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:
Nov. 29, 1988
Filed:
Jan. 09, 1985
Applicant:
Inventor:
Eric Faulkner, Cookham Dean, GB;
Assignee:
Refac Electronics Corporation, Winsted, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324142 ; 364841 ;
Abstract
Apparatus for measuring the mean value of instantaneous power supplied to an electrical device computes the product of two voltage signals each proportional to the instantaneous voltage and current respectively. A self-biasing current source generates a DC signal current proportional to the magnitude of one voltage signal with a mean value equal to one-half the peak-to-peak magnitude of the voltage signal. A log-antilog multiplier circuit computes the product of the DC current signal and the other input voltage signal. A current mirror connected to the multiplier cancels DC offset currents to improve accuracy of the apparatus.