Electronic watt transducer with constant d.c. current output...

Details Electronic watt transducer with constant d.c. current output... Electronic watt transducer with constant d.c. current output...

G - Physics

01

R

324/70

G01R 11/32 (2006.01) G01R 21/00 (2006.01)

Patent

CA 1187139

ABSTRACT OF THE DISCLOSURE A 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 watt. The electronic watt transducer circuit comprises a first transformer for developing a voltage related signal proportional to the input voltage to be measured and a second current transformer for developing a current related signal proportional to the input current to be measured. A pulse width modulator is connected to receive the voltage related signal and an input repetitive sampling signal for producing repetitive pulse width modulated output having instantaneous pulse width proportional to the corresponding instantaneous amplitude of the 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 voltage releated signal and instan- taneous amplitudes proportional to the 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.

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