Quasiresonant soft switching PWM voltage-fed high frequency inverter usingSIT for induction heating applications

This paper presents a novel quasiresonant high frequency inverter at a fixe d frequency of 200 kHz using static induction transistors (SITs) as power s emiconductor switches. It is designed to operate under zero-volt switching to minimise switching losses, electrical stresses and EMI noises over a wid e range of regulated output power. Its output power can be regulated effect ively by adjusting the duty cycle of the switching signals fed to the activ e switches. Its circuit operation and performance are analysed by computer- aided simulation, The simulation results are in good agreement with experim ental ones obtained from a feasible breadboard. As a result, it is finding wide industrial applications, especially for induction heating.