Tektronix, Inc.

Cory A Westerlund

John Charles Dalrymple

Bruce K Baur

A duty cycle based AC power control method reduces objectionable voltage fluctuations at a frequency that causes 'flicker' by shifting the frequency of actuations of controlled devices to frequencies significantly greater than and/or less than the flicker sensitive frequency. The frequency of actuations may be redistributed (1) by segmenting the devices to provide approximately equal power requirements per actuation, (2) by providing one-half cycle actuation pulses rather than one cycle actuation pulses, and/or (3) by spacing the actuations evenly over a given time period and forcing the aggregate demand to follow a slowly rising/falling envelope. The result is the minimization of power distribution at the flicker frequency.

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Wilsonville, OR, United States of America

Cory A Westerlund