Effect of inter-layer interface quality on electrical and thermal characteristics of IMS

The manufacturing processes involved in producing insulated metal substrate (IMS) products are shown to lead to inconsistent thickness of the insulator layer. The electrical and thermal effect of this uneven structure is investigated when compared to a classic parallel plate approximation. Methods of modelling the inter-layer thermal conductivity and electrical capacitance of IMS products are described and an improvement in accuracy of up to 15% is established over conventional model approximations based on manufacturer's data.