Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1981-10-21
1984-05-29
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324107, 324111, G01R 700
Patent
active
044517840
ABSTRACT:
An electronic wattmeter in the form of an electronic watt-transducer circuit requiring a minimum number of components that can be fabricated by monolithic semiconductor integrated circuit manufacturing techniques and which provides a direct current output signal that is proportional to watts. The electronic watt transducer circuit comprises a first transformer for developing a first voltage related signal proportional to the input voltage to be measured and a second current transformer for developing a second current related signal proportional to the input current to be measured. A pulse width modulator is connected to receive the first voltage related signal and an input repetitive sampling signal for producing repetitive pulse width modulated output pulses having instantaneous pulse width proportional to the corresponding instantaneous amplitude of the first voltage related signal. Double-pole, double-throw electronic switch multipliers are connected to be automatically switched in response to the repetitive pulse width modulated output signal to develop at the output thereof alternating polarity, pulse width and amplitude modulated signal pulses having instantaneous pulse widths proportional to the first voltage related signal and instantaneous amplitudes proportional to the second current related signal, and a DC component proportional to the product of the two and hence to the power consumption represented by the electric voltage and current being monitored. An averaging type current-to-current converter is connected to the output from the electronic switch multiplier for providing an output analog average direct current electric signal proportional to watts.
REFERENCES:
patent: 3746851 (1973-07-01), Gilbert
patent: 3875509 (1975-04-01), Milkovic
patent: 3947763 (1976-03-01), Milkovic
patent: 3955138 (1976-05-01), Milkovic
patent: 4145652 (1979-03-01), Hayashi
Brunson Robert E.
General Electric Company
Levy Stewart J.
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