Patents by Inventor Ryosuke Kanemitsu

Ryosuke Kanemitsu 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).

  • Publication number: 20210274616
    Abstract: An LED driving device includes a DC/DC controller which controls an output stage for supplying an output voltage to an LED; and a current driver which generates an output current of the LED. The current driver performs PWM dimming by turning on the output current in accordance with an LED-current-on period of a PWM dimming signal and turning off the output current in accordance with an LED-current-off period of the PWM dimming signal. The DC/DC controller includes a feedback control unit which performs feedback control for outputting a switching pulse to the output stage so as to make a cathode voltage of the LED equal to a reference voltage. A pulse addition control unit performs pulse addition control for adding a predetermined pulse number of additional switching pulses at a time of switching between the LED-current-on period and the LED-current-off period.
    Type: Application
    Filed: February 21, 2019
    Publication date: September 2, 2021
    Inventors: Ryosuke Kanemitsu, Koji Katsura
  • Patent number: 10820385
    Abstract: An LED drive circuit drives an LED module. The LED module has a light-emitting diode, and an identification unit having characteristic information relating to light-emitting characteristics of the light-emitting diode. The LED drive circuit includes a detection unit and a drive circuit. The detection unit is provided for detecting characteristic information, and generates a detection signal that corresponds to the characteristic information. The drive circuit generates drive current by a drive signal supplied according to the characteristic information based on the detection signal, and supplies the drive current to drive the light-emitting diode.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: October 27, 2020
    Assignee: Rohm Co., Ltd.
    Inventors: Kenichi Fukumoto, Koji Katsura, Ryosuke Kanemitsu, Junichi Itai, Nobuaki Matsui, Seiji Nakashima, Kouji Miyamoto
  • Publication number: 20190387591
    Abstract: An LED drive circuit drives an LED module. The LED module has a light-emitting diode, and an identification unit having characteristic information relating to light-emitting characteristics of the light-emitting diode. The LED drive circuit includes a detection unit and a drive circuit. The detection unit is provided for detecting characteristic information, and generates a detection signal that corresponds to the characteristic information. The drive circuit generates drive current by a drive signal supplied according to the characteristic information based on the detection signal, and supplies the drive current to drive the light-emitting diode.
    Type: Application
    Filed: January 31, 2018
    Publication date: December 19, 2019
    Applicant: ROHM CO., LTD.
    Inventors: Kenichi FUKUMOTO, Koji Katsura, Ryosuke Kanemitsu, Junichi ITAI, Nobuaki MATSUI, Seiji NAKASHIMA, Kouji Miyamoto
  • Patent number: 10405386
    Abstract: A light emitting element driving apparatus includes the following: current source; error amplifier generating error signal based on comparison of a first reference voltage with the highest voltage among total forward drop voltages of element arrays or feedback voltage corresponding to a drive voltage; first and second switches for ON/OFF control to apply the feedback voltage to first and second input terminals of the error amplifier respectively; slope voltage generating circuit; PWM comparator generating a pulse modulation signal; drive amplifier controlled by the pulse modulation signal and drives a switching element supplying the drive voltage to the element arrays; PWM width detector that outputs a pulse width detection signal having different levels between when the pulse width is less than predetermined threshold value and when equal to or greater than the threshold value, and switches ON/OFF of the first and second switches based on the pulse width detection signal.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: September 3, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Koji Katsura, Ryosuke Kanemitsu, Keisuke Miura
  • Publication number: 20180317292
    Abstract: A light emitting element driving apparatus includes the following: current source; error amplifier generating error signal based on comparison of a first reference voltage with the highest voltage among total forward drop voltages of element arrays or feedback voltage corresponding to a drive voltage; first and second switches for ON/OFF control to apply the feedback voltage to first and second input terminals of the error amplifier respectively; slope voltage generating circuit; PWM comparator generating a pulse modulation signal; drive amplifier controlled by the pulse modulation signal and drives a switching element supplying the drive voltage to the element arrays; PWM width detector that outputs a pulse width detection signal having different levels between when the pulse width is less than predetermined threshold value and when equal to or greater than the threshold value, and switches ON/OFF of the first and second switches based on the pulse width detection signal.
