Electronic ballast in half-bridge configuration with power factor correction

This paper presents a study and the design with the technical aspects of implementing electronic ballast used for lighting and keeping the power of a lamp while restricting and controlling the input current during its activity. The electronic ballast circuit proposed is based on two power converters, like a boost converter with power factor correction (PFC) and an a half bridge converter with resonant circuit in order to turn on one or more lamps. Taking into account the practical and technological constraints, the necessary frequency converter must be based on a DC voltage source, a capacitive divider and a series-resonant single-phase power inverter (half-bridge converter). The need for a boost converter is explained by the fact that the half bridge converter feeds with DC voltage and the presence of a simple rectifier would not solve the problems caused by distortions on the supply network. The result obtained validates the operation of the circuit and the paper presents the waveforms for output voltage and current and the total harmonic distortion and power factor correction on input AC voltage.