Comparison of radiated emissions from different heatsink configurations

This paper investigates by means of numerical simulations the influence that different heatsink configurations have on the generation of radiated emissions. The effects of a subdivision of the heatsink among the different switching devices of a switched-mode power supply are examined. The plots of the electric near field for different excitation conditions are analyzed in terms of the surface current density distribution on the heatsink configurations. The electric far field as a function of frequency is obtained transforming the time-domain waveforms into the frequency domain and the influence of the heatsink geometry and source location is discussed.