    Type: Application
    Filed: April 19, 2018
    Publication date: November 1, 2018
    Inventors: Koji Katsura, Ryosuke Kanemitsu, Keisuke Miura
  • Patent number: 10068511
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: September 4, 2018
    Assignee: Rohm Co., Ltd.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Publication number: 20170249884
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Application
    Filed: May 16, 2017
    Publication date: August 31, 2017
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Patent number: 9686836
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: June 20, 2017
    Assignee: Rohm Co., Ltd.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Publication number: 20160302269
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Application
    Filed: June 21, 2016
    Publication date: October 13, 2016
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Patent number: 9396626
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: July 19, 2016
    Assignee: Rohm Co., Ltd.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Patent number: 9232584
    Abstract: The present invention provides a light emitting diode (LED) driving device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an output discharging circuit, for performing, based on a predetermined control signal, discharging of the output voltage when a generation action of the output voltage and the output current stops.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: January 5, 2016
    Assignee: Rohm Co., Ltd.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Publication number: 20150116635
    Abstract: The present invention provides a light emitting diode (LED) driving device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an output discharging circuit, for performing, based on a predetermined control signal, discharging of the output voltage when a generation action of the output voltage and the output current stops.
    Type: Application
    Filed: January 5, 2015
    Publication date: April 30, 2015
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Patent number: 8957598
    Abstract: The present invention provides a light emitting diode (LED) driving device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an output discharging circuit, for performing, based on a predetermined control signal, discharging of the output voltage when a generation action of the output voltage and the output current stops.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: February 17, 2015
    Assignee: Rohm Co., Ltd.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Publication number: 20140232547
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Application
    Filed: April 23, 2014
    Publication date: August 21, 2014
    Applicant: ROHM CO., LTD.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Patent number: 8754579
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: June 17, 2014
    Assignee: Rohm Co., Ltd.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Patent number: 8497671
    Abstract: The load driving device disclosed in the specification includes a controller to generate a first control signal based on an input signal, a first output transistor to supply an output current to a load according to the first control signal, a first dividing circuit to output a first divided voltage by dividing a voltage across a first primary electrode and a second primary electrode of the first output transistor by a first transistor and a second transistor connected in serial, a first voltage generating circuit to output a first reference voltage, and a first comparator to supply a first over current detection signal to the controller based on the first reference voltage and the first divided voltage.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: July 30, 2013
    Assignee: Rohm Co., Ltd.
    Inventor: Ryosuke Kanemitsu
  • Publication number: 20130015781
    Abstract: The present invention provides a light emitting diode (LED) driving device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an output discharging circuit, for performing, based on a predetermined control signal, discharging of the output voltage when a generation action of the output voltage and the output current stops.
    Type: Application
    Filed: July 9, 2012
    Publication date: January 17, 2013
    Applicant: ROHM CO., LTD.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Publication number: 20130016310
    Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.
    Type: Application
    Filed: July 9, 2012
    Publication date: January 17, 2013
    Applicant: ROHM CO., LTD.
    Inventors: Ryosuke Kanemitsu, Masaaki Nakayama
  • Publication number: 20110298443
    Abstract: The load driving device disclosed in the specification includes a controller to generate a first control signal based on an input signal, a first output transistor to supply an output current to a load according to the first control signal, a first dividing circuit to output a first divided voltage by dividing a voltage across a first primary electrode and a second primary electrode of the first output transistor by a first transistor and a second transistor connected in serial, a first voltage generating circuit to output a first reference voltage, and a first comparator to supply a first over current detection signal to the controller based on the first reference voltage and the first divided voltage.
    Type: Application
    Filed: June 7, 2011
    Publication date: December 8, 2011
    Applicant: ROHM CO., LTD.
    Inventor: Ryosuke Kanemitsu