Exploration des stratégies de refroidissement par jets confinés pour les convertisseurs à composants WBG

The electric transmission system is a key element of future mobility. It is desirable to reduce the footprint, increase the efficiency and power density of the entire electric traction system. The recent emergence of new Wide-Band Gap (WBG) semiconductor technologies offer great potential for efficient, compact, and economical power transmissions. The maximum performance use of WBG components, however, requires a sufficiently efficient cooling system. In the literature, new architectures of cooling systems have recently appeared to respond to this problem. Nevertheless, the development of these solutions requires a research effort to understand the thermal phenomena involved in this cooling process. In this thesis, cooling solutions by jet impingement liquid cooling will be studied. With the constant increase in power density of converters based WBG components, electrothermal modeling becomes a necessity for an accurate prediction of electrical and thermal performance of components (junction temperature) to improve their reliability. 
To achieve this, we propose in this thesis the development of a representative experimental model of a power electronic board based on WBG components cooled by jet impingement. An optical thermal measurement methodology will be deployed, to establish an experimental database sufficiently representative of WBG components in a real environment. This database will be compared to the relevant thermal models of the bibliographic references. Models based on thermal impedance networks can then be proposed and tested to develop a calculation tool making it possible to finely estimate the WBG chips junction temperature.