Experimental study on nonlinear behavior of Buck converter as noise generator and its influence on vibroacoustic systems

The Power Distribution Network of a PCB based system is largely influenced by the switching noise from power converters. This paper presents the nonlinear behavior of the DC-DC Buck converter as EMI generator. Time sensitive data collector are based on high speed real time systems which require high quality of power and ground distribution network. By analyzing the interferences generated by the switching noise of the converters there can be made improvements over the Power Integrity of the PCB and overall performance and measurement accuracy of system. In this paper are presented two types of switching regimes of the Buck converter: periodic switching and random switching. A spectral analysis of the output waveform voltage is used to compare both their influence in the system. An experimental model using the Buck converter as noise generator is studied and its behavior influence on the vibroacoustic measurements domain is analyzed. The experimental study will provide useful information for vibroacoustic embedded system designers.

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