Source current type double-active filter application with triple-LISN for EMI noise problem in induction motor control systems

The source current detection type AF has a merit of robustness to the load variation, but a problem of the resonance between the AF (active filter) and an LC (inductance-capacitance) filter often arises if an LC filter is connected parallel to the AF. In this paper, double-LISN (line impedance stabilization network) circuit based AF, resonance analysis and the simulation results comparing with experimental ones are studied and discussed.