Patents by Inventor Kelichi Ashida

Kelichi Ashida 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).

  • Method and charge-up circuit capable of adjusting charge-up current
    Patent number: 8274259
    Abstract: A charge-up circuit includes a charge-up transistor configured to supply a charge-up current to a secondary battery in accordance with a control signal, a detection resistor connected in series with the charge-up transistor to detect the charge-up current, a current-to-voltage conversion circuit configured to generate and output a monitor voltage in accordance with the charge-up current based on each voltage at both end terminals of the detection resistor, a reference voltage generator configured to generate a predetermined reference voltage and including a voltage adjusting mechanism to generate the reference voltage from the constant voltage so that the charge-up current becomes a desired current, and a charge-up current control circuit configured to control the charge-up transistor so that the monitor voltage becomes the reference voltage.
    Type: Grant
    Filed: August 11, 2008
    Date of Patent: September 25, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Kelichi Ashida
  • METHOD AND CHARGE-UP CIRCUIT CAPABLE OF ADJUSTING CHARGE-UP CURRENT
    Publication number: 20090051329
    Abstract: A charge-up circuit includes a charge-up transistor configured to supply a charge-up current to a secondary battery in accordance with a control signal, a detection resistor connected in series with the charge-up transistor to detect the charge-up current, a current-to-voltage conversion circuit configured to generate and output a monitor voltage in accordance with the charge-up current based on each voltage at both end terminals of the detection resistor, a reference voltage generator configured to generate a predetermined reference voltage and including a voltage adjusting mechanism to generate the reference voltage from the constant voltage so that the charge-up current becomes a desired current, and a charge-up current control circuit configured to control the charge-up transistor so that the monitor voltage becomes the reference voltage.
    Type: Application
    Filed: August 11, 2008
    Publication date: February 26, 2009
    Applicant: RICOH COMPANY, LTD.
    Inventor: Kelichi ASHIDA