Transformerless kilowatthour meter for an electrical power line

Details Transformerless kilowatthour meter for an electrical power line Transformerless kilowatthour meter for an electrical power line

1974-09-26

1976-04-27

Chatmon, Jr., Saxfield

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

235194, 328158, 328160, G01R 700, G01R 1132

Patent

active

039537951

ABSTRACT:
This invention is an electronic kilowatthour meter with a time-division multiplier, wherein a proportional first current is derived from the load voltage without a voltage transformer and a proportional second current is derived by means of an inverting amplifier, with a polarity opposite to that of the first current and instantaneous values halved as compared to the first current, and that the first current is added to the second current in one of two switching conditions by means of a switch which is operated by a pulse width-frequency modulator controlled by the load current, so that the average value of the sum current is proportional to the product of the load current and the load voltage.

REFERENCES:
patent: 3500200 (1970-03-01), Woodhead
patent: 3746851 (1973-07-01), Gilbert
patent: 3760273 (1973-09-01), Burkett et al.
patent: 3818340 (1974-06-01), Yamaguchi

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