A high precision power supply meter

This paper describes an efficient implementation of a power supply meter. The implementation is based on the Fourier Series decomposition algorithm, using CORDIC algorithm for complex mathematical computations. It is able to calculate RMS and peak values, phase shift, power factor, and complex, active, and reactive power for two periodic waveforms up to the 25th harmonic. Several implementation alternatives are compared pointing out the advantages and the disadvantages of each one. Then the circuit structure at block level is described with emphasis on the advantages resulted from the use of CORDIC algorithm, followed by some considerations over precision issues.