Patents by Inventor Takeo Yamashita
Takeo Yamashita 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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Publication number: 20230409518Abstract: An arithmetic operation device executes a test using a partially reconfigurable programmable logic unit, the programmable logic unit includes a test target circuit which is a user circuit, and a non-test circuit which is a user circuit which is not the test target circuit, and the arithmetic operation device includes a configuration control unit which causes the programmable logic unit to form, by partial reconfiguration, a test partition unit which separates the test target circuit and the non-test circuit, and a partition control unit which controls the test partition unit to test the test target circuit.Type: ApplicationFiled: August 31, 2021Publication date: December 21, 2023Inventors: Yasuhiro IKEDA, Tadanobu TOBA, Kenichi SHIMBO, Atsushi ARATA, Takeo YAMASHITA, Atsushi ICHIGE, Shinichi NONAKA
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Publication number: 20230324971Abstract: There is provided an electronic control device in which a microcomputer and a power source IC are mounted, the electronic control device having high reliability and being capable of performing fixation diagnosis of a safety control signal of the power source IC before activation of the microcomputer. The electronic control device includes a microcomputer, and a power source IC that communicates with the microcomputer. The power source IC includes a monitoring circuit that monitors the microcomputer, a safety processing circuit that outputs a safety control signal when the monitoring circuit determines an occurrence of an abnormality in the microcomputer, and a diagnosis circuit that diagnoses whether or not the safety control signal has a fixation failure. The diagnosis circuit detects whether or not the fixation failure has occurred, based on states of the safety control signal before and after the safety control signal is activated after activation of a power source.Type: ApplicationFiled: May 7, 2021Publication date: October 12, 2023Inventors: Mitsuhiro IWASAKI, Yuri MOIZUMI, Masahiro DOI, Takeo YAMASHITA
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Publication number: 20230268822Abstract: Provided is an inverter device that quickly detects an abnormality of a power device, which is an output unit of the inverter device, and of gate drive to be able to safely control and stop the inverter device. The inverter device includes a gate voltage detection unit 19 that detects a gate voltage VG of the power device with respect to a given threshold voltage, and a drain voltage detection unit 30 that detects a drain voltage with respect to a given threshold voltage. A microcontroller 10 compares a gate drive signal 40 with a gate voltage detection signal 41 to make a diagnosis and compares the gate drive signal 40 with a drain voltage detection signal 42 to make a diagnosis, thereby making a diagnosis on normal drive and detection of the gate voltage VG and on normal drive and detection of the power device. In addition, by generating a gate drive signal to the power device, from a gate voltage detection signal from a counter power device, a dead time is reduced.Type: ApplicationFiled: February 5, 2021Publication date: August 24, 2023Applicant: Hitachi Astemo, Ltd.Inventors: Masahiro DOI, Takeo YAMASHITA, Mitsuhiro IWASAKI
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Patent number: 11726794Abstract: To obtain a highly reliable electronic control device capable of reliably causing a microcomputer to perform normal termination and normal re-activation by controlling a power supply voltage. According to the present invention, an electronic control device 25 includes a microcomputer 18, a power supply control unit 20 that controls a power supply voltage of the microcomputer, and a capacitor 19 provided between the power supply control unit and the microcomputer. The power supply control unit 20 includes a power supply unit 24 that supplies a first power supply voltage V1 to the microcomputer by turning ON an activation signal for activating the microcomputer, and stops the supply of the power supply voltage by turning the activation signal OFF, a reset control unit 14 that generates a Low reset signal by turning the activation signal OFF, and a discharge control unit 12 that discharges electric charges of the capacitor when acquiring the Low reset signal.Type: GrantFiled: August 14, 2020Date of Patent: August 15, 2023Assignee: Hitachi Astemo, Ltd.Inventors: Masahiro Doi, Yuri Moizumi, Takeo Yamashita
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Patent number: 11635472Abstract: A load driving device includes a synchronous rectifier circuit having a driving-side switching element and a reflux-side switching element; a driver control circuit controls the synchronous rectifier circuit; and a voltage monitor circuit that monitors whether the voltage of an output terminal of the synchronous rectifier circuit is within a predetermined voltage range; where the driver control circuit, upon receiving a diagnosis command, performs control so that when the driving-side switching element is switched from ON to OFF, the reflux-Side switching element is also switched to OFF; and the voltage monitor circuit detects a normal state when the voltage to be monitored is within a normal level during a period in which both the driving-side switching element and the reflux-side switching element are turned OFF.Type: GrantFiled: February 14, 2019Date of Patent: April 25, 2023Assignee: HITACHI ASTEMO, LTD.Inventors: Yuri Ohara, Yasushi Sugiyama, Takeo Yamashita, Masahiro Doi
