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POWER METER HAVING COMPLEX QUADRATURE OUTPUT CURRENT AND VOLTAGE FILTERS

  • US 20090243591A1
  • Filed: 03/28/2008
  • Published: 10/01/2009
  • Est. Priority Date: 03/28/2008
  • Status: Active Grant
First Claim
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1. A power measurement system comprising:

  • a current measurement circuit for measuring a current through a load;

    a first bandpass filter having a bandpass filter response formed by complex non-conjugate poles, wherein the first bandpass filter has an input coupled to an output of the current measurement circuit and provides complex current output components indicative of real and imaginary portions of the current, and wherein the first bandpass filter response rejects one of a positive or a negative half of a complex frequency spectrum;

    a voltage measurement circuit for measuring a voltage across terminals of the load;

    a second bandpass filter having a response substantially identical to the bandpass filter response, wherein the second bandpass filter has an input coupled to an output of the voltage measurement circuit and provides complex voltage output components indicative of real and imaginary portions of the voltage; and

    a processing system for receiving the complex current output components and the complex voltage output components and providing at least one indication of a power provided to the load.

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