Inductance Measurement of Inductors under DC bias using Bode 100

This application note describes an inexpensive method for characterizing the drop in inductance of an inductor at any desired DC bias current using the Bode 100 vector network analyzer.

The need for such a measurement is that most inductors' datasheets do not have data on inductance versus current, though some do give data on current corresponding to a 10% drop in Inductance. Likewise, information about Inductance versus frequency is usually unavailable.

The method presented here can be used to gather data on inductance versus current as well as frequency. 

Application note: Inductance measurement of Inductors under DC bias using Bode 100

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Vinod Chellat Markose is a hardware engineer with more than 21 years of experience in hardware design. He graduated with a Bachelor of Engineering in Electrical and Electronics from Visvesvaraya Technological University, India, in 2002. Vinod has worked as a Power Electronics design engineer in industries like Renewable energy, Automotive, Consumer Electronics, and Oil & Gas. He is passionate about analogue electronics, magnetic design, circuit simulations, EMC and protection circuit design with emphasis on robustness to surge. Vinod enjoys spending extensive time with physical components, analyzing the gap between ideal and real-life component behaviors. Since 2019, he has offered Electronic design consultancy services in Power Electronics and low-power analog (both in product design and root-cause analysis of mass failures). Vinod enjoys involving himself in spiritual and humanitarian activities in his free time.
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