利用PCB线圈消除滤波电容器的寄生电感

电源系统中，EMI 滤波器是抑制电磁干扰的重要部件，但是其高频性能受限于元器件的寄生效应。本文针对差模滤波电容，设计一种PCB 耦合线圈消除其寄生电感，以此改善电容器滤波性能。首先，分析了滤波电容器寄生电感的消除原理；提出了一种绕制PCB 电感线圈的新方法，建立了PCB 电感器3D 有限元模型，基于以上分析，给出了适合消除电容器寄生电感的PCB 耦合电感器的设计步骤；最后，通过实验验证了本文设计方法的正确性与有效性。
Abstract：In power applications, the EMI filters which high frequency performance suffers from the parasitic parameters of passive components are important for attenuating electrical ripple, and eliminating electromagnetic interference. A sort of PCB coupled inductor is designed to effectively nullify the parasitic of differential-mode capacitors for EMI filters in this paper, thereby improving its high-frequency filtering performance. The principle of eliminating parasitic inductance is firstly analyzed. A new technique to coiling PCB windings is introduced, and the 3D finite element model of PCB inductor is built.The designing rules of PCB inductor for the applications to eliminating parasitic inductance is summed up based on coiling and calculating. Finally, the design of such PCB windings for inductance cancellation is explored and applicable designing rules experimentally validated.