Scientific and Technical Journal

ELECTROTECHNIC AND COMPUTER SYSTEMS

ISSN Print 2221-3937
ISSN Online 2221-3805
ANALYSIS THE EFFECTIVENESS OF SPREAD SPECTRUM TECHNOLOGY TO REDUCE THE LEVEL OF DC/DC CONVERTERS CONDUCTED INTERFERENCE
Abstract:

Switch mode power supplies (SMPS) generated a wide range of conductive and inductive interference. Moreover, the spectrum dominated by discrete components with a switching frequency of a power transistor and its harmonics. The spectrum width can reach several tens of megahertz. Known technology Spread Spectrum, widely used in communication systems, allows expanding the spectrum of the signal, reducing the level of its components to the noise.

The aim of this work is to study the effectiveness of technology use Spread Spectrum to reduce conductive interference when operating DC/DC converters, search methods, modulation parameters of the modulated signals.

For the research was the simulation of a step-down DC/DC Converter in the program NI Multisim. The efficacy of reducing the level of conducted interference estimated by comparing the spectra of the current given by a power supply Converter operating in various modes: with a fixed conversion frequency and time varying.

The results of modeling in NI Multisim confirmed the high efficiency of this technology. Discrete components of the spectrum are blurred in a wide range of frequencies and the level of conducted interference can be lowered by 15...16 dB. Studies have shown that the most effective application for reducing interference using frequency modulation control signal according to a triangular law. The article presents recommendations for selecting the frequency of the modulating signal and the frequency deviation of the modulated oscillations to obtain the maximum of useful effect.

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References

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2017-11-22 03:20:26

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