Presentation Description: Accurate inductance and resistance measurements are required when making accurate wideband linear equivalent circuit models of magnetic devices, but the accuracy of both the inductance and resistance measurements are degraded by capacitive effects. This presentation proposes a method of compensating for parallel capacitive effects to more accurately determine the actual inductance and resistance values. The method relies on taking several inductance measurements over a range of frequencies, determining the parallel capacitance, and then processing the inductance and resistance data to produce corrected values in which the effects of the parallel capacitance are significantly diminished. The proposed correction method improves the accuracy of inductance measurements thereby enabling highly-accurate wideband equivalent circuit models of magnetic devices based on measured data. This is particularly useful for engineers designing resonant converters, converters with coupled magnetics and EMI filters. The method also enables producing more accurate datasheet plots for commercial magnetics.
