Faculty of Electronics and Telecommunications Association of Electrical Engineers from Timișoara
Abstract
The paper considers the effect of increasing switching
frequency on a frequency modulated (FM) buck converter
parameters: efficiency, output voltage ripples and
electromagnetic interference (EMI) attenuations. The converter
operating in continuous and discontinuous conduction modes
(CCM and DCM respectively) is analyzed analytically, by
simulations in Simulink and experimentally. The results
obtained show that increasing switching frequency can
significantly reduce the ripples (especially in DCM) and improve
effectiveness of the use of FM to reduce EMI. Impact of
increasing the switching frequency on efficiency of FM
converter is also studied. It is found out that FM does not affect
efficiency within the broad range of switching frequencies. The
analysis provides useful data to improve the effectiveness of the
use of FM in switchmode converters
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