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US 2009/0243591 A1Published application
Power meter having complex quadrature output current and voltage filters
AssigneeCirrus Logic, Inc.
InventorJohn L. Melanson
Life of this patent
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AssigneeCirrus Logic, Inc.
InventorJohn L. Melanson
Estimating the term…
A power meter having complex quadrature output current and voltage filters provides power measurements in high amplitude and frequency variation and/or high jitter environments without requiring high computational overhead. A pair of filters, one for voltage and one for current each have a response determined by complex non-conjugate poles. The response of the filters is such that only the positive or negative half plane of the complex frequency spectrum is passed and provide complex outputs representing the real and imaginary parts of both the current and voltage. At least one indication of a power delivered to a load is computed from the complex current and voltage outputs, which may be the real and/or reactive power.
A power measurement system comprising:
A method of measuring electrical power supplied to a load, comprising:
The method of claim 17, wherein the detecting is performed by multiplying the imaginary portion of the result of the given one of the first or second filtering with the input provided to the given one of the first or second filtering, and wherein the adjusting adjusts the coefficients of the bandpass filter response by rotating a set of fixed pole values by multiplying each of the set of fixed pole values by a complex adjustment value determined in conformity with the detected deviation from the quadrature relationship.
A power measurement system comprising:
A computer program product comprising computer readable storage media containing program instructions for execution by a digital signal processing core, the program instructions including program instructions for:
Dependencies are inferred from the claim text.