G - Physics – 01 – R
Patent
G - Physics
01
R
324/70
G01R 21/133 (2006.01) G01R 15/18 (2006.01)
Patent
CA 2004333
ABSTRACT An improved DC stabilization system is provided in an electronic digital power meter of the type utilizing current transformers to scale and isolate the power line current and an analog to digital converter to convert the meter currents to a digital signal for signal processing. An unmodulated square wave signal is provided to trigger a chopper switch which connects the current transformer to an amplifier and provides a current signal output. A feedback current from the amplifier is provided through the feedback and sense windings of the current transformer by the chopper to compensate for the effects of DC offset voltage at the input of the amplifier. The square wave is a low frequency such that its harmonics and those of the power lines are different to minimize the gain bandwidth requirements of amplifiers in the system. The timing signals for the analog to digital converter are controlled to avoid sampling at the transition of the square wave signal to enhance conversion accuracy and means are provided-to remove the signal inversion in the current signal introduced by the chopper.
Germer Warren R.
Ouellette Maurice J.
Company General Electric
Eckersley Raymond A.
Germer Warren R.
Ouellette Maurice J.
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