Patents by Inventor Qikang Chen

Qikang Chen 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).

  • Input detecting circuit used for electric-leakage protection devices with self-diagnostic function
    Patent number: 7598754
    Abstract: An input detecting circuit for an electric-leakage protection device with self-diagnostic function includes an analog electric-leakage unit, a magnetic electric-leakage induction ring, an operational amplifier, and an inverse feedback circuit. The inverse feedback circuit includes a first resistance and a second circuit unit shunted with the first resistance. The second circuit unit includes a second resistance and a unidirectional break-over unit connected in series with the second resistance.
    Type: Grant
    Filed: June 18, 2007
    Date of Patent: October 6, 2009
    Assignee: Shanghai Fudan Microelectronics Co., Ltd.
    Inventors: Jun Yu, Qikang Chen
  • INPUT DETECTING CIRCUIT USED FOR ELECTRIC-LEAKAGE PROTECTION DEVICES WITH SELF-DIAGNOSTIC FUCNTION
    Publication number: 20080048667
    Abstract: An input detecting circuit for an electric-leakage protection device with self-diagnostic function includes an analog electric-leakage unit, a magnetic electric-leakage induction ring, an operational amplifier, and an inverse feedback circuit. The inverse feedback circuit includes a first resistance and a second circuit unit shunted with the first resistance. The second circuit unit includes a second resistance and a unidirectional break-over unit connected in series with the second resistance.
    Type: Application
    Filed: June 18, 2007
    Publication date: February 28, 2008
    Applicant: SHANGHAI FUDAN MICROELECTRONICS CO., LTD.
    Inventors: Jun YU, Qikang Chen