Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1974-11-06
1976-01-20
Smith, Alfred E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324141, G01R 1132
Patent
active
039341984
ABSTRACT:
The metering of kilowatt hours in a single phase, three wire electrical system is accomplished by generating a first analog voltage which is representative of the voltage of the power consuming system. Second and third analog signals are generated which represent the current flowing through each of two of the three wires of the single phase power consuming system. The voltage representative analog signal is multiplied by each of the second and third current representative analog signals in either a direct pulse width amplitude multiplying network or in a feedback type pulse width amplitude time division multiplier network. A constant amplitude triangular generator is associated with the multiplier and the multiplier is implemented using C-MOS technology. The output modulated pulse signals from the multiplier are summed and converted in, for example, a low pass filter to a signal having an amplitude representative of the power in the power consuming system. An analog-to-pulse rate converter is used for converting the signal representing the average power to a series of output signals having a variable pulse repetition rate which is proportional to the average power, each output pulse signal representing a quantized amount of electrical energy. A stepping switch and register perform conventional accumulation, storage and display functions in response to the series of output pulse signals delivered thereto.
REFERENCES:
patent: 1915581 (1933-06-01), Schneider
patent: 3794917 (1974-02-01), Martin et al.
General Electric Company
Myles Vale P.
Punter Wm. H.
Smith Alfred E.
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