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Conducted Emission Reduction by Frequency Hopping Spread Spectrum Techniques

Author:
Smys, S., Thara Prakash, J., Raj, Jennifer S.
Source:
National Academy science letters 2015 v.38 no.3 pp. 197-201
ISSN:
0250-541X
Subject:
cost effectiveness, electric current, emissions, energy conversion, frequency
Abstract:
Spreading the switching frequency of a DC–DC converter is a cost effective method for reducing conducted emission. In this paper the main objective is to implement spread spectrum techniques in a digitally controlled DC–DC converter and to reduce conducted emission by modulation. To vary the switching frequency the spectrum can be spread across a band of frequencies and thus reducing the peak amplitude at individual frequencies. Here we introduce two methods Bifrequency technique and spread spectrum techniques. The effect of these techniques in ripple current and output ripple will be analyzed. The analysis is carried out on a digital DC–DC converter which has a PID based control device.
Agid:
4407920