G - Physics – 01 – R
Patent
G - Physics
01
R
328/5, 324/70
G01R 21/127 (2006.01) G08C 19/22 (2006.01) H03K 7/08 (2006.01)
Patent
CA 1295369
ELECTRONIC WATTHOUR METER WITH UP AND DOWN INTEGRATION FOR ERROR CORRECTION ABSTRACT OF THE DISCLOSURE An electronic watthour meter employs a first analog signal representing either a load current or voltage to pulse-width-modulate a second analog signal representing the other of the load current or voltage. The resulting signal contains a DC component proportional to the product of current and voltage. AC components are removed from the product signal in an integrator before applying the DC component to a threshold circuit. The threshold circuit alternates its output between positive and negative values each time the DC component of the product signal passes through a predetermined positive and negative value. This pulsed signal is transmitted to a register for integrating the energy usage. A pulse-width modulator produces a constant-frequency pulsed output whose positive and negative alternations have lengths which are proportional to the line signal it receives. At each alternation of the pulsed signal, the output of the pulse-width modulator alternates between a direct and an inverted signal. Thus, integration is driven in alternate directions, whereby offset signals of active circuits are balanced out.
569668
Company General Electric
Oldham And Wilson
LandOfFree
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