Link IEEE

A key challenge in cryogenic applications is managing heat input from the warmer environment. This paper presents a novel Medium-Frequency Transformer (MFT) concept designed for converter integration as a thermal insulator at cryogenic temperatures. First, the basic idea of the thermally insulating transformer is outlined, followed by electromagnetic dimensioning and thermal design considerations. Detailed simulations illustrate the effects of critical design parameters on thermal and electromagnetic performance. Based on these insights, a prototype MFT is developed and integrated into a 20 kW/100kHz Dual Active Bridge (DAB) converter topology. Measurement results validate the functionality of the developed MFT in conjunction with the DAB, demonstrating its potential for efficient thermal management in cryogenic environments.

Link IEEE-Explorer

This paper introduces a fully automated test bench for −75 °C up to 160 °C static and dynamic semiconductor characterization. First measurements performed with a 1.2 kV, 200 A Si-IGBT module and a 1.2 kV, 250 A SiC-MOSFET module show better semiconductor performance at lower temperatures compared to the conventional high temperature operation.

Link MDPI

This study highlights the interdependencies between the design of a fully superconducting 10 MW wind power generator and the corresponding design of its power electronic converter.