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. 02, 1984
Filed:
Dec. 23, 1981
Applicant:
Inventor:
Shunichi Kobayashi, Tokyo, JP;
Assignee:
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324142 ; 324107 ;
Abstract
An electronic watthour meter includes a power flow direction detector circuit which detects the power flow direction and a pulse width modulation circuit for converting a voltage signal proportional to the load voltage into a pulse signal. In accordance with the output of the power flow direction circuit, the polarity of the output signal of the pulse width modulation circuit is either inverted or not inverted. A multiplication circuit produces the product of the voltage signal proportional to the load voltage and a voltage signal proportional to the load current under the control of the output of the pulse modulation circuit.