Electronic circuit for measuring electrical energy
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United States of America Patent
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-
May 5, 1987
Grant Date -
N/A
app pub date -
Oct 2, 1985
filing date -
Oct 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shift register is utilized to provide a 90.degree. delay in a pulse width modulated current signal to determine volt-amperes reactive. The shift register is associated 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.degree., 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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