Phase shifted ZVS-PWM high frequency load resonant inverter for induction heated foam metal type dual packs fluid heater

This paper presents a novel prototype of phase shift ZVS-PWM controlled high frequency load resonant inverter with lossless capacitor snubbers in addition to active resonant snubber for electromagnetic induction fluid heating appliances. The operating principle and unique features of this soft switching high frequency inverter circuit are described herein. The constant frequency phase shift ZVS-PWM controlled voltage source type high frequency load resonant inverter employing IGBTs is proposed for series capacitor compensated load, which is capable of achieving stable and efficient zero voltage soft commutation over a widely specified power regulation range from full power to low power. The steady state operating performance of this high frequency inverter is evaluated and discussed on the basis of simulation and experimental results for newly developed induction heated dual-pack heater of compact moving fluid heating appliance in the pipeline.