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The power section of a new ac regulator is presented and analyzed. The regulator switches between ac levels with SCRs to obtain regulation. The regulator is well suited for uses such as line regulation at high power levels. The SCRs may be placed in either the primary or secondary of the power transformer. The regulator inherently has high efficiency and relatively low distortion. Equations needed for the power section design are plotted in a normalized manner. A design example is presented to illustrate use of the information presented. Basic circuit concepts are included.