Patents by Inventor Jyunichi Nagata

Jyunichi Nagata 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).

  • Electric power supply apparatus having input switching circuit
    Patent number: 7106031
    Abstract: In a power supply apparatus, a switching circuit selectively applies one of an input voltage of a power converting circuit and an output voltage of the power converting circuit to a voltage reducing power supply circuit. When the input voltage is applied to the power converting circuit, the switching circuit selects this input voltage, so that the output voltage of the voltage reducing power supply circuit can quickly rise. Thereafter, when the output voltage of the power converting circuit exceeds this output voltage, the switching circuit selects the output voltage of the power converting circuit. As a result, a difference between the input voltage and the output voltage of the voltage reducing power supply circuit is decreased. Thus, a power loss is lowered and noise produced in the power converting circuit is suppressed.
    Type: Grant
    Filed: February 10, 2005
    Date of Patent: September 12, 2006
    Assignee: Denso Corporation
    Inventors: Junji Hayakawa, Hiroyuki Ban, Jyunichi Nagata
  • Electric power supply apparatus having input switching circuit
    Publication number: 20050206323
    Abstract: In a power supply apparatus, a switching circuit selectively applies one of an input voltage of a power converting circuit and an output voltage of the power converting circuit to a voltage reducing power supply circuit. When the input voltage is applied to the power converting circuit, the switching circuit selects this input voltage, so that the output voltage of the voltage reducing power supply circuit can quickly rise. Thereafter, when the output voltage of the power converting circuit exceeds this output voltage, the switching circuit selects the output voltage of the power converting circuit. As a result, a difference between the input voltage and the output voltage of the voltage reducing power supply circuit is decreased. Thus, a power loss is lowered and noise produced in the power converting circuit is suppressed.
    Type: Application
    Filed: February 10, 2005
    Publication date: September 22, 2005
    Inventors: Junji Hayakawa, Hiroyuki Ban, Jyunichi Nagata