Patents by Inventor Takahisa Koyasu
Takahisa Koyasu 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: 11451202Abstract: A signal output circuit includes an inverting amplifier circuit, a feedback capacitor and a low pass filter. The inverting amplifier circuit includes an input terminal and an output terminal. The inverting amplifier circuit executes an inverting amplification based on an input signal to output a signal to the output terminal at a pull-up state. An output stage of the inverting amplifier circuit is an open collector or an open drain. The feedback capacitor is connected between the input terminal and the output terminal of the inverting amplifier circuit. The low pass filter has an input and an output. The input of the low pass filter is connected to the output terminal of the inverting amplifier. The output of the low pass filter is connected to the feedback capacitor.Type: GrantFiled: December 22, 2020Date of Patent: September 20, 2022Assignee: DENSO CORPORATIONInventor: Takahisa Koyasu
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Publication number: 20210111682Abstract: A signal output circuit includes an inverting amplifier circuit, a feedback capacitor and a low pass filter. The inverting amplifier circuit includes an input terminal and an output terminal. The inverting amplifier circuit executes an inverting amplification based on an input signal to output a signal to the output terminal at a pull-up state. An output stage of the inverting amplifier circuit is an open collector or an open drain. The feedback capacitor is connected between the input terminal and the output terminal of the inverting amplifier circuit. The low pass filter has an input and an output. The input of the low pass filter is connected to the output terminal of the inverting amplifier. The output of the low pass filter is connected to the feedback capacitor.Type: ApplicationFiled: December 22, 2020Publication date: April 15, 2021Inventor: Takahisa Koyasu
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Patent number: 10056752Abstract: A rotary electric machine for a vehicle is provided. The rotary electric machine includes a power system circuit which has a power element and is grounded via a first ground terminal and a first connecting line and a control system circuit which controls the power system circuit and is grounded via a second ground terminal and a second connecting line.Type: GrantFiled: May 9, 2014Date of Patent: August 21, 2018Assignee: DENSO CORPORATIONInventors: Harumi Horihata, Tadatoshi Asada, Takahisa Koyasu
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Patent number: 9948285Abstract: A drive control device includes: an input unit of a command; and a control unit setting a period for rising a current in an inductive load to first and third periods in first and second commands, and setting a period for falling the current to second and fourth periods in the first and second commands, respectively. When the first command is changed to the second command, and at least one middle PMW pulse is disposed between a forward PWM pulse corresponding to the first command and an after PWM pulse corresponding to the second command, the control unit sets fifth and sixth periods in the middle PWM pulse corresponding to the first and second periods of the forward PWM pulse to a length between the first and second periods in the forward PWM pulse and the third and fourth periods in the after PWM pulse, respectively.Type: GrantFiled: February 17, 2016Date of Patent: April 17, 2018Assignee: DENSO CORPORATIONInventors: Takahisa Koyasu, Yasuyuki Maeda
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Publication number: 20160269015Abstract: A drive control device includes: an input unit of a command; and a control unit setting a period for rising a current in an inductive load to first and third periods in first and second commands, and setting a period for falling the current to second and fourth periods in the first and second commands, respectively. When the first command is changed to the second command, and at least one middle PMW pulse is disposed between a forward PWM pulse corresponding to the first command and an after PWM pulse corresponding to the second command, the control unit sets fifth and sixth periods in the middle PWM pulse corresponding to the first and second periods of the forward PWM pulse to a length between the first and second periods in the forward PWM pulse and the third and fourth periods in the after PWM pulse, respectively.Type: ApplicationFiled: February 17, 2016Publication date: September 15, 2016Inventors: Takahisa KOYASU, Yasuyuki MAEDA
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Patent number: 9106459Abstract: A communication circuit apparatus includes: multiple level shift circuits, each of which receives an input signal corresponding to a respective communication bus; an activation comparator for generating an activation signal when the input signal is input into one of the level shift circuits, and a level of the input signal exceeds a predetermined threshold; multiple input current voltage conversion circuits, each of which is arranged together with a respective level shift circuit, converts the input signal to a voltage signal, and outputs the voltage signal as an identification signal; and an identification circuit for identifying one of the communication busses based on the identification signal, which is output from one of the input current voltage conversion circuits. The one of the communication busses corresponds to the one of the level shift circuits, in which the input signal is input.Type: GrantFiled: July 2, 2014Date of Patent: August 11, 2015Assignee: DENSO CORPORATIONInventor: Takahisa Koyasu
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Publication number: 20150035565Abstract: A communication circuit apparatus includes: multiple level shift circuits, each of which receives an input signal corresponding to a respective communication bus; an activation comparator for generating an activation signal when the input signal is input into one of the level shift circuits, and a level of the input signal exceeds a predetermined threshold; multiple input current voltage conversion circuits, each of which is arranged together with a respective level shift circuit, converts the input signal to a voltage signal, and outputs the voltage signal as an identification signal; and an identification circuit for identifying one of the communication busses based on the identification signal, which is output from one of the input current voltage conversion circuits. The one of the communication busses corresponds to the one of the level shift circuits, in which the input signal is input.Type: ApplicationFiled: July 2, 2014Publication date: February 5, 2015Inventor: Takahisa KOYASU
