Patents by Inventor Simon Mo Chan Ho

Simon Mo Chan Ho 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).

  • Surge and overcurrent limiting circuit for power converters
    Patent number: 5754419
    Abstract: Current flow between the boost inductor and the output bulk capacitor in a boost converter type power factor correction circuit for an AC-to-DC power converter is controlled by a single power MOSFET which is operated by a gate driver in a low-level constant current surge limiting mode during initial charging of the bulk capacitor, and in a high-level current-limiting mode once the bulk capacitor is sufficiently charged for normal operation. The power MOSFET gate driver is in turn controlled by a control logic which is connected to the input and output voltages of the boost converter, and which allows the circuit to cope with short circuits and input power interruptions and glitches.
    Type: Grant
    Filed: May 9, 1996
    Date of Patent: May 19, 1998
    Assignee: Astec International Limited
    Inventor: Simon Mo Chan Ho
  • Short circuit protection for power factor correction circuit
    Patent number: 5726845
    Abstract: In a power factor correction circuit using a control power MOSFET connected in series between the boost converter and the output, overcurrent damage to the power MOSFET upon occurrence of a short circuit in the output is prevented by sensing a drop in the output voltage below a predetermined level above the peak of the rectified AC boost converter input, and shutting the power MOSFET off when such a drop is sensed.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: March 10, 1998
    Assignee: Astec International Limited
    Inventor: Simon Mo Chan Ho