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. 26, 2006
Filed:
Jan. 28, 2002
Scott R. Brown, Wake Forest, NC (US);
Mark J. Kocher, Raleigh, NC (US);
Roy S. Colby, Raleigh, NC (US);
Robert J. Dwulet, Wake Forest, NC (US);
Timothy B Phillips, Raleigh, NC (US);
Scott R. Brown, Wake Forest, NC (US);
Mark J. Kocher, Raleigh, NC (US);
Roy S. Colby, Raleigh, NC (US);
Robert J. Dwulet, Wake Forest, NC (US);
Timothy B Phillips, Raleigh, NC (US);
Square D Company, Palatine, IL (US);
Abstract
An economical digital voltage sag compensator for overcoming sags in distributed electrical power. The voltage sag compensator employs an inexpensive micro-controller, a full wave bridge rectifier, a DC power supply, a voltage divider and an output switch. The micro-controller continuously monitors and evaluates, with respect to a setpoint measured in volt-seconds, the rectified DC voltage. At regularly spaced trigger events, as determined by the micro-controller, the micro-controller concurrently monitors the rectified DC voltage, evaluates the monitored voltage with respect to the setpoint, produces an output signal and sends that output signal to the output switch. The output switch supplies an electrical device, connected electrically in series with the full wave bridge rectifier and the output switch, with a constant average current of sufficient level to maintain the electrical device in a desired operating condition. The constant average current is obtained by applying constant volt-seconds to the electrical device. The circuit also provides overvoltage protection to the electrical device.