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Active Suppression of Radiated EMI in Flyback Converter Based on Fractional-order Chaos
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Jiancheng WU1, Ru YANG1, 2, Yufan ZHANG2, Zhenye ZHONG2, Zuolian LIU3
Journal of Power Supply | 2024, 22(2) : 438 - 447
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Journal of Power Supply | 2024, 22(2): 438-447
• EMI/EMC •
Active Suppression of Radiated EMI in Flyback Converter Based on Fractional-order Chaos
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Jiancheng WU1, Ru YANG1, 2, Yufan ZHANG2, Zhenye ZHONG2, Zuolian LIU3
Affiliations
  • 1 School of Electronics and Communication Engineering Guangzhou University Guangzhou 510006 China
  • 2 School of Mechanical and Electrical Engineering Guangzhou University Guangzhou 510006 China
  • 3 School of Physics and Materials Science Guangzhou University Guangzhou 510006 China
Published: 2024-03-30 doi: 10.13234/j.issn.2095-2805.2024.2.438
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The fast on-off switching signal is the main cause of electromagnetic interference (EMI). At present, the research on EMI suppression by chaos mainly focuses on the suppression of conducted EMI by integer-order chaos. On this basis, the suppression by fractional-order chaos on radiated EMI and the selection of optimal order are studied in this paper. First, through the analysis of spectrum characteristics of fractional-order Lorenz and Lyapunov exponent spectrum, 1.8-order Lorenz signal is selected as the best spread spectrum series. Second, based on the principle of EMI suppression technology with variable switching frequency, Lorenz chaotic spread spectrum PWM signals with fixed frequency, integer-order, 2.7-order and 1.8-order are implemented in an STM32 single chip microcomputer. A near-field radiation experiment was carried out on a 5 W flyback converter, which proved that the 1.8-order Lorenz signal had the strongest suppression effect on the near-field magnetic field radiation. Finally, experimental results showed that the prototype's overall efficiency was about 2% different when it was under the fractional-order Lorenz Chaos PWM control and constant-frequency PWM control, respectively, which verified the superiority of the fractional-order chaotic PWM in radiated EMI suppression performance.

Flyback converter  /  fractional-order chaos  /  near-field radiation  /  electromagnetic interference(EMI)
Jiancheng WU, Ru YANG, Yufan ZHANG, Zhenye ZHONG, Zuolian LIU. Active Suppression of Radiated EMI in Flyback Converter Based on Fractional-order Chaos[J]. Journal of Power Supply, 2024 , 22 (2) : 438 -447 . DOI: 10.13234/j.issn.2095-2805.2024.2.438
Funding
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  • Guangdong Natural Science Foundation Team Project(2017B030312001)
  • National Innovation Training Program of Guangzhou University(201911078029)
Appendix
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Year 2024 volume 22 Issue 2
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299
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Article Info
doi: 10.13234/j.issn.2095-2805.2024.2.438
  • Receive Date：2021-06-23
  • Online Date：2025-07-21
  • Published：2024-03-30
Article Data
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History
  • Received：2021-06-23
  • Revised：2021-08-03
  • Accepted：2021-08-23
Funding
Guangdong Natural Science Foundation Team Project(2017B030312001)
National Innovation Training Program of Guangzhou University(201911078029)
Affiliations
    1 School of Electronics and Communication Engineering Guangzhou University Guangzhou 510006 China
    2 School of Mechanical and Electrical Engineering Guangzhou University Guangzhou 510006 China
    3 School of Physics and Materials Science Guangzhou University Guangzhou 510006 China
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