The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 1996
Filed:
Sep. 12, 1994
Douglas L Anneser, Hollis, NH (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A transformer-based electrical circuit that isolates a low voltage level input control signal from a power switching device, such a MOSFET, is disclosed. The circuit includes a pair of complementary dual bipolar transistor configurations connected to the secondary winding of a pulse transformer. The low voltage input signal is connected to the primary winding of the transformer. A pair of resistor network transistor drivers connect to corresponding bipolar transistors, whose outputs connect to the gate terminal of the MOSFET. The drivers are also connected to the complementary transistor pairs. A resistive feedback network is connected between the gate terminal of the MOSFET and the complimentary transistor pairs. The feedback network latches the selected drive voltage to the gate of the MOSFET, thereby keeping it on or off irrespective of the fact that the pulse transformer may have saturated.