Journal ArticleDOI
A comparative study of carrier-frequency modulation techniques for conducted EMI suppression in PWM converters
TLDR
It is shown that randomCFM (RCFM) gives a more effective way to disperse the harmonics around the switching frequency than the periodic CFM (PCFM) with the same frequency deviation, however, RCFM introduces higher low-frequency harmonics than the PCFM at the converter output.Abstract:
A rigorous mathematical analysis and a comparative study of carrier-frequency modulation (CFM) techniques for the conducted electromagnetic interference (EMI) suppression in pulsewidth-modulated converters is presented. CFM techniques dither the switching period with a small amplitude variation around the nominal value, so that the harmonic power is redistributed over the spectrum of concern. Two types of dithering signals, including the periodic and random signals, are investigated in this paper. The operational characteristics as well as the input and output power spectra of the converters with the two modulating signals are compared. In particular, their characteristics in the low- and high-frequency harmonic power redistribution will be depicted. It is shown that random CFM (RCFM) gives a more effective way to disperse the harmonics around the switching frequency than the periodic CFM (PCFM) with the same frequency deviation. However, RCFM introduces higher low-frequency harmonics than the PCFM at the converter output. Furthermore, effects of the resolution filter bandwidth in the electromagnetic compatibility analyzer on conducted EMI measurement is discussed. The validity of the analyses is confirmed experimentally by using a dc/dc buck converter operating in continuous conduction mode.read more
Citations
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Journal ArticleDOI
Communication systems: An introduction to signals and noise in electrical communication
Journal ArticleDOI
EMI Reduction via Spread Spectrum in DC/DC Converters: State of the Art, Optimization, and Tradeoffs
TL;DR: The most common and most efficient known spreading techniques are considered, looking for spreading parameters that ensure the highest EMI reduction and the lowest performance reduction in the circuit where the spreading is applied.
Journal ArticleDOI
FPGA Implementation of a Switching Frequency Modulation Circuit for EMI Reduction in Resonant Inverters for Induction Heating Appliances
TL;DR: The use of frequency modulation as a spread spectrum technique to reduce conducted electromagnetic interference (EMI) in the A frequency band caused by resonant inverters used in induction heating home appliances is presented.
Journal ArticleDOI
Electromagnetic Vibration and Noise of the Permanent-Magnet Synchronous Motors for Electric Vehicles: An Overview
Wenzhe Deng,Shuguang Zuo +1 more
TL;DR: The state of the art and recent progress of the electromagnetic vibration and noise of PMSMs for electric vehicles are presented, with emphasis on the induced mechanism, prediction method, suppression method, and sound quality.
Journal ArticleDOI
A Review of Spread-Spectrum-Based PWM Techniques—A Novel Fast Digital Implementation
TL;DR: An insight is provided into the SS techniques: its history, its types, and mainly its ability to mitigate the EMI problem in the SMPS domain and a new fast digital implementation method based on a dsPIC33F microcontroller is presented.
References
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Book
Advanced Engineering Mathematics
TL;DR: In this article, the authors discuss Advanced Engineering Mathematics, Advanced engineering mathematics (AEM) and Advanced Engineering Mathematical Programming (AMEMP), with a focus on advanced engineering mathematics.
Book
Communication systems: an introduction to signals and noise in electrical communication
TL;DR: Information and Detection Theory Appendix: Circuit and System Noise.
Journal ArticleDOI
Communication systems: An introduction to signals and noise in electrical communication
Journal ArticleDOI
Reduction of power supply EMI emission by switching frequency modulation
TL;DR: In this article, the effect of frequency modulation on power supply EMI noise is investigated, and significant reduction of EMI emission is possible with the proposed scheme, which is shown to reduce the EMI emissions significantly.
Journal ArticleDOI
Acoustic noise reduction in sinusoidal PWM drives using a randomly modulated carrier
TL;DR: In this paper, the switching pattern can be randomized by modulating the triangle carrier in sinusoidal PWM (pulse-width modulation) with bandlimited white noise, which can be used to avoid the concentration of harmonic energy in distinct tones.