Patents by Inventor Syouhei Osaka

Syouhei Osaka 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).

  • Converter with start-up circuit
    Patent number: 7221128
    Abstract: A converter is provided in which the cost and size of which are reduced by a decrease in current consumption with no need of large elements or radiation fins. The converter has a switching element (Q1) being connected to a DC power source through a primary winding (P) of a transformer (T), a control circuit (4) for turning on/off the switching element (Q1), a diode (D51) and a capacitor (C51) for rectifying/smoothing the voltage induced in the secondary winding (S) of the transformer (T) to extract DC output, and a starting circuit (5) for starting the control circuit (4). The starting circuit (5) operates as a constant current circuit (Q2, R1, R2, ZD1, D1) while starting the control circuit (4), and as a constant voltage circuit (Q2, R1, R2, ZD2, D1) after starting the control circuits (4).
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: May 22, 2007
    Assignee: Sanken Electric Co., Ltd.
    Inventors: Hiroshi Usui, Yukinari Fukumoto, Yasuhiro Rikiishi, Syouhei Osaka
  • Converter
    Publication number: 20050201123
    Abstract: A converter is provided in which the cost and size of which are reduced by a decrease in current consumption with no need of large elements or radiation fins. The converter has a switching element (Q1) being connected to a DC power source through a primary winding (P) of a transformer (T), a control circuit (4) for turning on/off the switching element (Q1), a diode (D51) and a capacitor (C51) for rectifying/smoothing the voltage induced in the secondary winding (S) of the transformer (T) to extract DC output, and a starting circuit (5) for starting the control circuit (4). The starting circuit (5) operates as a constant current circuit (Q2, R1, R2, ZD1, D1) while starting the control circuit (4), and as a constant voltage circuit (Q2, R1, R2, ZD2, D1) after starting the control circuits (4).
    Type: Application
    Filed: May 28, 2003
    Publication date: September 15, 2005
    Inventors: Hiroshi Usui, Yukinari Fukumoto, Yasuhiro Rikiishi, Syouhei Osaka