mode switching means which controls switching operation of the switch circuit by switching an operation mode between a normal mode and an intermittent mode in which the number of operations is less than that in the normal mode. The mode switching means changes timing of switching from the normal mode to the intermittent mode, on the basis of either or both of a first detection value which is an input value inputted to the switch circuit and a second detection value which is an output value outputted from the switch circuit.Type: GrantFiled: January 8, 2014Date of Patent: May 17, 2016Assignees: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Norihito Kimura, Kimikazu Nakamura, Yuji Hayashi
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Patent number: 9343986Abstract: In a power converter, a driver drives a switching element using a manipulated variable therefor to convert input power into output power. A first measuring unit measures a value of a first electric parameter depending on the input power. A first determiner determines, from the measured value of the first electric parameter, a first feedback controlled variable. A second measuring unit measures a value of a second electric parameter indicative of the output power, and a calculator calculates, based on the measured value of the second electric parameter and a command value for the second electric parameter, a second feedback controlled variable. A selector selects, based on the measured value of the first electric parameter, one of the first feedback controlled variable and the second feedback controlled variable. A second determiner determines the manipulated variable using the selected one of the first and second feedback controlled variables.Type: GrantFiled: January 16, 2014Date of Patent: May 17, 2016Assignees: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Norihito Kimura, Hideki Itou, Yuji Hayashi
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Patent number: 9333949Abstract: Each of a plurality of nozzles is placed to correspond with a corresponding one of a plurality of washing subjects of a vehicle and is adapted to spray washer fluid over the corresponding one of the washing subjects upon receiving the washer fluid from a pump. A switch valve is adapted to switch a supply destination of the washer fluid, which is pumped from the pump, among the nozzles. A control conduit is placed in a flow path between an inlet of the switch valve and an outlet of a corresponding one of the nozzles and limits a flow quantity of the washer fluid, which is fed from the switch valve to the outlet of the corresponding one of the nozzles.Type: GrantFiled: May 31, 2012Date of Patent: May 10, 2016Assignee: ASMO CO., LTD.Inventors: Yuta Doi, Tomoyuki Kikuta, Yuji Hayashi
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Publication number: 20160118904Abstract: In a power conversion apparatus, an AC/DC conversion circuit part converts AC power supplied from an AC input and output part into DC power. A DC/DC conversion circuit part including a transformer converts the DC power supplied from the AC/DC conversion circuit part into AC power, converts converted AC power into DC power after voltage conversion by the transformer and outputs converted DC power to a DC input and output part. A smoothing capacitor is provided in a connection part between the AC/DC conversion circuit part and the DC/DC conversion circuit part to smooth a voltage at the connection part. A connection switchover part changes a maximum value of the AC voltage at the AC input and output part by switching over a connection state between the AC input and output part and an AC device.Type: ApplicationFiled: October 20, 2015Publication date: April 28, 2016Inventors: Satoru Yoshikawa, Yuji Hayashi, Masakazu Fukada, Tatsuya Murakami
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Patent number: 9294001Abstract: In a power converter, a feedback controller feedback controls a manipulated variable based on a first electrical parameter depending on input power and a feedback controlled variable determined for output power. A dead-time determiner determines a value of the dead time as a function of a boundary condition variable depending on at least one of the input power and the output power. The boundary condition represents a reference for determining whether the power converter is operating in a continuous conduction mode or a discontinuous conduction mode. The continuous conduction mode is designed for a current to be continuously flowing through an inductor included in the power converter or a load as an inductor current. The discontinuous conduction mode is designed for the inductor current to be discontinuously flowing through the inductor.Type: GrantFiled: February 12, 2014Date of Patent: March 22, 2016Assignees: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Norihito Kimura, Kimikazu Nakamura, Yuji Hayashi, Kenji Tomita
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Publication number: 20160036243Abstract: A power supply ECU controls a converter to have a first control region in which a voltage is raised as a coupling coefficient is larger, and a second control region in which the voltage is maintained at a rating irrespective of a coupling coefficient. An ECU controls a converter such that an input impedance of the converter attains a prescribed value in the first control region and controls the converter such that received electric power becomes close to a target by changing the input impedance in the second control region.Type: ApplicationFiled: July 30, 2015Publication date: February 4, 2016Inventors: Yuji Hayashi, Hiroaki Yuasa
