Patents by Inventor Koji Katsura

Koji Katsura 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
  • Patent number: 10562438
    Abstract: A light-emitting element driving semiconductor integrated circuit constitutes at least part of a light-emitting element driving device that is configured to drive a first and a second light source when the first light source is not short-circuited and drive the second light source when the first light source is short-circuited and that includes an output capacitor. The light-emitting element driving semiconductor integrated circuit has a controller configured to control the resistance value of a variable resistor connected in series with the first and second light sources according to the voltage across a resistor connected in series with the first and second light sources.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: February 18, 2020
    Assignee: Rohm Co., Ltd.
    Inventors: Koji Katsura, Yasunori Muramatsu
  • 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: 9980331
    Abstract: An oscillation circuit for generating a clock signal of a switching power supply circuit is provided. The oscillation circuit includes a circuit configured to perform frequency spreading control of the clock signal in synchronization with an output operation control signal for periodically turning on/off an output operation of the switching power supply circuit.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: May 22, 2018
    Assignee: ROHM CO., LTD.
    Inventors: Koji Katsura, Toru Takuma, Yasunori Muramatsu
  • Publication number: 20170305326
    Abstract: A light-emitting element driving semiconductor integrated circuit constitutes at least part of a light-emitting element driving device that is configured to drive a first and a second light source when the first light source is not short-circuited and drive the second light source when the first light source is short-circuited and that includes an output capacitor. The light-emitting element driving semiconductor integrated circuit has a controller configured to control the resistance value of a variable resistor connected in series with the first and second light sources according to the voltage across a resistor connected in series with the first and second light sources.
    Type: Application
    Filed: April 20, 2017
    Publication date: October 26, 2017
    Inventors: Koji Katsura, Yasunori MURAMATSU
  • Publication number: 20170041994
    Abstract: An oscillation circuit for generating a clock signal of a switching power supply circuit is provided. The oscillation circuit includes a circuit configured to perform frequency spreading control of the clock signal in synchronization with an output operation control signal for periodically turning on/off an output operation of the switching power supply circuit.
    Type: Application
    Filed: July 26, 2016
    Publication date: February 9, 2017
    Inventors: Koji KATSURA, Toru TAKUMA, Yasunori MURAMATSU
  • Patent number: 9333914
    Abstract: An LED short-circuit detection circuit produces an LED short-circuit detection signal by monitoring an LEDC terminal voltage (a first voltage obtained at a chip-to-chip node in a row of LED chips, or a divided voltage thereof) and an LEDR terminal voltage (a second voltage obtained by dividing the end-to-end voltage of the row of LED chips).
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: May 10, 2016
    Assignee: Rohm Co., Ltd.
    Inventor: Koji Katsura
  • Patent number: 9226350
    Abstract: An oscillation circuit includes: a ramp voltage generating unit configured to generate a ramp voltage; and a clock signal generating unit configured to generate a clock signal. The clock signal generating unit includes: a bias unit configured to apply one of the ramp voltage and a fixed voltage, as a bias voltage, to a resistor; and an oscillator configured to determine an oscillation frequency of the clock signal in response to a bias current flowing through the resistor.
    Type: Grant
    Filed: January 21, 2014
    Date of Patent: December 29, 2015
    Assignee: Rohm Co., Ltd.
    Inventor: Koji Katsura
  • Publication number: 20140203726
    Abstract: An oscillation circuit includes: a ramp voltage generating unit configured to generate a ramp voltage; and a clock signal generating unit configured to generate a clock signal. The clock signal generating unit includes: a bias unit configured to apply one of the ramp voltage and a fixed voltage, as a bias voltage, to a resistor; and an oscillator configured to determine an oscillation frequency of the clock signal in response to a bias current flowing through the resistor.
    Type: Application
    Filed: January 21, 2014
    Publication date: July 24, 2014
    Applicant: ROHM CO., LTD.
    Inventor: Koji Katsura
  • Publication number: 20120181931
    Abstract: An LED short-circuit detection circuit produces an LED short-circuit detection signal by monitoring an LEDC terminal voltage (a first voltage obtained at a chip-to-chip node in a row of LED chips, or a divided voltage thereof) and an LEDR terminal voltage (a second voltage obtained by dividing the end-to-end voltage of the row of LED chips).
    Type: Application
    Filed: January 13, 2012
    Publication date: July 19, 2012
    Applicant: ROHM CO., LTD.
    Inventor: Koji Katsura
  • Patent number: 7339050
    Abstract: This invention provides a stress-inducible promoter that effectively functions in monocotyledonous plants such as rice, and environmental stress-tolerant plants using the promoter. Such promoter is derived from rice and consists of the following DNA (a) or (b): (a) DNA that consists of the nucleotide sequence as shown in SEQ ID NO: 1 or 10; or (b) DNA that hybridizes under stringent conditions with DNA consisting of a nucleotide sequence that is complementary to the DNA consisting of the nucleotide sequence as shown in SEQ ID NO: 1 or 10 and that expresses stress-inducible promoter activity. Such environmental stress-tolerant plant has had such promoter introduced therein.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: March 4, 2008
    Assignee: Japan International Research Center for Agricultural Science
    Inventors: Kazuko Shinozaki, Koji Katsura, Yusuke Ito
  • Patent number: 7119192
    Abstract: The invention relates to an isolated stress-induced promoter which effectively functions in monocotyledonous plants such as rice, and of environmental stress tolerant plants using the promoter.
    Type: Grant
    Filed: March 18, 2003
    Date of Patent: October 10, 2006
    Assignee: Bio-oriented Technology Research Advancement Institution
    Inventors: Kazuko Shinozaki, Koji Katsura, Yusuke Ito
  • Publication number: 20060206966
    Abstract: This invention provides a stress-inducible promoter that effectively functions in monocotyledonous plants such as rice, and environmental stress-tolerant plants using the promoter. Such promoter is derived from rice and consists of the following DNA (a) or (b): (a) DNA that consists of the nucleotide sequence as shown in SEQ ID NO: 1 or 10; or (b) DNA that hybridizes under stringent conditions with DNA consisting of a nucleotide sequence that is complementary to the DNA consisting of the nucleotide sequence as shown in SEQ ID NO: 1 or 10 and that expresses stress-inducible promoter activity. Such environmental stress-tolerant plant has had such promoter introduced therein.
    Type: Application
    Filed: March 2, 2004
    Publication date: September 14, 2006
    Inventors: Kazuko Shinozaki, Koji Katsura, Yusuke Ito
  • Publication number: 20050278799
    Abstract: The invention relates to an isolated stress-induced promoter which effectively functions in monocotyledonous plants such as rice, and of environmental stress tolerant plants using the promoter.
    Type: Application
    Filed: March 18, 2003
    Publication date: December 15, 2005
    Applicants: Independent Administrative Inst. Japan Intr. Research Center For Agricultural Sciences, Bio-oriented Technology Research Advancement Institution
    Inventors: Kazuko Shinozaki, Koji Katsura, Yusuke Ito