Conversor matricial com comutação suave

Abstract

This paper discusses the application of a switching cell to a soft switching converter matrix. At the beginning of the work are presented the characteristics of the converter, pointing out their advantages and disadvantages. In the sequence, is performed the study on the soft switching technique, known as ZVT, which is characterized by not present the elements in series with the circuit matrix. This technique allows the converter switching matrix occur at zero voltage (ZVS). In order to make this possible is used an auxiliary switching circuit (cac). This circuit has the purpose to divert part of the ow of power, enabling switching between the phases of the matrix converter and, following return this energy to the load. Also, this same circuit performs its switching also with null conditions, i.e. at zero current (ZCS). All steps required during the commutations are analyzed; through phase circuits plans and expressions that determine the duration of each stage. Some changes in the performance of the auxiliary circuit are proposed in order to reduce the energy required in the process of switching. Finally, to validate the study was implemented a platform for studies. On this platform, we chose to implement a converter matrix with three-phase input and single phase output and a switching auxiliary circuit. The results show that the auxiliary circuit allowed to occur semiconductor switches of the switching matrix circuit at zero voltage. The proposed modifications have enabled the commutations occur in safe form, besides ensuring null condition in the semiconductor by reducing the amount of energy involved in the switching process.