A novel analysis of full bridge series-parallel resonant inverter for high frequency application

This paper proposes a high efficiency full bridge series-parallel resonant inverter for high frequency applications (Induction Heating) by using asymmetrical voltage cancellation control. The operating frequency is automatically adjusted to maintain a small constant lagging phase angle under load parameter variation. The output power is controlled using the asymmetrical voltage cancellation technique. The full bridge series-parallel resonant tank is designed without the use of output transformer. This results in an increase of the net efficiency of the induction heating system. This system has an advantage like reduced volume and switching losses. The circuit model is developed for the closed loop system and they are used for simulation studies. The simulation results of closed loop systems are presented. Experimental results are compared with simulation results.