A thermal modeling method considering ambient temperature dynamics

This letter proposes a thermal modeling method for power electronic components. It represents the thermal dynamics introduced by the ambient temperature variation, which cannot be achieved by existing analytical methods. By using the superposition theorem and time-domain analysis, the limitations of the existing analytical method based on stable ambient temperature are investigated. Then, the proposed thermal modeling method, which considers the thermal dynamics from both power loss and ambient temperature disturbances, is presented. In order to obtain the thermal coefficients in the proposed model, two solutions are provided based on frequency-domain modeling. Experimental verification is given to proof the accuracy of the proposed thermal modeling method considering the ambient temperature dynamics.