Study of Energy Efficient Electronic Ballast

The demand of efficient lighting is increasing day by day. The efficient lighting includes maximum efficacy of light as well as maximum utilization of energy by improving the power factor with less complexity. The discharge lamps with high frequency electronic ballasts are used for maximum efficient lighting. The power factor of the ballast which is used in fluorescent lamp circuit should be increased in order to reduce the losses. Normally a self oscillating technique with two number of switches is used in electronic ballasts in fluorescent lamps. Along with the high frequency inverter, a converter based power factor corrector is used. Both the high frequency inverter part and the converter power factor corrector part are tried to integrate together in order to reduce the total number of switches and thereby reducing the control circuitry. The proposed topology is composed of a single-ended primary-inductance converter(SEPIC), used as a power-factor correction stage, integrated with a resonant half-bridge inverter. A single-stage HPF electronic ballast with two number of switches is designed for a 100 W fluorescent lamp operating at a frequency of 250 KHz and is simulated in Mat-lab SIMULINK software. This ballast is compared with self oscillating type of electronic ballast which is having no power factor correction stage.