Method and apparatus for compensating phase distortion caused by

Details Method and apparatus for compensating phase distortion caused by Method and apparatus for compensating phase distortion caused by

1997-06-05

1999-10-05

Riley, Shawn

Electricity: power supply or regulation systems

For phase shift or control

219110, 2191301, 323246, G05F 700

Patent

active

059630221

ABSTRACT:
A phase control system has a stable timebase phase reference generated by an internal phase reference generator. The control includes a method for estimating and compensating phase distortion when an inductive load is driven by an AC voltage source having significant line impedance. A digital phase comparator estimates a phase error between the timebase phase reference and the voltage source. At the initialization of the phase control system, the phase reference clock period is frozen for a fixed number of cycles to determine an average phase error due to the phase distortion caused by the line impedance. The estimated phase error is then corrected to account for the average phase distortion error.

REFERENCES:
patent: 4493040 (1985-01-01), Vanderhelst
patent: 4634830 (1987-01-01), Furudate
patent: 4821202 (1989-04-01), Davis et al.
patent: 4945201 (1990-07-01), Ito et al.
patent: 5450315 (1995-09-01), Stefanski

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