A Single Stage Electronic Ballast with Duty Ratio Controlled Current Fed Resonant Inverter

The conventional line-frequency magnetic ballast is heavy and bulky thereby making the device to be too large for installation within the compact fluorescent lamp (CFL). In this paper single stage electronic ballast with duty ratio controlled current fed resonant inverter is proposed. A fluorescent lamp power circuit is designed by combining a buck boost power factor corrector with a current-fed resonant inverter. This combination allows a single power-processing unit that has less the number of circuit components. The proposed circuit has reduced circulating current in the resonant tank and also uses a simple gate driver such that isolation devices are not required. Simulation waveforms are provided to highlight the merits of the proposed circuit for a 40W lamp. The design, analysis and simulation is done using MATLAB SIMULINK version 8.