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. 07, 1978
Filed:
Aug. 15, 1977
Applicant:
Inventor:
Jan Petr, Zug, CH;
Assignee:
LGZ Landis & Gyr Zug AG, Zug, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
328151 ; 307261 ; 307271 ; 307362 ; 328128 ;
Abstract
An analog to frequency convertor for developing an output signal of frequency proportional to a measuring current or voltage by the charge quantity compensation method, comprising an integrator, a threshold switch downstream thereof, a compensating charge transmitter which supplies a constant compensating charge to a capacitor of the integrator each time the threshold switch responds, and a control circuit to generate a periodic digital polarity signal which controls the polarity of the measuring current or voltage and of the compensating charge transmitter and always changes its logic value at the same level of the output voltage of the integrator.