Abstract: Investigating the temperature distribution patterns and electrothermal conduction mechanisms of magnetic components during operation holds significant theoretical and practical value for optimizing device design and enhancing system reliability. Focus on the temperature rise of magnetic components in household variable-frequency air conditioning electric control systems. Based on the electrical characteristics of magnetic elements and their loss mechanisms, establish a multi-physics coupled simulation model integrating electrical, magnetic, loss, and thermal fields to systematically analyze the electrothermal coupling process from electrical parameters to temperature distribution. Furthermore, numerical simulations and analysis are conducted to examine the temperature rise characteristics and distribution patterns of PFC inductors. The results demonstrate that coupling the electrothermal process through component loss calculations can effectively predict the thermal behavior of magnetic devices, providing a reliable theoretical foundation and technical support for design optimization and addressing excessive temperature rise issues. This approach establishes a technical basis for board-level electrothermal co-design in thermal management, thereby reducing development costs.

Key words: Inverter air conditioner, Magnetic components, Electrothermal coupling, Multiphysics simulation