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Patent number: 9184736Abstract: A current mode controlled power converter controllable in a digitally processing current mode even during an on time. In the power converter, each control period based on a reference signal includes a slope calculation period in which a slope compensation signal for the control period is calculated by a slope compensation unit. During each slope calculation period, the slope compensation unit negates the slope compensation signal calculated previous to the control period including the slope calculation period, and a reset signal generation unit compares a current detection signal detected by a current detection unit with a current instruction set to an error signal generated by an error signal generation unit to generate a reset signal.Type: GrantFiled: August 30, 2013Date of Patent: November 10, 2015Assignee: DENSO CORPORATIONInventors: Hirofumi Kinjou, Yuji Hayashi, Keiji Shigeoka, Kimikazu Nakamura
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Publication number: 20150303703Abstract: A non-contact power transmitting and receiving system includes an inverter configured to generate a high-frequency voltage, a voltage-current sensor configured to detect a phase difference between an output voltage and an output current of the inverter, a power transmission coil connected to the inverter, a power reception coil configured to receive electric power from the power transmission coil in a contactless manner, a rectifier circuit connected to the power reception coil, and a control unit configured to control the inverter and the rectifier circuit. The inverter includes arms. The rectifier circuit includes arms. The control unit adjusts at least one of switching timing of any arm of the inverter and switching timing of any arm of the rectifier circuit, in accordance with the phase difference detected by the voltage-current sensor.Type: ApplicationFiled: March 9, 2015Publication date: October 22, 2015Inventors: Yuji HAYASHI, Shinji ICHIKAWA
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Patent number: 9160238Abstract: In a power converter, a deviation calculator calculates, in each cycle, a deviation between a value of an input electrical parameter of a switch circuit and a target value selected by a selector in a previous cycle. The input electrical parameter depends on the input power to the switch circuit. A second calculator calculates, in each cycle, a value of a second feedback controlled variable such that the value of the second feedback variable approaches the value of the input electrical parameter. A controller controls, in each cycle, the selector to select one of the value of the first feedback controlled variable and the value of the second feedback controlled variable as the target value for the next cycle according to the deviation calculated by the deviation calculator.Type: GrantFiled: January 22, 2014Date of Patent: October 13, 2015Assignee: DENSO CORPORATIONInventors: Hideki Itou, Norihito Kimura, Yuji Hayashi
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Patent number: 9160237Abstract: An electric power converter has a switching circuit section, a transformer, a rectifier, and a noise filtering element. The rectifier is connected to a secondary coil of the transformer. A closed circuit where the noise current flows is formed by the secondary coil, the rectifier, and the noise filtering element. The transformer and the noise filtering element are disposed in a position next to each other. The secondary coil and the noise filtering element are electrically connected to each other through a terminal for a coil that is a terminal of the secondary coil and a terminal for a filter that is a terminal of the noise filtering element. The terminal for the coil and the terminal for the filter are disposed in a position between the transformer and the noise filtering element.Type: GrantFiled: July 8, 2013Date of Patent: October 13, 2015Assignees: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Hideki Itou, Yuuichi Handa, Yuji Hayashi
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Patent number: 9142346Abstract: A transformer includes a pair of first coils and at least one second coil. The first and second coils are stacked so that the at least one second coil is interposed between the first coils in a common winding axial direction of the first and second coils. Each of the first coils is covered by insulating films and integrated with the insulating films into an integrated body, so that the first coils are electrically insulated from the at least one second coil.Type: GrantFiled: March 28, 2012Date of Patent: September 22, 2015Assignee: DENSO CORPORATIONInventors: Hideki Itou, Yuji Hayashi, Masamichi Ishikawa
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Patent number: 9071149Abstract: A DC-DC converter generates PWM signals PWM1H, PWM1L on the basis of a reference signal CLK1 to drive switching elements connected in series. When generating a reset signal RST, the converter generates PWM signals PWM2H, PWM2L on the basis of the reset signal RST. When generating no reset signal, the converter generates the PWM signals PWM2H, PWM2L on the basis of a reference signal CLK2 in order to drive other switching elements connected in series. The converter generates the reset signal RST at an optional timing to the reference signal CLK1. The reference signal CLK2 is brought forward from the reference signal CLK1 by ?T1. The PWM signals PWM1H, PWM1L are different in timing from the PWM signals PWM2H, PWM2L. This makes it possible to avoid the switching elements diagonally arranged from being simultaneously turned on and off, and suppress a switching loss, and to increase an efficiency of the converter.Type: GrantFiled: March 18, 2013Date of Patent: June 30, 2015Assignee: DENSO CORPORATIONInventors: Hirofumi Kinjou, Keiji Shigeoka, Yuji Hayashi, Kenji Tomita, Kimikazu Nakamura
