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High Frequency Electronic Ballast with High Efficiency and High Power Factor

This paper presents a high frequency electronic ballast with high efficiency and high power factor. The proposed ballast have driven by the half bridge inverter which is linked diode rectifier without DC link capacitor. Minimized elements of circuit configurations can make the efficiency of the ballast increase. High input power factor which is up to 0.96 can be achieved and the crest factor of lamp current waveforms is controlled with below 1.75 by using a novel control scheme which has PFM and PWM methods simultaneously. In this paper, the circuit configurations of the proposed ballast and the control schemes are described. The usefulness of the proposed ballast is confirmed with the simulation results.