Patents by Inventor Haruka KINOSHITA

Haruka KINOSHITA 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).

  • Light source lighting device including a constant-current supply that is connected to a light source and supplies a constant current of a substantially constant magnitude to the light source, and luminaire
    Patent number: 8710750
    Abstract: A power supply circuit drives circuits having different numbers of series-connected LEDs without changing a circuit constant or a component. An LED series circuit is connected to a power converter circuit of a power supply circuit. The power converter circuit is controlled by a control arithmetic circuit, and supplies a constant current to the LED series circuit. A voltage detection circuit detects a voltage applied to the LED series circuit. The control arithmetic circuit checks whether the LED series circuit has 40 LEDs or 20 LEDs, based on the voltage detected by the voltage detection circuit. The control arithmetic circuit holds a constant-current value table for 40 LEDs and a constant-current value table for 20 LEDs. In accordance with the detected voltage, the control arithmetic circuit selects one constant-current value table, and controls the power converter circuit based on the constant-current value table selected.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: April 29, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takafumi Nonaka, Takashi Kumagai, Yuichiro Ito, Haruka Kinoshita, Shinsuke Funayama, Takashi Maeda
  • LIGHT SOURCE LIGHTING DEVICE AND LUMINAIRE
    Publication number: 20120187863
    Abstract: A power supply circuit drives circuits having different numbers of series-connected LEDs without changing a circuit constant or a component. An LED series circuit is connected to a power converter circuit of a power supply circuit. The power converter circuit is controlled by a control arithmetic circuit, and supplies a constant current to the LED series circuit. A voltage detection circuit detects a voltage applied to the LED series circuit. The control arithmetic circuit checks whether the LED series circuit has 40 LEDs or 20 LEDs, based on the voltage detected by the voltage detection circuit. The control arithmetic circuit holds a constant-current value table for 40 LEDs and a constant-current value table for 20 LEDs. In accordance with the detected voltage, the control arithmetic circuit selects one constant-current value table, and controls the power converter circuit based on the constant-current value table selected.
    Type: Application
    Filed: October 17, 2011
    Publication date: July 26, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takafumi NONAKA, Takashi KUMAGAI, Yuichiro ITO, Haruka KINOSHITA, Shinsuke FUNAYAMA, Takashi MAEDA