EMI Filter Performance for Photovoltaic Applications Considering Termination Impedances

This paper proposes an analytical approach to investigate attenuation characteristics for the performance of electromagnetic interference (EMI) filters. Since source and load impedances are unknown, effect of its degradation can only be observed by output measurement data. Based on a definition of insertion loss (see CISPR 17) and experimental data, the performance of propagation path can be analyzed. This approach can also predict possible variation of actual attenuation following termination impedances and parasitic components. Based on comprehensive results, mitigation disturbance can be used to clarify the EMI filter performance for small-scale photovoltaic applications.