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Publication number: 20230114063Abstract: An electronic control device for power conversion having an integrated safety function and improved reliability includes: a power module for converting DC power into AC power and supply the AC power to a motor; a gate driver for controlling the power module; a microcontroller for controlling the gate driver: a power supply IC for supplying power to at least one of the gate driver and the microcontroller: a discharge circuit for discharging a high voltage supplied to the power module; and a sensor. The power supply IC includes a microcomputer abnormality detection circuit for detecting an abnormality of the microcontroller and a safety processing circuit for determining necessity of safety processing based on an output of at least one of the microcomputer abnormality detection circuit and the sensor and performs the safety processing. The safety processing circuit stops the motor or discharges a high voltage using the discharge circuit.Type: ApplicationFiled: December 28, 2020Publication date: April 13, 2023Applicant: Hitachi Astemo, Ltd.Inventors: Mitsuhiro IWASAKI, Masahiro DOI, Takeo YAMASHITA, Hitomi AOYAMA, Shinichirou HIDA
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Patent number: 11542885Abstract: With a simple configuration, responsiveness between an electronic control unit and a load drive circuit is monitored without deteriorating characteristics of the load drive circuit. The load drive circuit according to the present invention diagnoses an abnormality in responsiveness of a switch element that drives a load based on a drive command of the switch element and a signal at an output terminal of the switch element.Type: GrantFiled: June 11, 2019Date of Patent: January 3, 2023Assignee: HITACHI ASTEMO, LTD.Inventors: Yasuo Shima, Yoshihisa Fujii, Takeo Yamashita
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Publication number: 20220334846Abstract: To obtain a highly reliable electronic control device capable of reliably causing a microcomputer to perform normal termination and normal re-activation by controlling a power supply voltage. According to the present invention, an electronic control device 25 includes a microcomputer 18, a power supply control unit 20 that controls a power supply voltage of the microcomputer, and a capacitor 19 provided between the power supply control unit and the microcomputer. The power supply control unit 20 includes a power supply unit 24 that supplies a first power supply voltage V1 to the microcomputer by turning ON an activation signal for activating the microcomputer, and stops the supply of the power supply voltage by turning the activation signal OFF, a reset control unit 14 that generates a Low reset signal by turning the activation signal OFF, and a discharge control unit 12 that discharges electric charges of the capacitor when acquiring the Low reset signal.Type: ApplicationFiled: August 14, 2020Publication date: October 20, 2022Inventors: Masahiro DOI, Yuri MOIZUMI, Takeo YAMASHITA
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Patent number: 11459996Abstract: Provided is an electronic control unit capable of performing a high-accurate failure diagnosis in a short time as an electronic control unit having a failure diagnosis function. A load drive circuit that drives a load, a control circuit that controls the load drive circuit, and a diagnosis circuit that diagnoses an output state of the load drive circuit and outputs a diagnostic result to the control circuit are provided. The diagnosis circuit outputs a diagnosis completion flag indicating whether or not there is a diagnosis opportunity to the control circuit.Type: GrantFiled: August 8, 2019Date of Patent: October 4, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Yuri Ohara, Yasuo Shima, Masahiro Doi, Takeo Yamashita
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Publication number: 20220189217Abstract: Provided is an electronic control device including a timer that operates during a key-off time period, the electronic control device having high reliability to diagnose whether the timer is normally operated even during the key-off time period. The electronic control device includes a first power supply unit to which a battery voltage is always supplied as a power supply voltage, the first power supply unit including a first timer that measures a key-off time period, a diagnostic timer different from the first timer, and a first timer diagnosis unit that compares a timer value of the first timer with that of the diagnostic timer during the key-off time period.Type: ApplicationFiled: February 5, 2020Publication date: June 16, 2022Inventors: Masahiro DOI, Yasushi SUGIYAMA, Yuri OHARA, Takeo YAMASHITA
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Publication number: 20210341957Abstract: Provided is a highly versatile and reliable power supply device (power supply ASIC) that can support electronic devices with a wide range of drive currents while suppressing a cost increase, and an electronic control device using the same. An electronic control device includes: a first power supply circuit that outputs a first voltage; a second power supply circuit that generates a second voltage from the first voltage; and a first MOSFET arranged independently of the first power supply circuit and the second power supply circuit. The second power supply circuit includes: a reference power supply that outputs a reference voltage; an amplifier that amplifies the reference voltage; a second MOSFET connected in parallel with the first MOSFET; a voltage detection unit that detects a voltage value of a gate terminal of the first MOSFET; and a switching unit that connects an output from the amplifier to either the gate terminal of the first MOSFET or a gate terminal of the second MOSFET.Type: ApplicationFiled: September 19, 2019Publication date: November 4, 2021Inventors: Masahiro DOI, Yuri OHARA, Takeo YAMASHITA
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Publication number: 20210317811Abstract: Provided is an electronic control unit capable of performing a high-accurate failure diagnosis in a short time as an electronic control unit having a failure diagnosis function. A load drive circuit that drives a load, a control circuit that controls the load drive circuit, and a diagnosis circuit that diagnoses an output state of the load drive circuit and outputs a diagnostic result to the control circuit are provided. The diagnosis circuit outputs a diagnosis completion flag indicating whether or not there is a diagnosis opportunity to the control circuit.Type: ApplicationFiled: August 8, 2019Publication date: October 14, 2021Applicant: Hitachi Automotive Systems, Ltd.Inventors: Yuri OHARA, Yasuo SHIMA, Masahiro DOI, Takeo YAMASHITA
