Three-Phase Integrated PFC AC-AC Resonant Inverter with Weak Coupled Coils for Induction Heating Application

This paper proposes a 4.3 kW three-phase integrated PFC AC-AC resonant inverter for Induction Heating (IH) Application. This converter is composed by three independent resonant inverters with non-smoothed DC link that achieves high power factor operation. The magnetic coupling of the three coils was modeled by using the impedance matrix for characterizing the resonant behavior of the arrangement. The coils arrangement with weak coupling between coils is applied for induction water heater. Experimental results validate the modes of operation with ZVS and the converter performance in the entire power input range (PF and THD).