<p>In this study, the conducted emission levels of a circuit containing a nonlinear load and equipped with a DC–DC buck converter module have been predicted using modeling and simulation methods. Additionally, the number and values of decoupling capacitors used in this circuit have been optimized through a differential evolution algorithm. In this context, two different PCB designs, with and without decoupling capacitors, have been developed. First, the experimental EMC test of the configuration without capacitors has been conducted, followed by the CE test simulation using the SPICE model. When comparing the results, the highest CE level has been found to be 85.63 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$dB\mu V$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mi>B</mi> <mi>μ</mi> <mi>V</mi> </mrow> </math></EquationSource> </InlineEquation> at 202 kHz in the experimental results, and 85.9036 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$dB\mu V$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mi>B</mi> <mi>μ</mi> <mi>V</mi> </mrow> </math></EquationSource> </InlineEquation> in the simulation results. Subsequently, an optimization based on a differential evolution algorithm has been performed using co-simulation between MATLAB/Simulink and PSpice. The obtained capacitor values have been applied to the physical circuit, and EMC tests have been repeated. When comparing these test and simulation results, the highest CE level has been measured at 82.49 <InlineEquation ID="IEq3"> <EquationSource Format="TEX">$dB\mu V$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mi>B</mi> <mi>μ</mi> <mi>V</mi> </mrow> </math></EquationSource> </InlineEquation> at 210 kHz in the experimental results, and 81.802 <InlineEquation ID="IEq4"> <EquationSource Format="TEX">$dB\mu V$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mi>B</mi> <mi>μ</mi> <mi>V</mi> </mrow> </math></EquationSource> </InlineEquation> in the simulation results. These findings suggest that optimizing decoupling capacitors can improve EMC performance. The research results demonstrate that predicting conducted emission tests through computer-based simulations and design optimization with a differential evolution algorithm is possible.</p>

Decoupling Capacitor Optimization to Reduce Conducted Emission of DC–DC Buck Converter Based on Differential Evolution Algorithm

期刊论文
发表日期：

2025年11月11日

查看全文

Oğuzhan Coşkun,
Sibel Yenikaya,
Güneş Yılmaz

摘要

In this study, the conducted emission levels of a circuit containing a nonlinear load and equipped with a DC–DC buck converter module have been predicted using modeling and simulation methods. Additionally, the number and values of decoupling capacitors used in this circuit have been optimized through a differential evolution algorithm. In this context, two different PCB designs, with and without decoupling capacitors, have been developed. First, the experimental EMC test of the configuration without capacitors has been conducted, followed by the CE test simulation using the SPICE model. When comparing the results, the highest CE level has been found to be 85.63 $dB\mu V$ $d B μ V$ at 202 kHz in the experimental results, and 85.9036 $dB\mu V$ $d B μ V$ in the simulation results. Subsequently, an optimization based on a differential evolution algorithm has been performed using co-simulation between MATLAB/Simulink and PSpice. The obtained capacitor values have been applied to the physical circuit, and EMC tests have been repeated. When comparing these test and simulation results, the highest CE level has been measured at 82.49 $dB\mu V$ $d B μ V$ at 210 kHz in the experimental results, and 81.802 $dB\mu V$ $d B μ V$ in the simulation results. These findings suggest that optimizing decoupling capacitors can improve EMC performance. The research results demonstrate that predicting conducted emission tests through computer-based simulations and design optimization with a differential evolution algorithm is possible.