Galerkin's Projection Framework for BCI CTMs - Part I: Extended FANTASTIC Approach

A general Galerkin's projection framework is proposed for the definition of boundary condition independent (BCI) compact thermal models (CTMs). First, it is shown how the proposals of BCI CTMs, deriving from the works of Bar-Cohen and Sabry, can be straightforwardly reinterpreted within this framework. Then, following such reinterpretation, the approach due to Lasance, nowadays widely adopted for the extraction of BCI CTMs, is generalized into a novel approach, based on the extension of the previous FAst Novel Thermal Analysis Simulation Tool for Integrated Circuits (FANTASTIC) method, from the fixed boundary conditions case to the BCI case. Such an approach allows widely enlarging the set of boundary conditions for which a BCI CTM ensures accuracy and allows overcoming the main limitations of previous approaches, e.g., with multisource problems and dynamic models

Requirements specification for multi-domain LED compact model development in Delphi4LED

Light-emitting diode (LED) technology has been rapidly developing due to high energy efficiency and longer lifetimes of LED luminaires. One of the main challenges in designing LED components is to manage the inter-twined relation between thermal, electrical, and optical performances. These dependencies are required to be well understood in order to operate LEDs efficiently and have accurate performance prediction at different levels of the product value chain. Delphi4LED project aims at developing standardised method to create multi-domain (thermal, electrical, and optical) compact models from the measurement data. To obtain highly reliable and representative data sets via characterisation and calibration, end-user requirements specification for diverse LED samples are needed. In this paper, we report the lists of LED parameters and components selected for measurements, simulation and calibration considering end-user needs. We also show some of the methodologies for compact thermal model development that are recommended in Delphi4LED, followed by definition of simulation benchmark problems