Patents by Inventor Shigeta Akiyama

Shigeta Akiyama 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).

  • SWITCHING POWER SUPPLY CIRCUIT PROVIDED WITH PROTECTION FUNCTION
    Publication number: 20130170621
    Abstract: The present invention includes: a transformer having a primary winding, a secondary winding and a tertiary winding; a primary-side rectifying and smoothing circuit, which converts alternating-current power to direct-current power and smoothes the power; a secondary-side rectifying and smoothing circuit, which smoothes secondary-side power; a tertiary-side rectifying and smoothing circuit, which smoothes power of the tertiary winding; a switching circuit, which opens and closes the primary winding; a pulse width control circuit, which controls the pulse width of drive signals that control the opening and closing of the switching circuit; and a secondary-side electrolytic capacitor deterioration detecting circuit, which detects deterioration of the secondary-side electrolytic capacitor.
    Type: Application
    Filed: September 2, 2011
    Publication date: July 4, 2013
    Applicant: I-O DATA DEVICE INC
    Inventors: Takashi Saka, Shigeta Akiyama, Kazuhiro Matsuda, Katsuichiro Otsuka