A Comparison of the Designs of Shell-Type and Core-Type Solid State Transformers With Convex Optimization

Abstract This paper presents a computer-aided minimum mass design of both shell and core type medium frequency single phase solid state transformers using split winding and Litz wires. The aim of the study is to compare the performance of these two designs in terms of their mass and efficiency. The design process involves modeling the transformers using geometric programming, which allows for a global optimum solution to be found for a given set of constraints. The models are optimized for minimum mass while maintaining a fixed power rating and voltage level. The study finds that the core type transformer has a lower mass than the shell type transformer. However, the shell type transformer has a higher efficiency than the core type transformer. The use of split winding and Litz wires in both designs significantly improves the efficiency and reduces the mass of the transformers. The paper concludes that the choice between a shell type and core type transformer ultimately depends on the specific requirements of the application, as each design has its own advantages and disadvantages. However, the use of split winding and Litz wires is recommended in both designs to improve efficiency and reduce mass. Overall, this study provides valuable insights into the design of medium frequency single phase solid state transformers, and the use of computer-aided design methods to optimize their performance.