PHASE DIFFERENCE DETECTION CIRCUIT, PLL CIRCUIT, PHASE DIFFERENCE DETECTING METHOD AND PHASE DIFFERENCE DETECTION PROGRAM

摘要

PROBLEM TO BE SOLVED: To accomplish a phase difference detection function without using hardware for zero cross point detection.

SOLUTION: A phase difference detection circuit is a circuit for detecting a phase difference between a detecting signal and an internal reference signal and comprises a d-q axis transform unit 5, a one-cycle full addition unit 6 and a phase difference calculation unit 7. The d-q axis transform unit 5 uses the internal reference signal to perform d-q transform on the detecting signal, thereby calculating an instantaneous value active component (d) and an instantaneous value reactive component (d). The one-cycle full addition unit 6 fully adds the instantaneous value active component (d) for one cycle to calculate an active component D and further fully adds the instantaneous value reactive component (q) for one cycle to calculate a reactive component Q. The phase difference calculation unit 7 uses the active component D and the reactive component Q to calculate the phase difference.

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