Analyze And Research On The Electromagnetic Compatibility Of Half Bridge QRC Converter

To avoid the blindness and limitation of trade-off method on the resolving of SMPS EMI, this paper presents a new research method which is based on using the Cadence software. This paper has established the PCB trace noise model of SMPS, extracted its parasitic elements and simulated its EMI level. It has also realized the computer aided EMC analyse and computer aided optimized PCB layout. So we can suppress the potential noise source early at PCB design period.We choose HB QRC convert as the research object. This paper has completely analyzed the circuit work modes, designed an experimental device, analyzed the mam noise source, established the common-mode and different-mode noise current models, extracted the parasitic elements of four PCB layout and simulated each EMI level. Based on these, it has derived the element which have great effect on PCB EMC and has designed the optimized PCB layout.This paper presents a reasonable and effective research method to resolve the SMPS EMI and design PCB with good EMC performance.