An electronic ballast circuit operated at unity power factor based in a parallel resonant topology (Fig. 1) equipped with a field controlled thyristor is presented. The operation of the circuit is analyzed and its design rules are specified. The proposed topology is simulated in Spice and a laboratory prototype is realized. Good agreement between the predicted behaviour and measurements was observed. The proposed topology can be employed, in a broad range of application: power supplies, battery chargers and home appliances.
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