Patents Examined by Sameul Berhanu
  • Charging circuit for secondary battery
    Patent number: 7274171
    Abstract: A charging circuit for a secondary battery includes a constant-voltage circuit part outputting one of a plurality of predetermined constant voltages and charges the secondary battery by applying the constant voltage thereto, a detection circuit part detecting a battery voltage of the secondary battery, and a control circuit part controlling the selection of the constant-voltage in response to the detected battery voltage.
    Type: Grant
    Filed: December 7, 2005
    Date of Patent: September 25, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Junji Nishida, Shinya Manabe