Analysis and Comparison of Audible Noise Caused by Magnetic Components in Switch-Mode Power Supplies Operating in Burst Mode and Frequency-Foldback Mode

In this paper, it is theoretically shown and experimentally verified that operation of switch-mode power supplies in burst mode (BM) results in lower audible noise than operation in frequency-foldback mode (FFM). However, the selection of the switching frequency in a burst package can have a signifi...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-09, Vol.30 (9), p.5299-5308
Main Authors: Huber, Laszlo, Jovanovic, Milan M.
Format: Article
Language:English
Subjects:
Acoustic noise
Audible noise
burst mode
Circuits
Comparative analysis
Constant-Percentage-Bandwidth (CPB) analysis
Electric currents
Electric noise
Electromagnetics
Fast-Fourier-Transform (FFT) analysis
Fourier analysis
Frequencies
frequency-foldback mode
magnetic components
Magnetic cores
Magnetic flux density
Magnetostriction
Noise measurement
Power supply
sound pressure level (SPL)
Switching frequency
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Summary:In this paper, it is theoretically shown and experimentally verified that operation of switch-mode power supplies in burst mode (BM) results in lower audible noise than operation in frequency-foldback mode (FFM). However, the selection of the switching frequency in a burst package can have a significant impact on the audible noise. In both BM and FFM, the audible noise can be reduced by decreasing the peak value of current pulses and proportionally increasing the burst frequency in BM and the switching frequency in FFM. In BM, the audible noise can be further reduced if instead of increasing the burst frequency, the number of burst pulses is increased without changing the burst frequency. The presented BM and FFM audible noise analyses are experimentally verified on a dc-dc boost test circuit.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2366417