The Generation of DC-DC Converters using new Three-Terminal Multiple-State Cells

This paper presents the generation of basic DC-DC non-isolated converters from a new three-terminal commutation cell with four commutation states. The commutation cell proposed is composed of a high frequency three-phase transformer connected in Y-Delta, associated with three switches, three diodes and an inductor. The principle of operation of the proposed cell is described. The buck, boost and buck-boost converters generated from using the cell are shown and their static gains in both DCM and CCM are presented along with their output characteristics. A theoretical analysis is depicted and experimental results from a buck converter are also presented. A generalization regarding the number of phases is also shown. The advantages of using this cell are: distribution of the currents among the phases without the need of a control to balance the currents; a reduction in the conduction losses; an increase in the frequency of the input and output filters, reducing the ripple. Due to the characteristics presented, this cell is indicated for applications in converters with low voltage and high current