Patent ID: 7446582

Claim:
A phase angle control method comprising: a. generating a first periodic function having a first amplitude; b. generating a second periodic function having a second amplitude and which is phase-shifted relative to the first periodic function by a first phase angle; c. generating a first positive feedback periodic function; d. generating a second positive feedback periodic function which is phase-shifted relative to the first positive feedback periodic function by a second phase angle; e. generating a first control function; f. generating a first weighting function; g. generating a second weighting function; h. linearly combining the product of the first positive feedback periodic function and the first weighting function with the product of the second positive feedback periodic function and the second weighting function to generate a second control function; and i. applying the first control function and the second control function to the first and second periodic functions to maintain the first and second amplitudes and to maintain the first phase angle.