Meaning
Numerical algorithm that resolves the interdependence between heat generation and electrical current flow within a simulated structure. Usage of a coupled thermal electrical solver is necessary when the resistivity of a material changes enough with temperature to alter the current distribution. Iteration occurs between the two physical domains until it reaches a stable solution.
Simultaneous Integration
Calculations for the electrical field and the temperature field occur within the same time step or iteration loop. Traditional methods that calculate heat separately from current often underestimate the peak temperatures in power electronics. The integrated approach captures the runaway effect where heat increases resistance (which then increases local heat generation).
Thermal Management
Analysis of power modules for the electric vehicle industry in China relies on these simulations to meet national safety standards. Certification by the China Automotive Technology and Research Center often requires evidence that thermal hotspots have been identified using an approved multi-physics method. Accurate modeling reduces the need for physical prototypes during the initial design phase of a high-voltage inverter.
Computational Boundary
Reliability of the output depends on the accuracy of the temperature-dependent material properties provided in the input database. Results are only as valid as the boundary conditions assigned to the edges of the model.
