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:
May. 07, 1991
Filed:
Dec. 11, 1989
Paul E Nuechterlein, Rockford, IL (US);
Sundstrand Corporation, Arlington Heights, IL (US);
Abstract
A snubber circuit for a power switch includes a capacitor coupled across main current path electrodes of the switch, an inductor having a first end coupled to one of the main current path electrodes of the power switch and a second end and a controllable switch having a first main current path electrode coupled to the second end of the inductor, a second main current path electrode coupled to the other main current path electrode of the power switch and a control electrode. A control circuit is coupled to the power switch and the controllable switch and turns on the controllable switch when a gating signal is commanding turn-on of the power switch and the voltage across the main current path electrodes of the power switch is above a certain level so that the capacitor is discharged through the inductor at such time. The control circuit subsequently turns off the controllable switch and turns on the power switch while the gating signal is commanding turn-on of the latter switch when the voltage across the main current path electrodes thereof falls below the certain level.