Zhang Haojie
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, ChinaYang Wenrong
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, ChinaLuan Junling
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, ChinaChen Guohang
1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, China1.College of Electrical Engineering， Hebei University of Technology, Tianjin 300130, China; 2.State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry, Hebei University of Technology, Tianjin 300130, China
TP93
Due to the electromagnetic interference, the onboard electronic measuring equipment will cause malfunction or malfunction. The traditional chaotic spread spectrum can reduce the electromagnetic interference of the onboard 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 multivortex 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 highfrequency 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.
