Electronic watt and watthour meter having analog and digital out

Details Electronic watt and watthour meter having analog and digital out Electronic watt and watthour meter having analog and digital out

1981-12-14

1984-11-27

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324107, 324130, G01R 2106, G01R 102

Patent

active

044853432

ABSTRACT:
An improved solid state semiconductor electronic combined watthour and watt meter circuit providing both analog and digital outputs and having automatic error correction comprising first and second input transformers for developing first and second signals proportional respectively to the voltage and current being supplied from a source of electrical energy to a consumer. The first and second signals are supplied to a multiplier circuit for developing pulse-width-modulated and amplitude modulated product output signals representative of instantaneous watts. This product signal is supplied to a summing analog-to-pulse rate circuit for developing an output pulse train wherein each output pulse represents a predetermined quantized amount of energy and which is used to reverse polarity of the multiplier switches to accomplish automatic error correction. Additional polarity reversing switches are included in the multiplier switching circuits for developing a second analog output signal representative of the total watts being consumed at a given time.

REFERENCES:
patent: 3889225 (1975-06-01), Pettersen
patent: 4224671 (1980-09-01), Sugiyama et al.

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