Modified Kron's Method (MKME) for EMC optimization, applied to an EMC filter

In filter design, inter-component parasitic couplings play a major role in the filter response. Most often, filter designers try to minimize these couplings through a proper implementation of components; conversely, this paper aims to optimize filter responses through a clever use of these couplings. Previous works have been performed to reach such an objective ([1]–[2]), focusing on the study of LC filters with 3D simulation or PSpice techniques. Moreover, the MKME method has been identified as a promising technique in many design cases. The objective of this paper is to introduce the application of the MKME method to an LC filter, to validate its use and benefits, before deploying it for more complex filter structures.

I. Introduction

Power electronic systems are increasingly used in automotive applications. These systems produce electromagnetic emissions that must be limited by the use of filters, basically composed of capacitors and inductors. It can be noted that the coupling between some of these components (magnetic coupling mainly) may modify the filter attenuation. A typical LC filter considering this coupling, is presented in Fig. 1. Figure 1:

High frequency model of LC filter considering the inter-component coupling [2]