THE RESEARCH OF MAXIMUM VOLTAGES IN THE BACK-BOOST DC-DC CONVERTERS WITH BOUNDARY MODE OPERATION

Abstract

In the article the formulas for calculation maximum voltage of the power switches of the inverting back-boost DC-DC converters with boundary mode operation were obtained. Based on these formulas, the researches maximum voltage of the power switches from turns ratio of the power inductor were made. It is shown that by choosing the turn ratio of the power inductor it is possible to redistribute the maximum voltage values on the power switching elements and thereby increase the efficiency of the converter due to the decrease in the value of dynamic losses during conversion in the boundary mode. The features of the influence of the ratio of the converter input and output voltages on the value of the optimum power inductor turn ratio are revealed.