METHOD AND APPARATUS FOR CONTROLLING THE AVERAGE OF HALF-TIMES OR THE QUADRATIC AVERAGE OF THE VOLTAGE OF A LOAD.

摘要

The apparatus comprises switching means (14) connected in series between the alternating current source (12) and the load (11) of the timing means (20) which control the switching means so that they allow the flow current through the load for at least one time interval during each half cycle and means (32, 34) which sample the voltage magnitude across the load and apply an adjustment signal (ADJ) to the means timing in order to adjust the conduction time interval of the switching means so that the average quantity of half-vibrations or the quadratic average quantity of the voltage applied to the load is approximately equal to a desired value.