Patents by Inventor Jenn-Jong Shieh

Jenn-Jong Shieh 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 capable of reducing low-frequency secondary-side common-mode voltage
    Patent number: 7554825
    Abstract: The invention discloses a switching power supply capable of reducing a low-frequency secondary-side common-mode voltage. The power supply mainly has two common-mode filtering circuit devices to prevent an AC voltage and an AC current from coupling to a secondary side of a transformer. Thus, the electrical safety and the quality in use of the associated electronic apparatus can be enhanced, a potential difference between the electronic apparatus and the ground may be greatly reduced, and an AC hum of a speaker coupled to an output of the power supply may be reduced or even eliminated.
    Type: Grant
    Filed: December 4, 2006
    Date of Patent: June 30, 2009
    Assignee: Jentec Technology Co., Ltd.
    Inventors: Yuan-Cheng Chuang, Chun-Teh Chen, Ying-Chieh Lin, Jenn-Jong Shieh
  • Power supply capable of reducing secondary-side noise
    Publication number: 20090010032
    Abstract: A switching power supply capable of reducing secondary-side noise mainly has at least one decoupling device for guiding the secondary-side noise to at least a terminal of an AC power supply. Thus, the secondary-side high-frequency noise can be reduced, and the quality in using the electronic apparatus product, which is electrically connected to the output of the switching AC-to-DC power supply, can be greatly enhanced.
    Type: Application
    Filed: June 11, 2008
    Publication date: January 8, 2009
    Inventors: Weber Chuang, Charles Huang, Jack Lee, Jenn-Jong Shieh
  • Switching power supply capable of reducing low-frequency secondary-side common-mode voltage
    Publication number: 20070127275
    Abstract: The invention discloses a switching power supply capable of reducing a low-frequency secondary-side common-mode voltage. The power supply mainly has two common-mode filtering circuit devices to prevent an AC voltage and an AC current from coupling to a secondary side of a transformer. Thus, the electrical safety and the quality in use of the associated electronic apparatus can be enhanced, a potential difference between the electronic apparatus and the ground may be greatly reduced, and an AC hum of a speaker coupled to an output of the power supply may be reduced or even eliminated.
    Type: Application
    Filed: December 4, 2006
    Publication date: June 7, 2007
    Inventors: Yuan-Cheng Chuang, Chun-Teh Chen, Ying-Chieh Lin, Jenn-Jong Shieh