Patents by Inventor Man Sing Tse

Man Sing Tse 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).

  • In-rush current controller with continuous cycle-by-cycle control
    Patent number: 6297979
    Abstract: An in-rush current controller for a mains power rectification circuit including a fill wave rectifier and a capacitor. A serial resistor suppresses in-rush currents. The controller includes a sensing circuit that controls a pair of silicon controlled rectifiers to cyclically shunt or isolate the resistor during normal operation. Thus, power is not dissipated by the resistor and undesirable heat is not generated during normal operation. The sensing circuit responds to abrupt rises in voltage (typical of in-rush current conditions) to inhibit turn ON of the rectifiers so that the resistor is not shunted or isolated at such times.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: October 2, 2001
    Assignee: PI Electronics (Hong Kong) Limited
    Inventor: Man Sing Tse