Electronic Ballast for Gas Discharge Lamp Based on Input-Series Output-Series Resonant Converter

The paper discusses design of input-series and output series (ISOS) resonant inverter for discharge lamp power supply. Zero-voltage switching (ZVS) is achieved for each main switch without any auxiliary circuit. Voltage stress of each main switch is half of input voltage. The input voltage balancing problem also is addressed in the paper. First of all the operation of the converter is analyzed on the simulation model and after that the presented converter are verified on experimental prototype with 3 phase AC input voltage and 3 kW output power.