Electronic watt-hour meter with up and down integration for erro

Details Electronic watt-hour meter with up and down integration for erro Electronic watt-hour meter with up and down integration for erro

1989-02-07

1989-09-26

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324107, 324130, 364483, G01R 2100, G01R 21127

Patent

active

048703516

ABSTRACT:
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.

REFERENCES:
patent: 3875509 (1975-04-01), Milkovic
patent: 3955138 (1976-05-01), Milkovic
patent: 4066960 (1978-01-01), Milkovic
patent: 4315212 (1982-02-01), Gamoh
patent: 4451784 (1984-05-01), Milkovic
patent: 4475081 (1984-10-01), Kobayashi
patent: 4485343 (1984-11-01), Milkovic
patent: 4495463 (1985-01-01), Milkovic
patent: 4786863 (1988-11-01), Milkovic

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