Single Switch Electronic Ballast with Unity Power Factor for Compact Fluorescent Lightings Based on a Single-Stage Current Fed Resonant Inverter

A novel single stage single switch electronic ballast topology with unity power factor is presented in this paper. The proposed circuit consists of an integrated buck-boost stage that is operating in the discontinuous conduction mode to provide high power factor and a single switch current fed resonant inverter to stabilize the lamp current. The proposed topology presents a low cost and compact electronic ballast design method. Detailed operating principles of the proposed circuit are provided in this paper. Experimental results confirm that a very high power factor of 0.995 and an efficiency of 92.4% are achieved on a 26 W compact fluorescent lamp for the proposed work.