Predicting the influence of placement of passive components on EMI behaviour

The EMI behavior of power electronic systems is severely influenced by the placement of passive components. Particularly filter components are affected by magnetic field coupling reducing filter performance. This contribution demonstrates the urgent demand for a method predicting EMI behavior on a typical power electronic system. The method comprises a combination of circuit and field simulation. Therefore investigations on stray fields of passive components had to be carried out, which enable the derivation of placement rules and furthermore an automated placement. Using the proposed method in the design stage reduces development costs and allows a statement on achievable performance with selected components.