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:
Aug. 17, 1976
Filed:
Dec. 13, 1974
Glenn A Mayfield, Columbus, OH (US);
Esterline Corporation, New York, NY (US);
Abstract
A watt/watthour meter of improved accuracy and relatively lower cost than a conventionally designed device with smilar specifications. A current proportional to instantaneous power is obtained from a current-voltage multiplier circuit and is maintained as a current signal through amplifying and filtering and through the watt output load and through integrating in the watthour section. The watthour integrator uses a charge compensation integrator circuit to integrate one of the watt signal currents and it can integrate in either direction corresponding to power in or power out. This can be accomplished because circuitry is disclosed to provide a current pulse having a precise magnitude and in either of two alternative, opposite current flow directions. The magnitude of the current pulse in both directions is referenced from the same reference voltage and reference resistance and its duration is referenced from the same timer so that an identical quantum of charge may be either added to or removed from the integrator depending upon the direction of power flow.