Electronic wattmeter

Details Electronic wattmeter Electronic wattmeter

1974-07-22

1976-05-25

Chatmon, Jr., Saxfield

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324140R, 307265, 328160, 235194, G01R 700, G01R 1132, G06G 7161, H03K 118

Patent

active

039597245

ABSTRACT:
An electronic wattmeter (transducer) to measure the average power to a load or on an electric power line includes a current transformer, a voltage transformer and a power transformer, the primary coil of each transformer being connected to the power line. The secondary coil of the current transformer is connected to a modulator so that changes in current vary the duty cycle, i.e., zero crossings, of a duty cycle modulator-oscillator. The modulator and the secondary of the voltage transformer are connected to an electronic switch whose switchings are controlled by the zero crossings of the oscllator's pulses whose output is a pulse train in which the pulses vary in width dependent upon current and vary in amplitude dependent upon voltage. The switch is connected to a filter whose output is a d.c. voltage which is proportional to the average electric power on the line.

REFERENCES:
patent: 3760273 (1973-09-01), Burkett et al.
patent: 3780273 (1973-12-01), Turrell

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