Patents by Inventor Pierre S. Thollot

Pierre S. Thollot 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).

  • Proportional base drive circuit for transistorized bridge inverter
    Patent number: 4651267
    Abstract: A proportional base drive circuit which overcomes the problems of the prior art relative to relatively long turn-off time of power switches in an inverter and the absence of protection circuitry therefor includes a current transformer having a primary winding coupled to a main current electrode of a pair of power switches and first and second secondary windings each of which develops regenerative currents proportional to load current. First and second auxiliary switches are coupled between the secondary windings and the control electrodes of the power switches. Means are included for operating the auxiliary switches in synchronism with the power switches so that the power switches operate in rapid fashion. Means are also included for disabling the power switches when an overcurrent condition is sensed.
    Type: Grant
    Filed: June 14, 1985
    Date of Patent: March 17, 1987
    Assignee: Sundstrand Corporation
    Inventors: Vietson M. Nguyen, P. John Dhyanchand, Pierre S. Thollot