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. 30, 1997
Filed:
Feb. 23, 1996
Applicant:
Inventor:
Richard L Herring, Coconut Creek, FL (US);
Assignee:
Sensormatic Electronics Corporation, Boca Raton, FL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340572 ; 323355 ;
Abstract
A transmitter circuit drives a transmit antenna for an electronic article surveillance system with an alternating drive signal. The transmitter circuit includes a DC power supply which converts an AC input power signal into a DC power supply potential, a switching circuit which forms an alternating signal from the DC power supply potential, and a transformer which couples the alternating signal to the antenna. The transformer provides isolation for the transmit antenna, as well as voltage step-down to a desired amplitude for the antenna driving signal. The DC potential supplied to the switching circuit may be regulated or unregulated.