Abstract: As the core component of the high speed frequency conversion system, the converter has a large power density and heat dissipation difficulties when working, and the heat generation of the internal power devices of the converter is large, and the excessive temperature rise will lead to the failure of the power devices, which greatly affects the stability of the operation of the frequency conversion system. ARIZ is a tool in TRIZ theory that comprehensively uses multiple tools to solve problems, and is a method specifically used to solve complex problems. Aiming at the problem that the temperature of the internal power device of the converter, the minimum problem is defined by using the ARIZ algorithm: it is necessary to make minimal changes to the system to reduce the temperature of the power devices without increasing the energy consumption of the heat sink. Aiming at the smallest problem, the ideal final result and physical contradiction were defined, and the expanded substance field resources and knowledge base were used to solve the problem, and a comprehensive innovative solution is obtained. Finally, the feasibility of the scheme is verified by simulation analysis and experimental results, and the temperature of the power devices is reduced by more than 10%, and the goal is achieved.

Key words: ARIZ, The smallest problem, The ideal final result, Innovative solutions