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:
Oct. 25, 1977
Filed:
May. 14, 1976
Glenn A Mayfield, Columbus, OH (US);
Other;
Abstract
A watt/watthour meter of improved accuracy and relatively lower cost than a conventionally designed device with similar 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. The watt output amplifier is a current input, current output amplifier which simultaneously functions as an active ripple filter. It directly couples the input signal to the inverting input and capacitively couples the input ripple to the non-inverting input of the amplifier's op-amp. The output load, which is externally connected between the inverting input and the output of the op-amp, does not have a common with the internal ground and effectively floats with the ripple.