This paper describes a new single-phase controller for supplying resistive loads, with two different strategies. Load voltage is varied by controlling the flux linkage of a single transformer windings used with the proposed system. The primary of the transformer is connected in series with the load of the a.c. supply, while the secondary is shunted with a control device. The flux linkage is controlled by using either a pair of thyristor "triac" (phase controlled) or a MOSFET transistor (a.c. chopper topology). Simulation analysis of the two proposed methods of control are presented, and verified by experimental results in different cases of operation. The advantages of the proposed system are simple, effective, accurate, low distortion of supply current, smooth regulation of load voltage and low cost. The proposed system can be used in industry applications such as heaters, lighting control and a.c. drive controls.
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