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Publication number: 20210218360Abstract: The conventional method requires at least one cycle of diagnostic time for pulse detection, which causes a problem of longer diagnostic time. A load driving device of the present invention includes a synchronous rectifier circuit having a driving-side switching element and a reflux-side switching element; a driver control circuit controls the synchronous rectifier circuit; and a voltage monitor circuit that monitors whether the voltage of an output terminal of the synchronous rectifier circuit is within a predetermined voltage range; where the driver control circuit, upon receiving a diagnosis command, performs control so that when the driving-side switching element is switched from ON to OFF, the reflux-side switching element is also switched to OFF; and the voltage monitor circuit detects a normal state when the voltage to be monitored is within a normal level during a period in which both the driving-side switching element and the reflux-side switching element are turned OFF.Type: ApplicationFiled: February 14, 2019Publication date: July 15, 2021Applicant: Hitachi Automotive Systems, Ltd.Inventors: Yuri OHARA, Yasushi SUGIYAMA, Takeo YAMASHITA, Masahiro DOI
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Publication number: 20210131373Abstract: With a simple configuration, responsiveness between an electronic control unit and a load drive circuit is monitored without deteriorating characteristics of the load drive circuit. The load drive circuit according to the present invention diagnoses an abnormality in responsiveness of a switch element that drives a load based on a drive command of the switch element and a signal at an output terminal of the switch element.Type: ApplicationFiled: June 11, 2019Publication date: May 6, 2021Applicant: Hitachi Automotive Systems, Ltd.Inventors: Yasuo SHIMA, Yoshihisa FUJII, Takeo YAMASHITA
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Patent number: 9780773Abstract: Provided is a load drive slope control device that can reduce EMI noise, and power loss and heat generation when a drive transistor is turned on and off, and can prevent excessive high temperature-induced damage to the drive transistor at an excessive high temperature.Type: GrantFiled: December 13, 2013Date of Patent: October 3, 2017Assignee: Hitachi Automotive Systems, Ltd.Inventors: Takahiro Kawata, Ryoichi Oura, Masahito Sonehara, Yoshitaka Abe, Takeo Yamashita
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Publication number: 20150381159Abstract: Provided is a load drive slope control device that can reduce EMI noise, and power loss and heat generation when a drive transistor is turned on and off, and can prevent excessive high temperature-induced damage to the drive transistor at an excessive high temperature.Type: ApplicationFiled: December 13, 2013Publication date: December 31, 2015Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Takahiro KAWATA, Ryoichi OURA, Masahito SONEHARA, Yoshitaka ABE, Takeo YAMASHITA
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Patent number: 8443840Abstract: Provided is a small, simple-structured, homogeneous and mass-producible excessive pressure release valve which works even at a relatively low excessive pressure to surely and safely release the pressure to the external world. The excessive pressure release valve has an elastic rubber plate and a reversibly openable slit that passes through the upper and the lower surfaces and release the pressure to the external world when the internal excessive pressure stressing on the lower side surface, pushes and opens the slit toward upper surface side. The elastic rubber plate is made of silicone rubber containing 1-20% by mass of silicone oil.Type: GrantFiled: February 14, 2008Date of Patent: May 21, 2013Assignee: Asahi Rubber Inc.Inventors: Masashi Nemoto, Yukio Yaginuma, Takeo Yamashita
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Patent number: 8421512Abstract: A duty compensation circuit including a duty detection circuit, a duty adjustment signal generator for generating a control signal from a detected duty, and a duty adjustment circuit, in which the duty detection circuit executes sampling of a clock at sampling timing obtained by causing the clock to be delayed by a variable delay circuit, thereby detecting a duty. Thereby, duty compensation is enabled without preparing a clock higher in operating speed than a clock before compensation.Type: GrantFiled: June 22, 2011Date of Patent: April 16, 2013Assignee: Hitachi, Ltd.Inventors: Tomoo Murata, Takeo Yamashita
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Publication number: 20110316603Abstract: A duty compensation circuit including a duty detection circuit, a duty adjustment signal generator for generating a control signal from a detected duty, and a duty adjustment circuit, in which the duty detection circuit executes sampling of a clock at sampling timing obtained by causing the clock to be delayed by a variable delay circuit, thereby detecting a duty. Thereby, duty compensation is enabled without preparing a clock higher in operating speed than a clock before compensation.Type: ApplicationFiled: June 22, 2011Publication date: December 29, 2011Inventors: Tomoo MURATA, Takeo YAMASHITA
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Publication number: 20100246078Abstract: A semiconductor integrated circuit device supports maintenance of a signal transfer frequency and waveform quality and electrostatic protection, and also suppresses expansion of a chip area. In order to maintain the signal transfer frequency and the waveform quality as well as to keep an effect of the electrostatic protection, and simultaneously to protect a differential input pair by a single electrostatic protection element and to attain area superiority, the electrostatic protection element that is arbitrarily separable is disposed at a middle point of a terminator.Type: ApplicationFiled: January 11, 2010Publication date: September 30, 2010Inventors: Yoshiyuki UTAGAWA, Takeo Yamashita