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

Author

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  • Ming-Tse Kuo

    (Department of Electrical Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da’an District, Taipei 106, Taiwan)

  • Ming-Chang Tsou

    (Leadtrend Technology Corporation, No. 1, Taiyuan 2nd St., Zhubei City, Hsinchu County 30288, Taiwan)

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.

Suggested Citation

  • Ming-Tse Kuo & Ming-Chang Tsou, 2016. "Novel Frequency Swapping Technique for Conducted Electromagnetic Interference Suppression in Power Converter Applications," Energies, MDPI, vol. 10(1), pages 1-23, December.
    • Handle: RePEc:gam:jeners:v:10:y:2016:i:1:p:24-:d:86241
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    References listed on IDEAS

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    2. Ming-Tse Kuo & Ming-Chang Tsou, 2015. "Simulation of Standby Efficiency Improvement for a Line Level Control Resonant Converter Based on Solar Power Systems," Energies, MDPI, vol. 8(1), pages 1-18, January.
    3. Eliana Arango & Carlos Andres Ramos-Paja & Javier Calvente & Roberto Giral & Sergio Serna, 2012. "Asymmetrical Interleaved DC/DC Switching Converters for Photovoltaic and Fuel Cell Applications—Part 1: Circuit Generation, Analysis and Design," Energies, MDPI, vol. 5(11), pages 1-34, November.
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