Proceedings ArticleDOI
Random carrier frequency modulation of PWM waveforms to ease EMC problems in switched mode power supplies
A. Stone,B. Chambers,D. Howe +2 more
- pp 16-21
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TLDR
In this paper, a technique of frequency-hopping spread-spectrum modulation is presented to reduce the spectral power density at harmonics of the switching frequency. But the effect of the peak frequency deviation and the modulation sequence length on the resultant spectrum are discussed.Abstract:
Electromagnetic compatibility (EMC) remains an issue which can present many problems to designers of high frequency power converter circuits. Usual techniques for alleviating the problems of interference generation by power converters involve the use of screening materials and filters. However, the effectiveness of such measures depends on the frequency of the interference and the power density at each frequency of interest. As pulse width modulation (PWM) generates high frequency harmonics at multiples of the switching frequency, modulation of the switching frequency may be used to spread the spectral power density present at these harmonic frequencies. This paper presents a technique of frequency-hopping spread-spectrum modulation which may be applied to switched-mode power converters to reduce the spectral power density at harmonics of the switching frequency. The influence of the peak frequency deviation and the modulation sequence length on the resultant spectrum are discussed. These predictions have been broadly confirmed in practice. >read more
Citations
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Methods and circuits for frequency modulation that reduce the spectral noise of switching regulators
TL;DR: In this article, the authors present methods and circuits for spread spectrum frequency modulation that reduce peak spectral noise at the outputs or inputs of switching regulators, and modulates the operating frequency of the switching regulator in accordance with a frequency modulation waveform having a shape coordinated to a peak noise amplitude waveform that describes the correlation between the operating frequencies of a switching regulator and the peak noise at a regulator's input or output.
Journal ArticleDOI
An EMI Reduction Technique for Digitally Controlled SMPS
TL;DR: In this article, a spread spectrum technique and system for reducing average electromagnetic interference (EMI) in low-power digitally controlled dc-dc switch-mode power supplies (SMPS) is introduced.
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Variable frequency switching in power supply EMI-control: an overview
TL;DR: In this paper, an overview of variable-frequency techniques in power electronics with experimental results is presented, and the experimental results show that variable frequency and spread spectrum modulation can also be used in power electronic applications to improve electro-magnetic compatibility (EMC).
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Reduction in Radiation Noise Level for Inductive Power Transfer Systems Using Spread Spectrum Techniques
TL;DR: In this paper, two methods of reducing radiation noise caused by inductive power transfer (IPT) systems using spread spectrum techniques were experimentally demonstrated in electric vehicles (EVs) or plug-in hybrid EVs (PHEVs).
Proceedings ArticleDOI
A Low-Power DC-DC Converter with Digital Spread Spectrum for Reduced EMI
TL;DR: In this article, a 1.8 V step-down DC-DC converter prototype with a hybrid delay-line based digital pulse-width modulator is demonstrated for reducing EMI.
References
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Proceedings ArticleDOI
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Journal ArticleDOI
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