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Publication number: 20140334044Abstract: A rotary electric machine for a vehicle is provided. The rotary electric machine includes a power system circuit which has a power element and is grounded via a first ground terminal and a first connecting line and a control system circuit which controls the power system circuit and is grounded via a second ground terminal and a second connecting line.Type: ApplicationFiled: May 9, 2014Publication date: November 13, 2014Inventors: Harumi HORIHATA, Tadatoshi ASADA, Takahisa KOYASU
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Patent number: 8598919Abstract: A MOSFET at an input side controls the operation of a current mirror circuit in accordance with a level change of a PWM signal applied to its gate. When the current mirror circuit operates, a current generated by a current source flows as a mirror current so that a current flows to discharge electricity charged in a capacitance between a gate and a source through a gate of a MOSFET at an output side. When the current mirror circuit stops its operation, a current flowing from the current mirror circuit through the current source is supplied to the gate of the MOSFET at the output side.Type: GrantFiled: December 9, 2010Date of Patent: December 3, 2013Assignee: DENSO CORPORATIONInventor: Takahisa Koyasu
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Patent number: 8598918Abstract: When a transmission signal is detected as having been changed from a high level to a low level, two transmission lines are connected for only a predetermined time through a diode by a first transistor and a second transistor. The diode is arranged such that its forward direction is from a high-side transmission line to a low-side transmission line. The diode turns on, when a potential of the high-side transmission line becomes higher than that of the low-side transmission line by ringing and a potential difference therebetween exceeds a forward drop voltage of the diode. As a result, a peak wave level of a positive side in the ringing is limited to the forward drop voltage of the diode.Type: GrantFiled: April 29, 2011Date of Patent: December 3, 2013Assignees: Nippon Soken, Inc., DENSO CORPORATIONInventors: Youichirou Suzuki, Noboru Maeda, Yasuhiro Fukagawa, Takahisa Koyasu, Masakiyo Horie, Tomohisa Kishigami
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Patent number: 8320471Abstract: In a transmission device for differential communication, a first cathode-side element part is coupled between a first communication line and a cathode-side power supply line, a second cathode-side element part is coupled between a second communication line and the cathode-side power supply line, a first anode-side element part is coupled between the first communication line and an anode-side power supply line, and a second anode-side element part is coupled between the second communication line and the anode-side power supply line. A driving portion drives the element parts based on transmission data input from an outside. A target potential generating portion generates target potentials of the element parts based on potentials of the first communication line and the second communication line.Type: GrantFiled: September 20, 2010Date of Patent: November 27, 2012Assignees: DENSO CORPORATION, Nippon Soken, Inc.Inventors: Noboru Maeda, Youichirou Suzuki, Shigeki Takahashi, Kazuyoshi Nagase, Takahisa Koyasu
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Patent number: 8229032Abstract: A signal receiver includes: a receiving circuit that receives a differential signal via a transmission line, which includes a pair of signal wires for transmitting the differential signal; and an impedance control circuit that controls an input impedance so as to reduce a common mode noise. The impedance control circuit includes a detection element for detecting at least one of a voltage, a current and an electric power of the common mode noise. The impedance control circuit controls the input impedance in accordance with change of the at least one of the voltages the current and the electric power of the common mode noise.Type: GrantFiled: February 20, 2009Date of Patent: July 24, 2012Assignees: DENSO CORPORATION, Nippon Soken, Inc.Inventors: Youichirou Suzuki, Noboru Maeda, Shigeki Takahashi, Koji Kondo, Kazuyoshi Nagase, Takahisa Koyasu
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Patent number: 8160531Abstract: A receiving device is provided capable of avoiding reception of unnecessary energy when a signal waveform actually changes on a receiving side. An impedance control circuit includes a sensing unit to sense one or more of a voltage, current, or power of a signal to be received by a receiving circuit. The impedance control unit varies an input impedance according to the change in the sensed one or more quantities so that the received signal will be reflected. Thus the excess energy of the signal is reflected and fed to any other receiving circuit achieving stable communications.Type: GrantFiled: March 10, 2009Date of Patent: April 17, 2012Assignees: Nippon Soken, Inc., Denso CorporationInventors: Youichirou Suzuki, Noboru Maeda, Takahisa Koyasu, Koji Kondo, Shigeki Takahashi
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Patent number: 8098084Abstract: A transmission apparatus for differential communication includes a driver bridge circuit and a pair of noise protection circuits. The driver bridge circuit includes four output devices that are independently connected between each of a pair of transmission lines and a power line or a ground line. Each noise protection circuit is provided to a corresponding transmission lines. Each noise protection circuit includes a ground potential detector and an impedance controller. The ground potential detector detects a potential of the corresponding transmission line with respect to the ground line. The impedance controller causes an impedance of the corresponding transmission line with respect to the ground line to become equal to an impedance of the other transmission line with respect to the ground line, when the detected potential becomes outside a predetermined potential range.Type: GrantFiled: October 12, 2010Date of Patent: January 17, 2012Assignees: Nippon Soken, Inc., Denso CorporationInventors: Youichirou Suzuki, Noboru Maeda, Shigeki Takahashi, Takahisa Koyasu, Kazuyoshi Nagase, Tomohisa Kishigami