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Patent number: 8994353Abstract: A power converter includes a control circuit provided with a set signal generator, a current command generator, a reset signal generator, a drive signal generator, and a pulse-width limiter. The set signal generator generates a set signal at every predetermined cycle. The current command generator generates a current command based on an output voltage command and an output voltage. The reset signal generator generates a reset signal based on an input current and the generated current command. The drive signal generator generates a drive signal which turns on in synchronization with the generated set signal to turn on a switching element and which turns off in synchronization with the subsequently generated reset signal to turn off the switching element. The pulse-width limiter limits a pulse-width of the drive signal according to an input voltage and the output voltage, or according to the input voltage and the output voltage command.Type: GrantFiled: September 27, 2012Date of Patent: March 31, 2015Assignee: Denso CorporationInventor: Yuji Hayashi
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Patent number: 8929100Abstract: In an electrical power converter, an input circuit performs switching for converting a supply voltage of a power source to alternating-polarity voltage pulses which are applied to the primary winding of a transformer. Each voltage pulse is controlled (e.g., pulse width or amplitude is adjusted) based on a detected value of current flow in the primary winding, where the value has been detected an even-numbered plurality of voltage pulses previously. Any DC component of current flow in the primary winding, caused by manufacturing deviations between switching elements in the input circuit, can thereby be suppressed, and DC flux bias in the transformer thereby suppressed.Type: GrantFiled: September 6, 2012Date of Patent: January 6, 2015Assignee: Denso CorporationInventors: Takashi Sumi, Hiroyuki Sakakibara, Yuji Hayashi
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Publication number: 20140347767Abstract: In a power converter, a driver that drives, according to a control signal, a switching element of a switch circuit for converting input power to output power. The control signal represents how to drive the switching element. A controller outputs the control signal to the driver for controlling the driver. A measuring unit measures a value of input power input to the switch circuit. A protection determining unit determines, based on the measured value of the input power, whether there is a need to protect the power converter. The protection determining unit outputs a stop control signal to at least one of the driver and the controller based on a result of the determination of whether there is a need to protect the power converter. The stop control signal represents whether to forcibly stop drive of the switching element.Type: ApplicationFiled: May 27, 2014Publication date: November 27, 2014Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Kimikazu NAKAMURA, Yuji HAYASHI
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Publication number: 20140226368Abstract: A power conversion apparatus includes a switch circuit which drives switching elements based on a control signal, a feedback section which performs feedback control, a signal output section which outputs the control signal based on a controlled variable of the feedback control, an output value detecting section which detects an output value outputted from the switch circuit, and an operation determining unit which has an operation stop determination section which determines whether to stop operation of the switching elements based on a rate of change of the output value, and an operation start determination section which determines whether to start operation of the switching elements based on the controlled variable.Type: ApplicationFiled: February 10, 2014Publication date: August 14, 2014Applicants: NIPPON SOKEN, INC., DENSO CORPORATIONInventors: Norihito KIMURA, Kimikazu NAKAMURA, Yuji HAYASHI
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Publication number: 20140226369Abstract: In a power converter, a feedback controller feedback controls a manipulated variable based on a first electrical parameter depending on input power and a feedback controlled variable determined for output power. A dead-time determiner determines a value of the dead time as a function of a boundary condition variable depending on at least one of the input power and the output power. The boundary condition represents a reference for determining whether the power converter is operating in a continuous conduction mode or a discontinuous conduction mode. The continuous conduction mode is designed for a current to be continuously flowing through an inductor included in the power converter or a load as an inductor current. The discontinuous conduction mode is designed for the inductor current to be discontinuously flowing through the inductor.Type: ApplicationFiled: February 12, 2014Publication date: August 14, 2014Applicants: NIPPON SOKEN, INC., DENSO CORPORATIONInventors: Norihito KIMURA, KIMIKAZU NAKAMURA, YUJI HAYASHI, KENJI TOMITA