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:
Nov. 30, 1999
Filed:
Apr. 07, 1998
Frank Dropps, Maple Grove, MN (US);
Angeion Corporation, Brooklyn Park, MN (US);
Abstract
A magnetic sensing circuit is arranged in cooperative relation to a flyback transformer in a capacitor charging circuit for directly sensing the state of the transformer magnetic field for controlling the switching of power to the primary winding of the flyback transformer. A first threshold is sensed when the flyback transformer is nearly saturated with magnetic energy storage. A second threshold is sensed when all of the magnetic energy stored in the flyback transformer has been transferred to the capacitor. The sensed thresholds are used to optimally control the switching of power to the primary winding to maximize the efficiency and minimize the charging time of the capacitor charging circuit. A capacitor charging circuit which utilizes the present invention can be part of an implantable cardioverter defibrillator.