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:
Sep. 05, 2017
Filed:
Apr. 22, 2015
Emerson Electric Co., St. Louis, MO (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
A driving circuit includes a relay driver for selectively connecting a relay coil with (a) a first current path between the relay driver and a relay voltage input or (b) a second current path between the relay driver and a ground connection. Another relay driver selectively connects the coil with (a) a third current path between the other relay driver and the relay voltage input or (b) a fourth current path between the other relay driver and the ground connection. The relay drivers may connect the coil between the second and third current paths for latching the relay, and between the first and fourth current paths for unlatching the relay. The driving circuit applies signals of opposite polarity and different magnitudes through the coil to latch and unlatch the relay. The signal for unlatching can be of lower voltage than the signal for latching the relay.