Patent ID: 7609051

Claim:
An energy consumption meter comprising: a first input for providing a first input signal derived from a voltage; a first analog-to-digital converter electrically connected to the first input to generate a first output signal based on the first input signal; a second input for providing a second input signal derived from a current; a second analog-to-digital converter electrically connected to the second input to generate a second output signal based on the second input signal; a multiplier to combine signals corresponding to the first and second output signals; a phase evaluation block comprising two inputs, one of the two inputs being electrically connected to the first input and another of the two inputs being electrically connected to the second input, the phase evaluation block to measure a phase difference that corresponds to a phase difference between the first input signal and the second input signal, and the phase evaluation block comprising an output that is electrically connected to a phase correction block; and the phase correction block electrically connected to an output terminal of one of the first and second analog-to digital converters, the phase correction block to correct for the phase difference in one of the first output signal and the second output signal.