Series resonant inverter with selective harmonic operation applied to all-metal domestic induction heating

Usually domestic induction appliances heat ferromagnetic pans. This technology is well known and it is successfully applied by many manufacturers. However, there are a number of non-ferromagnetic pans (made of aluminium, copper, copper-nickel or stainless steel) that cannot be properly heated by this technology. This study presents a modified half-bridge series resonant inverter topology that can be used to heat ferromagnetic and non-ferromagnetic pans by means of a selective harmonic operation technique. The proposed inverter topology has two topological configurations with two operation modes: the first-harmonic operation mode and the third-harmonic operation mode. These two operation modes and the design of the principal parts of the inverter are presented in this study. Experimental results obtained with a prototype are also presented. The performance of the proposed resonant inverter topology with ferromagnetic pans is satisfactory and with non-ferromagnetic pans is acceptable.