A Novel Dual-LLC Resonant Soft Switching Converter for Super High Frequency Induction Heating Power Supplies

A novel dual-LLC resonant tanks zero voltage softswitching converter for super high-frequency solid-state induction heating power supplies is proposed in this paper. The proposed converter is capable of absorbing the inductive and capacitive parasitical components in the circuit. Switch devices operate in zero-voltage soft switching mode. The problems of high voltage and current spikes caused by oscillation of parasitic inductors or capacitors, and huge switching loss in super high-frequency operation, which are troublesome in super high-frequency circuits, can be solved. Moreover, a large inductor is inset in the input, this novel converter shares the benefits of both voltage-type and current-type inverters simultaneously, and the dead-time between two switches does not need, therefore, this converter is suit to operate in super high frequency conditions. The working principle of the converter is introduced, simulation and experimental results operating around 1 MHz frequency are given.