Patents by Inventor Hideyuki Tajima

Hideyuki Tajima 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: 20160248325
    Abstract: According to one embodiment, a DC-DC converter 1 includes a power supply unit 12 that includes an inductor L1 and a switching unit and generates an output voltage Vout corresponding to a duty of a pulse signal P1, a PID controller 111 that outputs a control signal S corresponding to a difference between a divided voltage of Vout and a target voltage Vcnst, a PI controller 112 that outputs a control signal D corresponding to a difference between the control signal S and an average current flowing through the inductor L1, a PWM generation unit 113 that generates the pulse signal P1 with a duty ratio corresponding to the control signal D, and in step-down mode, the PI controller 112 performs proportional control of the differential signal ei by using a product of the control signal D and a reference proportionality constant KP as a proportionality constant.
    Type: Application
    Filed: January 8, 2016
    Publication date: August 25, 2016
    Applicant: Renesas Electronics Corporation
    Inventor: Hideyuki Tajima
  • Patent number: 8152371
    Abstract: In a temperature sensor circuit, a temperature sensor is configured to output a first voltage corresponding to temperature. A voltage source is configured to output a second voltage having the same nonlinear dependence on the temperature as a nonlinear dependence of the first voltage on the temperature. An amplifier is configured to amplify the second voltage with a first amplification factor to output a third voltage. An inversion amplifier is configured to perform inversion amplification on a difference between the first voltage and the third voltage with a second amplification factor to output a fourth voltage.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: April 10, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Hideyuki Tajima
  • Publication number: 20090256623
    Abstract: In a temperature sensor circuit, a temperature sensor is configured to output a first voltage corresponding to temperature. A voltage source is configured to output a second voltage having the same nonlinear dependence on the temperature as a nonlinear dependence of the first voltage on the temperature. An amplifier is configured to amplify the second voltage with a first amplification factor to output a third voltage. An inversion amplifier is configured to perform inversion amplification on a difference between the first voltage and the third voltage with a second amplification factor to output a fourth voltage.
    Type: Application
    Filed: April 10, 2009
    Publication date: October 15, 2009
    Inventor: Hideyuki Tajima
  • Patent number: 6618927
    Abstract: A sensing element, disposed in a housing, has a gas contact portion exposed to a measured gas. A protective cover extends from a distal end of the housing so as to surround the gas contact portion of the sensing element. A first metallic cover surrounds signal output terminals and leads connected to the sensing element. In manufacturing the first metallic cover, a shot blasting is applied to a surface of a semi-finished product of the first metallic cover.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: September 16, 2003
    Assignee: Denso Corporation
    Inventors: Hideyuki Tajima, Norihiko Nakano
  • Publication number: 20020000033
    Abstract: A sensing element, disposed in a housing, has a gas contact portion exposed to a measured gas. A protective cover extends from a distal end of the housing so as to surround the gas contact portion of the sensing element. A first metallic cover surrounds signal output terminals and leads connected to the sensing element. In manufacturing the first metallic cover, a shot blasting is applied to a surface of a semi-finished product of the first metallic cover.
    Type: Application
    Filed: June 21, 2001
    Publication date: January 3, 2002
    Inventors: Hideyuki Tajima, Norihiko Nakano