Identification of DC Thermal Steady-State Differential Inductance of Ferrite Power Inductors

Salvatore Musumeci, Luigi Solimene and Carlo Stefano Ragusa
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Salvatore Musumeci: Dipartimento Energia “G. Ferraris”, Politecnico di Torino, 10129 Torino, Italy
Luigi Solimene: Dipartimento Energia “G. Ferraris”, Politecnico di Torino, 10129 Torino, Italy
Carlo Stefano Ragusa: Dipartimento Energia “G. Ferraris”, Politecnico di Torino, 10129 Torino, Italy

Energies, 2021, vol. 14, issue 13, 1-15

Abstract: In this paper, we propose a method for the identification of the differential inductance of saturable ferrite inductors adopted in DC–DC converters, considering the influence of the operating temperature. The inductor temperature rise is caused mainly by its losses, neglecting the heating contribution by the other components forming the converter layout. When the ohmic losses caused by the average current represent the principal portion of the inductor power losses, the steady-state temperature of the component can be related to the average current value. Under this assumption, usual for saturable inductors in DC–DC converters, the presented experimental setup and characterization method allow identifying a DC thermal steady-state differential inductance profile of a ferrite inductor. The curve is obtained from experimental measurements of the inductor voltage and current waveforms, at different average current values, that lead the component to operate from the linear region of the magnetization curve up to the saturation. The obtained inductance profile can be adopted to simulate the current waveform of a saturable inductor in a DC–DC converter, providing accurate results under a wide range of switching frequency, input voltage, duty cycle, and output current values.

Keywords: ferrite cores; DC–DC converters; saturable inductors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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