Research on Hybrid Modulation Technology of Switching Signal Based on CLLLC Converter
It is found that the CLLLC resonant converter will have specific high-order harmonic pollution at the output end,which will affect the local parallel resonance and series resonance,and generate EMI problems that will interfere with adjacent systems and reduce communication quality.Targeting at the above problems,a new mixed modulation signal method is designed.The modulated switching signal with specific switching frequency and duty cycle is output through DSP control,reducing external circuits and reducing circuit complexity.The harmonic spectrum energy of the output voltage is converted from centralized to decentralized,and the peak value caused by the superposition of output high-order harmonic energy is reduced.A 150 W CLLLC resonant converter experimental platform is built.The experimental analysis shows that the improved modulation technology has a good effect in reducing specific high-order har-monics.The experimental results verify the feasibility of mixed modulation signals on the CLLLC topology converter.
variable duty cycleCLLLChigher harmonicshigh frequency switchhybrid modulation
万方数据
维普
