A novel PWM inverter control circuitry for induction heating

In induction heating applications, the heating coils may have different types for different loads. A suitable control method is often needed to let the power electronic circuit working in most fittable condition to supply power to the load. In this paper, a simple novel control strategy for induction heating is described. The most outstanding advantage of this method is a design of a simple PWM (pulse-width-modulation) gate signal driving circuitry for easily dead time setting, ZVS (zero voltage switching) operation, and less components architecture. Another advantage of this technique is using a very simple method to alternate the two complementary PWM output signals into different switching devices in heating period for balancing the operation duty cycles.