Patents by Inventor Kohiji Yoshii

Kohiji Yoshii 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 circuit
    Patent number: 8004254
    Abstract: A power supply circuit includes a first voltage regulator, a second voltage regulator, and a voltage comparator. The first voltage regulator is connected to a direct current power supply, and regulates a direct current supply voltage down to a first voltage level to output a first voltage at a first output terminal. The second voltage regulator is connected to the first voltage regulator, and regulates the first output voltage down to a constant, second voltage level to output a second voltage at a second output terminal. The voltage comparator is connected to the first and second voltage regulators, compares the first output voltage against a given threshold level greater than the second voltage level, and deactivates the second voltage regulator until the first output voltage exceeds the given threshold level upon startup of the power supply circuit.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: August 23, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideki Agari, Kohiji Yoshii
  • POWER SUPPLY CIRCUIT
    Publication number: 20090206813
    Abstract: A power supply circuit includes a first voltage regulator, a second voltage regulator, and a voltage comparator. The first voltage regulator is connected to a direct current power supply, and regulates a direct current supply voltage down to a first voltage level to output a first voltage at a first output terminal. The second voltage regulator is connected to the first voltage regulator, and regulates the first output voltage down to a constant, second voltage level to output a second voltage at a second output terminal. The voltage comparator is connected to the first and second voltage regulators, compares the first output voltage against a given threshold level greater than the second voltage level, and deactivates the second voltage regulator until the first output voltage exceeds the given threshold level upon startup of the power supply circuit.
    Type: Application
    Filed: February 18, 2009
    Publication date: August 20, 2009
    Applicant: RICOH COMPANY, LTD
    Inventors: Hideki AGARI, Kohiji YOSHII