Input switching in electronic watthour meter

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

1986-12-22

1988-08-02

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324127, G01R 2106, G01R 1918

Patent

active

047616059

ABSTRACT:
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 constant 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.

REFERENCES:
patent: 3916310 (1975-10-01), Stark et al.
patent: 4182982 (1980-01-01), Wolf et al.
patent: 4641105 (1987-02-01), Albaugh et al.

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