Inductors are plentiful in power electronics. Theyâ€™re used for input EMI filters, output EMI filters, and switching inductors for various switching regulator topologies. Recently, it has become even more necessary to measure inductors with bias, due to an increase in counterfeit magnetic cores. Measuring these inductors with DC bias has been difficult, particularly as DC/DC converters and step-down regulators exceed 90 Amps. The bias sources are expensive, large, and heavy. In this session weâ€™ll show two accurate, low cost, highly portable methods of measuring frequency dependent inductance, with DC Bias effects included.
One method uses a Frequency Response Analyzer to measure inductors biased up to 20 Amp. The other method uses the 2-port shunt through VNA setup to measure inductors up to 125 Amps. Both of these methods are highly portable and utilize power supplies that you likely already have.