Modelování chlazení tranzistorových zesilovačů

Abstract

This Bachelor thesis deals with the modeling of cooling power transistor amplifiers working in classes AB and D. In the introduction of the work are briefly summarised the principles of function the amplifiers in the classes A, B, AB, C, and D. Dissipation of the thermal energy from the chip of the transistor significantly participate proper functioning and trouble-free operation of the device. In order to ensure the proper and long-term functions of the equipment, are nowadays high demands on effective dissipation of the heat energy. For this reason are used modelling programs based on the finite element method. The model of the end stage amplifier transistor was created by using the COMSOL Multiphysics program and dissimilar properties, based on the presuppositions of the different effectiveness of compared amplifiers of the class AB and D, acts on it. The aim of this work is to create model of the cooling these transistors in the specified classes and the resulting models compare and evaluate.