Conversor CC-CC SEPIC com célula R²P² para aplicações com elevado ganho estático

Abstract

The present work aims to study a DC-DC SEPIC converter operating in continuous conduction mode for applications with high voltage gain, in non-isolated and isolated versions. Among the techniques used to obtain high gain, such as switched inductor and switched capacitor, this converter uses R²P² cell, originated by the concept of reduced redundant power processing. The DC-DC SEPIC R²P² converter maintains the main characteristics of the conventional SEPIC converter, featuring only one controlled switch, which reduces the complexity and cost. As a disadvantage, there is an increase in the component count. In the isolated version, the work presents the study of two clamping circuits, one the RCD dissipative and the other nondissipative, to mitigate the problem of overvoltage in the transistor, resulting from the energy stored in the transformer’s leakage inductance. The work also presents the theoretical analysis of the converters, with the description of the principle of operation, the design equations and a design procedure. Finally, the work presents numerical simulation results from a converter operating with 40 V of input voltage, 400 V of voltage output, 50 kHz of switching frequency and 200 W of rated power.