Patents by Inventor Yvjie Zhang

Yvjie Zhang 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).

  • LED indicator device for AC power plug or socket
    Patent number: 7855514
    Abstract: An LED indicator device is mounted in an AC power plug or socket and electrically connected in parallel with an AC power source. The LED indicator device includes a driving/current-limiting circuit to which an LED lighting circuit is coupled. The driving/current-limiting circuit includes a driving/current-limiting capacitor and a discharge resistor connected in parallel with the driving/current-limiting capacitor. The LED lighting circuit includes an LED, a protective instantaneous current-limiting resistor coupled to the LED, a rectifying diode connected in parallel with the LED, and a protective instantaneous voltage-limiting capacitor connected in parallel with the LED. The LED is lit to show the position and on/off state of the AC power plug or socket. Three LEDs emitting different colors and associated driving/current-limiting circuits and associated LED lighting circuits can be utilized to indicate incorrect power connection or short circuit of the AC power plug or socket.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: December 21, 2010
    Assignee: YFC-Boneagle Electric Co., Ltd.
    Inventors: Ying-Ming Ku, Chun-Mei Wu, Yvjie Zhang, Qiang Lu
  • LED Indicator Device for AC Power Plug or Socket
    Publication number: 20080290817
    Abstract: An LED indicator device is mounted in an AC power plug or socket and electrically connected in parallel with an AC power source. The LED indicator device includes a driving/current-limiting circuit to which an LED lighting circuit is coupled. The driving/current-limiting circuit includes a driving/current-limiting capacitor and a discharge resistor connected in parallel with the driving/current-limiting capacitor. The LED lighting circuit includes an LED, a protective instantaneous current-limiting resistor coupled to the LED, a rectifying diode connected in parallel with the LED, and a protective instantaneous voltage-limiting capacitor connected in parallel with the LED. The LED is lit to show the position and on/off state of the AC power plug or socket. Three LEDs emitting different colors and associated driving/current-limiting circuits and associated LED lighting circuits can be utilized to indicate incorrect power connection or short circuit of the AC power plug or socket.
    Type: Application
    Filed: March 7, 2008
    Publication date: November 27, 2008
    Inventors: Ying-Ming Ku, Chun-Mei Wu, Yvjie Zhang, Qiang Lu