Input switching in electronic watthour meter

Details Input switching in electronic watthour meter Input switching in electronic watthour meter

G - Physics

01

R

324/59, 324/70

G01R 21/06 (2006.01) G01R 19/18 (2006.01)

Patent

CA 1285991

INPUT SWITCHING IN ELECTRONIC WATTHOUR METER ABSTRACT OF THE DISCLOSURE An electronic metering circuit includes a current transformer having active feedback for maintaining core flux near zero. In one embodiment of the invention, DC offset-voltage compensation in an operational amplifier providing the active- feedback signal is accomplished using an integrator having a long time cons ant compared to the time constant of periodic signals. A further embodiment of the invention integrates the functions of current sensing, DC offset-voltage compensation, and part of the switching function required in the electronic metering circuit.

561733

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