Electronic circuit for measuring electrical energy

Details Electronic circuit for measuring electrical energy Electronic circuit for measuring electrical energy

G - Physics

01

R

324/70

G01R 21/127 (2006.01)

Patent

CA 1246147

21 50,874 ABSTRACT OF THE INVENTION A shift register is utilized to provide a 90° delay in a pulse width modulated current signal, to deter- mine volt-amperes reactive. The shift register is asso- ciated with a clock that provides a preselected frequency that, in combination with the number of stages in the shift register, delays the pulse width modulated current signal by an amount equivalent to one-quarter period of the current waveform in the metered circuit. After delaying the pulse width modulated signal by 90°, the shifted signal is multiplied by a voltage signal that represents the voltage in the metered circuit and the resulting product signal is input to a voltage-to-frequency converter.

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