Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1978-07-11
1980-01-08
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
G01R 2106
Patent
active
041829832
ABSTRACT:
An electronic AC electric energy measuring circuit converts a di/dt analog input signal into a pulse width modulated signal responsive to the amplitude of a current component of an alternating current energy quantity to be measured. The pulse width modulated signal is produced by a first modulator circuit including an integrator circuit deriving both a modulating frequency signal and a current analog signal proportional to the current component. A multiplying circuit receives a voltage analog input signal and applies it to a reference input of a second modulator circuit. The modulating control of the second modulator circuit receives the pulse width modulated signal so that the multiplying circuit produces a variable amplitude and pulse width modulated signal having an average value equal to an average power measurement. An analog to frequency converter including a second integrator circuit receives the output of the multiplying circuit to produce an output pulse representative of a quantized amount of electric energy.
REFERENCES:
patent: Re29079 (1976-12-01), Gilbert
patent: 3764908 (1973-10-01), Elms
patent: 3864631 (1975-02-01), Zitelli et al.
patent: 4066960 (1978-01-01), Milkovic
Heinrich Theodore M.
Zelezniak Joseph J.
Krawczewicz Stanley T.
Smith R. W.
Westinghouse Electric Corp.
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