Patents by Inventor Bram Melse

Bram Melse 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).

  • Overvoltage protection for SMPS based on demagnetization signal
    Patent number: 5784231
    Abstract: An overvoltage protection circuit is provided for a switched-mode power supply of the type having a transformer with a primary winding, an auxiliary winding, and a secondary winding, with a switching transistor coupled in series with the primary winding. The overvoltage protection circuit includes a sensing resistor having a first terminal directly connected to the auxiliary winding for generating a current proportional to the voltage across the auxiliary winding, with a second terminal of this resistor being coupled to an input of a current mirror. The reflected current output of the current mirror is compared to an overvoltage reference current generated by an overvoltage reference current source by means of a current comparator, and a circuit is provided to generate a signal to turn off the switching transistor when the reflected current exceeds the overvoltage reference current.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: July 21, 1998
    Assignee: Philips Electronics North America Corp.
    Inventors: Naveed Majid, Bram Melse, Erwin Seinen