Multiple-Output Resonant Matrix Converter for Multiple Induction Heaters

Most of the ac-ac converters used in home appliances are based on single-output dc-link inverters, which provide a cost-effective and straightforward solution. However, a two-stage power conversion decreases power density and efficiency. A direct ac-ac conversion has been thoroughly studied in the past. Nevertheless, the complex control scheme and higher cost have prevented it from being used in cost-oriented applications, such as home appliances. This paper proposes a direct ac-ac conversion scheme by means of a multiple-output resonant matrix converter applied to multiple inductive load systems. The proposed topology reduces significantly the number of devices and complexity, leading to an efficient, versatile, and cost-effective solution. The analytical and simulation results have been verified by means of a prototype applied to a novel total-active-surface induction-heating appliance.