Reducing electromagnetic interference in vehicle mounted LLC resonant converters by segmentation seeking chaotic spread spectrum

Home > Archive>Volume 46, Issue 18, 2023 >45-53

Reducing electromagnetic interference in vehicle mounted LLC resonant converters by segmentation seeking chaotic spread spectrum
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                        Zhang HaojieZhang Haojie
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, China
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Yang WenrongYang Wenrong
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, China
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Luan JunlingLuan Junling
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, China
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Chen GuohangChen Guohang
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, China
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Affiliation:1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, China
Clc Number:TP93
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Abstract:

Due to the electromagnetic interference, the onboard electronic measuring equipment will cause malfunction or malfunction. The traditional chaotic spread spectrum can reduce the electromagnetic interference of the onboard LLC resonant converter from the source, but with the increase of the spread spectrum width, the output voltage ripple will increase and the efficiency will decrease. Based on this, firstly, the chaotic sequence is generated by a lattice multivortex chua′s system, and the chaotic spread spectrum is realized in the way of leftward spread spectrum. Secondly, proposing a segmental traversal optimization algorithm with the rate of change of electromagnetic interference rejection and the rate of change of spreading width as the criterion, combine the prediction model of conducted interference with highfrequency parasitic parameters, and perform the spreading width optimization for different frequency bands specified in the national standard. Finally, the simulation and experimental results verify that the proposed strategy can achieve the maximum 7.07 dB EMI reduction, the maximum 61.5% output voltage ripple reduction, and the circuit efficiency improvement.

Key words:chaotic spread spectrum;spread spectrum width;LLC resonant converter;electromagnetic interference

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Online: January 10,2024
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