Conversor ressonante aplicado ao aquecimento indutivo com estrutura dupla bobina acoplada.

Abstract

This work presents the development of a resonant converter for use in inductive heating, and uses a magnetic structure of coupled coils. Initially, some basic considerations regarding inductive heating and some converters available in the literature are presented. Then, the phenomenon of inductive heating is presented in a more theoretical way. As the converters used are the resonant ones, a presentation of the characteristic behavior of some converters is made, where these characteristics depend mainly on the switching frequency of the semiconductors and the type of resonant tank that make up the converter. due to network power supply for the proposed converter, a presentation of techniques used to minimize the effect of currents from high frequency switching is made, where passive filters and power factor pre-regulators are presented. In the final part, the proposed magnetic structure is presented, as well as the converter proposed for use in this structure, and the characterization of the converter is carried out, presenting its operating stages and the relevant behavior of the quantities in the components. Finally, experimental results are compared to those of simution with the purpose of observing the model used and the behavior of the input power by the variation of the three types of variation of the same, namely: the variation of the power by the switching frequency; the variation by the work rate; and the variation by the lag between the switching instants of the switched structures of the converter.