Patents by Inventor Nelson C. Lai

Nelson C. Lai 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).

  • Method and circuit for current limiting of DC-DC regulators
    Patent number: 5892389
    Abstract: A method and circuit (10) for limiting current (I.sub.COIL) in a load (16). The current limiting circuit (10) includes a sensing circuit (12) having a current indicator output terminal (20) connected to an inverting input of a comparator (11). A reference voltage node (24) of a reference voltage generator (13) is connected to the non-inverting input of the comparator (11). The comparator (11) generates an output signal in accordance with the current flowing in the load (16). If an overcurrent condition exists, the signal from the comparator (11) disables a control circuit (14) which turns off the sensing circuit (12). With the control circuit (14) disabled and sensing circuit (14) off, the current (I.sub.COIL) is prevented from flowing through the load (16).
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: April 6, 1999
    Assignee: Motorola, Inc.
    Inventor: Nelson C. Lai