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Publication number: 20110285424Abstract: When a transmission signal is detected as having been changed from a high level to a low level, two transmission lines are connected for only a predetermined time through a diode by a first transistor and a second transistor. The diode is arranged such that its forward direction is from a high-side transmission line to a low-side transmission line. The diode turns on, when a potential of the high-side transmission line becomes higher than that of the low-side transmission line by ringing and a potential difference therebetween exceeds a forward drop voltage of the diode. As a result, a peak wave level of a positive side in the ringing is limited to the forward drop voltage of the diode.Type: ApplicationFiled: April 29, 2011Publication date: November 24, 2011Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Youichirou Suzuki, Noboru Maeda, Yasuhiro Fukagawa, Takahisa Koyasu, Masakiyo Horie, Tomohisa Kishigami
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Publication number: 20110169475Abstract: A MOSFET at an input side controls the operation of a current mirror circuit in accordance with a level change of a PWM signal applied to its gate. When the current mirror circuit operates, a current generated by a current source flows as a mirror current so that a current flows to discharge electricity charged in a capacitance between a gate and a source through a gate of a MOSFET at an output side. When the current mirror circuit stops its operation, a current flowing from the current mirror circuit through the current source is supplied to the gate of the MOSFET at the output side.Type: ApplicationFiled: December 9, 2010Publication date: July 14, 2011Applicant: DENSO CORPORATIONInventor: Takahisa KOYASU
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Publication number: 20110135014Abstract: In a transmission device for differential communication, a first cathode-side element part is coupled between a first communication line and a cathode-side power supply line, a second cathode-side element part is coupled between a second communication line and the cathode-side power supply line, a first anode-side element part is coupled between the first communication line and an anode-side power supply line, and a second anode-side element part is coupled between the second communication line and the anode-side power supply line. A driving portion drives the element parts based on transmission data input from an outside. A target potential generating portion generates target potentials of the element parts based on potentials of the first communication line and the second communication line.Type: ApplicationFiled: September 20, 2010Publication date: June 9, 2011Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Noboru Maeda, Youichirou Suzuki, Shigeki Takahashi, Kazuyoshi Nagase, Takahisa Koyasu
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Publication number: 20110084730Abstract: A transmission apparatus for differential communication includes a driver bridge circuit and a pair of noise protection circuits. The driver bridge circuit includes four output devices that are independently connected between each of a pair of transmission lines and a power line or a ground line. Each noise protection circuit is provided to a corresponding transmission lines. Each noise protection circuit includes a ground potential detector and an impedance controller. The ground potential detector detects a potential of the corresponding transmission line with respect to the ground line. The impedance controller causes an impedance of the corresponding transmission line with respect to the ground line to become equal to an impedance of the other transmission line with respect to the ground line, when the detected potential becomes outside a predetermined potential range.Type: ApplicationFiled: October 12, 2010Publication date: April 14, 2011Applicants: NIPPON SOKEN, INC., DENSO CORPORATIONInventors: Youichirou SUZUKI, Noboru MAEDA, Shigeki TAKAHASHI, Takahisa KOYASU, Kazuyoshi NAGASE, Tomohisa KISHIGAMI
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Publication number: 20090296830Abstract: A signal receiver includes: a receiving circuit that receives a differential signal via a transmission line, which includes a pair of signal wires for transmitting the differential signal; and an impedance control circuit that controls an input impedance so as to reduce a common mode noise. The impedance control circuit includes a detection element for detecting at least one of a voltage, a current and an electric power of the common mode noise. The impedance control circuit controls the input impedance in accordance with change of the at least one of the voltages the current and the electric power of the common mode noise.Type: ApplicationFiled: February 20, 2009Publication date: December 3, 2009Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Youichirou SUZUKI, Noboru MAEDA, Shigeki TAKAHASHI, Koji KONDO, Kazuyoshi NAGASE, Takahisa KOYASU
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Publication number: 20090233565Abstract: A receiving device is provided capable of avoiding reception of unnecessary energy when a signal waveform actually changes on a receiving side. An impedance control circuit includes a sensing unit to sense one or more of a voltage, current, or power of a signal to be received by a receiving circuit. The impedance control unit varies an input impedance according to the change in the sensed one or more quantities so that the received signal will be reflected. Thus the excess energy of the signal is reflected and fed to any other receiving circuit achieving stable communications.Type: ApplicationFiled: March 10, 2009Publication date: September 17, 2009Applicants: NIPPON SOKEN, INC, DENSO CORPORATIONInventors: Youichirou Suzki, Noboru Maeda, Takahisa Koyasu, Koji Kondo, Shigeki Takahashi