Cryogenic Power Converter Module Performance

Abstract

Several cryogenic power converter modules were built and tested, including a low‐voltage, high‐power series based on Cryo‐MOSFETs and a high‐voltage, high‐power series based on Cryo‐IGBTs. Half‐bridge modules were manufactured and demonstrated in liquid nitrogen. The hardware is such that several half‐bridge modules can be interconnected to form a multiphase full bridge. Conduction losses in the MOSFET modules were reduced by more than an order of magnitude. Switching powers up to 340 kW were achieved in the MOSFET modules, and 720 kW was demonstrated in the IGBT series. These modules can be utilized in fully integrated, megawatt‐level cryogenic power systems.