Temperature dependence of electrical parameters of SMD ferrite components for EMI suppression

Stojanović, Goran; Damnjanović, Mirjana; Živanov, Ljiljana

doi:10.1016/j.microrel.2008.03.020

Cited by 2 publications

(1 citation statement)

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“…Real part μ r determines the inductance L = μ r · L 0 , where is L 0 inductance of the inductor in the air, whereas imaginary part μ r dominantly determines the resistance R ≈ μ r · L 0 at higher frequencies (skin effect can be neglected, as it is explained in [13]). Since the permeability is frequency and temperature dependent, the inductor will change its behavior at different working temperatures and frequencies [14].…”

Section: Measured Results Of Influence Of DC Biasmentioning

confidence: 99%

Influence of DC Bias on the Electrical Characteristics of SMD Inductors

et al. 2015

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As the dc bias flows through a ferrite chip surface mount device (SMD) inductor, it tends to premagnetize the core and reduce its inductance and impedance. It is observed that this drop is especially emphasized when the dc current exceeds the safety limit given by the manufacturer. Therefore, it is necessary to investigate and predict the degree of electrical characteristics degradation as well as the dependence of the core losses on core temperature. In this paper, a measurement technique for the investigation of the influence of dc bias on the electrical characteristics of SMD inductors (i.e., inductance, resistance, Q factor, and real and imaginary part of impedance) for printed circuit board applications is presented. Analysis is based on the model of the SMD inductor, which can be presented as a two-port equivalent circuit with intrinsic and extrinsic parameters. For calculation of the parameters of the SMD inductor, extracted from measured S-parameters using vector network analyzer, the in-house software tool IndCalc was used.

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Section: Measured Results Of Influence Of DC Biasmentioning

confidence: 99%