Emission reduction with spread spectrum clocking for switched capacitor buck converter

Volha Subotskaya, Kyrylo Cherniak, Klaus Hoermaier, Bernd Deutschmann

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The reduction of electromagnetic emissions (EME) in switch mode power supplies (SMPS) has high importance especially in automotive applications. The main methods to influence the switching behaviour of SMPS are external filters, spread spectrum techniques and output driver circuits. This paper presents the application of the spread spectrum technique for a 1.25 V and 1.851 MHz switched capacitor buck converter with a digital control loop to reduce the conducted emissions. The frequency modulated sawtooth and pseudo-random profiles are implemented in the digital controller and discretized by a 100 MHz system digital clock. The work investigates the influence of the profile's modulation frequency and the effect of the pulse width modulation (PWM) resolution limitation on the EME reduction. The improvement using a sawtooth profile of 10 dBuV in comparison to the non-modulated PWM signal is seen and discussed. The comparison between modulated and non modulated output voltage ripple is also presented.

Original languageEnglish
Title of host publication2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility, EMC/APEMC 2018
PublisherInstitute of Electrical and Electronics Engineers
Pages297-302
Number of pages6
ISBN (Electronic)9781509059973
DOIs
Publication statusPublished - 22 Jun 2018
Event60th IEEE International Symposium on Electromagnetic Compatibility and 9th IEEE Asia-Pacific Symposium on Electromagnetic Compatibility, EMC/APEMC 2018 - Suntec City, Singapore
Duration: 14 May 201818 May 2018

Conference

Conference60th IEEE International Symposium on Electromagnetic Compatibility and 9th IEEE Asia-Pacific Symposium on Electromagnetic Compatibility, EMC/APEMC 2018
CountrySingapore
CitySuntec City
Period14/05/1818/05/18

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Safety, Risk, Reliability and Quality
  • Radiation

Fields of Expertise

  • Information, Communication & Computing

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  • Cite this

    Subotskaya, V., Cherniak, K., Hoermaier, K., & Deutschmann, B. (2018). Emission reduction with spread spectrum clocking for switched capacitor buck converter. In 2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility, EMC/APEMC 2018 (pp. 297-302). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/ISEMC.2018.8393786