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Inductance dans son environnement : caractérisation des inductances planaires intégrées dans les conditions d'utilisation de l'électronique de puissance

Abstract : In applications of power electronics, inductors are generally used with triangular and rectangular waveforms. In these conditions, inductors cannot be characterized with sinusoidal waveforms. Many methods of characterization are developed, but none of them allow the characterization of integrated magnetic components under conditions compatible with power electronics waveforms. A new real-time characterization method suitable for integrated magnetic components is developed in this thesis. The Device under test is inserted in a DC-DC converter. From u(t) voltage and i(t) current recordings, it is possible to determine the φ(i) hysteresis loop that allows main inductor parameters to be determined: inductance value, core losses, and saturation of the magnetic material. It should be made clear when u(t) and i(t) are recorded, suitable signal processing is completed in order to obtain usable signals. The method has been successfully tested on discrete and integrated inductors with measurement frequencies up to MHz. We have thus shown that this method makes it possible to determine minor loops up to the saturation of the magnetic material and to plot the evolution of the inductance versus the DC bias current.The results show that for very low current values, we have obtained strong values of inductor and these values are constant. However, for the mean current, the inductance value decreases drastically and for strong current values, the magnetic material is saturated which causes very small values of inductor. This method also makes it possible to study the evolution of iron losses under the same conditions of use as those encountered in power electronics
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Submitted on : Thursday, April 18, 2019 - 8:25:12 AM
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Koularambaye Mbaitelbe. Inductance dans son environnement : caractérisation des inductances planaires intégrées dans les conditions d'utilisation de l'électronique de puissance. Electronique. Université de Lyon; Université Cheikh Anta Diop de Dakar, 2017. Français. ⟨NNT : 2017LYSES012⟩. ⟨tel-02103042⟩

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