Patents by Inventor Wong Siu Chik

Wong Siu Chik 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).

  • Drive circuit for synchronous rectifiers in isolated forward converter
    Patent number: 6061255
    Abstract: A forward converter circuit that includes synchronous rectifiers as the forward and freewheeling rectifying elements in the output stage. The forward converter also includes a drive circuit for the synchronous rectifiers. The drive circuit includes an auxiliary secondary winding on the power transformer which is used to generate the gate control signal for the forward synchronous rectifier and an auxiliary winding on the output inductor which is used to generate the gate control signal for the freewheeling synchronous rectifier. An auxiliary switch is used to turn off the freewheeling rectifier, with the switch operating in response to the gate drive signal for the power switch.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: May 9, 2000
    Assignee: Astec International Limited
    Inventors: Wong Siu Chik, Wong Man Chuen