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. 22, 2009
Filed:
Apr. 03, 2008
Bartholomew L. Toth, St. Louis, MO (US);
Bartholomew L. Toth, St. Louis, MO (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
A microprocessor-based control system is provided that comprises a plurality of latching relays, at least some of which may be connected in parallel. A momentary application of voltage of a first polarity or a second polarity to the coil causes the latching relay contacts to switch and remain in an open or closed state respectively. An individual relay driver circuit is provided for a corresponding latching relay or set of latching relays, and has a first and second switch that respectively apply a voltage or a ground connection to a first end of each coil corresponding to the individual relay driver. The control system includes a common relay driver connected to at least one of the latching relays for each relay drive circuit, and has a first and second switch that respectively apply a voltage or a ground connection to the second end of the latching relay coils connected to the common relay driver circuit.