Analysis of the effects of strong stray magnetic fields generated by tokamak device on transformers assembled inelectronic power converters

Abstract As the plasma current power in tokamak devices increases, a significant number of stray magnetic fields are generated around the equipment. These stray magnetic fields can disrupt the operation of electronic power devices, particularly transformers in switched-mode power supplies. Testing flyback converters with transformers under strong background magnetic fields highlights electromagnetic compatibility (EMC) issues for such switched-mode power supplies. This study utilizes finite element analysis software to simulate the electromagnetic environment of switched-mode power supply transformers and investigates the impact of variations in different magnetic field parameters on the performance of switched-mode power supplies under strong stray magnetic fields. The findings indicate that EMC issues are associated with transformer core saturation and can be alleviated through appropriate configurations of the core size, air gap, fillet radius, and installation direction. This study offers novel solutions for addressing EMC issues in high magnetic field environments.