Evaluation, design, and test of single switch high step‐up boost converter with autotransformer

Abstract

In this article, different autotransformer structures are discussed, demonstrating their connection and voltage gain characteristics. In this sense, an autotransformer structure was chosen that presents a high voltage gain with a low transformation ratio (N), thus seeking to reduce the leakage inductance and volume. From there, this structure is integrated into the isolated boost converter, thus generating a new high step-up DC-DC topology. The proposed converter presents as main characteristics: high voltage gain, low voltage stress on the components, continuous input current, low number of components, simplicity of operation and control, and high efficiency. To validate the theoretical evaluations, a 200 W, 30 V/400 V prototype was built in the laboratory, achieving a maximum efficiency of 96.25%.