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:
Mar. 24, 1987
Filed:
Dec. 17, 1985
Lloyd E Matthews, Berwyn, IL (US);
Philip J Nowaczyk, Chicago, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A regulator for compensating for the IR drop of a rectifier coupled between the secondary winding of a transformer and a load circuit includes a pass transistor connected between the load circuit and the rectifier. A DC reference voltage is developed by a circuit connected across the secondary winding that is not subject to current fluctuations. A differential amplifier is supplied with the reference voltage as one input and the load voltage as another input. The output of the differential amplifier controls the conductivity of the pass transistor. A current limiting transistor is included in the base circuit of the pass transistor and, in turn, is controlled by another differential amplifier supplied with potentials representative of the IR drop across the rectifier. A shut down transistor is provided for cutting of the pass transistor in the event the load circuit voltage drops below a predetermined level.