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:
Dec. 10, 1991
Filed:
May. 22, 1990
Joseph M Zias, Cuba, NY (US);
Acme Electric Corporation, East Aurora, NY (US);
Abstract
Two SCR full-wave center-tapped rectifiers are connected in opposite polarity to battery charging terminals. The proper polarity rectifier is selected by a battery polarity sensing circuit that enables the firing of the SCRs of the proper rectifier. The sensing circuit has two transistors of opposite polarity. The transistor matching the polarity of the battery turns on and enables current to the proper SCR gates. The sensing circuit is controlled by an optical isolator that activates the circuit by shorting the polarized output of a diode bridge connected in the transistors's emitter circuit. This allows the optical isolator to control emitter current of either polarity.