Patents by Inventor Mitsuru Nomizo

Mitsuru Nomizo 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).

  • Power supply apparatus for discharge lamp and control method for the same
    Patent number: 7317286
    Abstract: An apparatus supplies power to at least one discharge lamp. The apparatus includes a buck converter for regulating power supplied to at least one discharge lamp having a switching element driven by PWM pulses, and a control unit for supplying PWM pulses to the buck converter. The control unit includes a function for controlling an output power of the buck converter so as to be constant using PWM pulses of a first frequency; and a function for controlling an output voltage of the buck converter so as to be maximum using PWM pulses of a second frequency that is lower than the first frequency. The buck converter is capable of operating in discontinuous mode based on the PWM pulses of the second frequency.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: January 8, 2008
    Assignee: Rubycon Corporation
    Inventor: Mitsuru Nomizo
  • Power supply apparatus for discharge lamp and control method for the same
    Publication number: 20070176565
    Abstract: An apparatus supplies power to at least one discharge lamp. The apparatus includes a buck converter for regulating power supplied to at least one discharge lamp having a switching element driven by PWM pulses, and a control unit for supplying PWM pulses to the buck converter. The control unit includes a function for controlling an output power of the buck converter so as to be constant using PWM pulses of a first frequency; and a function for controlling an output voltage of the buck converter so as to be maximum using PWM pulses of a second frequency that is lower than the first frequency. The buck converter is capable of operating in discontinuous mode based on the PWM pulses of the second frequency.
    Type: Application
    Filed: November 20, 2006
    Publication date: August 2, 2007
    Applicant: RUBYCON CORPORATION
    Inventor: Mitsuru Nomizo