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Energies 2017, 10(1), 24; doi:10.3390/en10010024

Novel Frequency Swapping Technique for Conducted Electromagnetic Interference Suppression in Power Converter Applications

1
Department of Electrical Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da’an District, Taipei 106, Taiwan
2
Leadtrend Technology Corporation, No. 1, Taiyuan 2nd St., Zhubei City, Hsinchu County 30288, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Ali M. Bazzi
Received: 9 August 2016 / Revised: 30 November 2016 / Accepted: 19 December 2016 / Published: 27 December 2016
(This article belongs to the Special Issue Power Electronics Optimal Design and Control)

Abstract

Quasi-resonant flyback (QRF) converters have been widely applied as the main circuit topology in power converters because of their low cost and high efficiency. Conventional QRF converters tend to generate higher average conducted electromagnetic interference (EMI) in the low-frequency domain due to the switching noise generated by power switches, resulting in the fact they can exceed the EMI standards of the European Standard 55022 Class-B emission requirements. The presented paper develops a novel frequency swapping control method that spreads spectral energy to reduce the amplitude of sub-harmonics, thereby lowering average conducted EMI in the low-frequency domain. The proposed method is implemented in a control chip, which requires no extra circuit components and adds zero cost. The proposed control method is verified using a 24 W QRF converter. Experimental results reveals that conducted EMI has been reduced by approximately 13.24 dBμV at 498 kHz compared with a control method without the novel frequency swapping technique. Thus, the proposed method can effectively improve the flyback system to easily meet the CISPR 22/EN55022 standards. View Full-Text
Keywords: conduction electromagnetic interference (EMI); frequency swapping; frequency jittering; quasi-resonant flyback (QRF) conduction electromagnetic interference (EMI); frequency swapping; frequency jittering; quasi-resonant flyback (QRF)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kuo, M.-T.; Tsou, M.-C. Novel Frequency Swapping Technique for Conducted Electromagnetic Interference Suppression in Power Converter Applications. Energies 2017, 10, 24.

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