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Dr. Luigi Solimene
Politecnico di Torino

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Research Keywords & Expertise

0 Inductors
0 Power Converters
0 Magnetic Materials
0 Power electronic
0 Electrical Engineering

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Journal article
Published: 26 June 2021 in Energies
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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.

ACS Style

Salvatore Musumeci; Luigi Solimene; Carlo Ragusa. Identification of DC Thermal Steady-State Differential Inductance of Ferrite Power Inductors. Energies 2021, 14, 3854 .

AMA Style

Salvatore Musumeci, Luigi Solimene, Carlo Ragusa. Identification of DC Thermal Steady-State Differential Inductance of Ferrite Power Inductors. Energies. 2021; 14 (13):3854.

Chicago/Turabian Style

Salvatore Musumeci; Luigi Solimene; Carlo Ragusa. 2021. "Identification of DC Thermal Steady-State Differential Inductance of Ferrite Power Inductors." Energies 14, no. 13: 3854.

Journal article
Published: 06 February 2021 in Magnetochemistry
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In this paper, we propose an optimal design procedure for magnetically shielded rooms. Focusing on multi-layer ferromagnetic structures, where inner layers operate at very low magnetic field, we propose an identification method of the magnetic material characteristic in the Rayleigh region. A numerical model to simulate the shielding efficiency of a multi-layer ferromagnetic structure is presented and experimentally tested on different geometries and layer configurations. The fixed point iterative method is adopted to handle the nonlinearity of the magnetic material. In conclusion, the optimization of the design parameters of a MSR is discussed, using the Vector Immune System algorithm to minimize the magnetic field inside the room and the cost of the structure. The results highlight that a linear magnetic characteristic for the material is sufficient to identify the suitable geometry of the shield, but the nonlinear model in the Rayleigh region is of fundamental importance to determine a realistic shielding factor.

ACS Style

Aldo Canova; Fabio Freschi; Luca Giaccone; Maurizio Repetto; Luigi Solimene. Identification of Material Properties and Optimal Design of Magnetically Shielded Rooms. Magnetochemistry 2021, 7, 23 .

AMA Style

Aldo Canova, Fabio Freschi, Luca Giaccone, Maurizio Repetto, Luigi Solimene. Identification of Material Properties and Optimal Design of Magnetically Shielded Rooms. Magnetochemistry. 2021; 7 (2):23.

Chicago/Turabian Style

Aldo Canova; Fabio Freschi; Luca Giaccone; Maurizio Repetto; Luigi Solimene. 2021. "Identification of Material Properties and Optimal Design of Magnetically Shielded Rooms." Magnetochemistry 7, no. 2: 23.

Conference paper
Published: 01 September 2020 in 2020 55th International Universities Power Engineering Conference (UPEC)
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This paper deals with the modelling of ferrite inductors considering weak saturation operating conditions. The proposed methodology is based on a parametric representation of the magnetic characteristic of the inductor that is optimized through a double-step identification/optimization algorithm. The obtained magnetic characteristic is applied in a simulator to compute the inductor current. To demonstrate the effectiveness of this approach the inductor is tested in a DC-DC buck power converter. Two experimental cases are presented: the former regarding a low voltage, low current, MOSFETs buck converter; the second case regarding a 110W GaN-based buck converter up to 1MHz.

ACS Style

Luigi Solimene; Salvatore Musumeci; Carlo Ragusa. Saturable Ferrite Inductor Parameters Obtained Through a Double Step Optimization. 2020 55th International Universities Power Engineering Conference (UPEC) 2020, 1 -6.

AMA Style

Luigi Solimene, Salvatore Musumeci, Carlo Ragusa. Saturable Ferrite Inductor Parameters Obtained Through a Double Step Optimization. 2020 55th International Universities Power Engineering Conference (UPEC). 2020; ():1-6.

Chicago/Turabian Style

Luigi Solimene; Salvatore Musumeci; Carlo Ragusa. 2020. "Saturable Ferrite Inductor Parameters Obtained Through a Double Step Optimization." 2020 55th International Universities Power Engineering Conference (UPEC) , no. : 1-6.

Conference paper
Published: 01 June 2020 in 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)
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This paper deals with the modelling of saturable inductors with ferrite core applied in a high frequency synchronous step-down converter, with GaN FETs as switches. The inductor current waveform is modeled and simulated under non-linear conditions, in order to evaluate the dynamic performances and the converter efficiency. The inductor current waveform is analyzed under different loads conditions at a fixed switching frequency. Furthermore, variable switching frequency simulations under fixed load conditions are carried out.

ACS Style

Salvatore Musumeci; Luigi Solimene; Carlo Ragusa; Marco Palma; Olivier De La Barriere. Saturable Inductor Modelling in GaN FETs Based Synchronous Buck Converter. 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM) 2020, 396 -401.

AMA Style

Salvatore Musumeci, Luigi Solimene, Carlo Ragusa, Marco Palma, Olivier De La Barriere. Saturable Inductor Modelling in GaN FETs Based Synchronous Buck Converter. 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). 2020; ():396-401.

Chicago/Turabian Style

Salvatore Musumeci; Luigi Solimene; Carlo Ragusa; Marco Palma; Olivier De La Barriere. 2020. "Saturable Inductor Modelling in GaN FETs Based Synchronous Buck Converter." 2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM) , no. : 396-401.

Journal article
Published: 20 January 2020 in Journal of Magnetism and Magnetic Materials
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In this paper we propose a model for the analysis of the current waveform in ferrite power inductors subjected to large-signal square-wave voltage, a typical regime of present-day switch-mode power supplies. This problem is characterized by the non-linear response of the inductor across a wide range of current values, up to the limit of inductor saturation. Consequently, non-linear differential equations must be adopted in the description of the circuit. In this paper, we solve the equations of the circuit through an effective iterative method, by which the current waveform is computed through successive approximations. These results are eventually verified by comparison with experiments performed on a commercial buck-type converter.

ACS Style

Carlo Ragusa; Luigi Solimene; Salvatore Musumeci; Olivier de la Barriere; Fausto Fiorillo; Giulia Di Capua; Nicola Femia. Computation of current waveform in ferrite power inductors for application in buck-type converters. Journal of Magnetism and Magnetic Materials 2020, 502, 166458 .

AMA Style

Carlo Ragusa, Luigi Solimene, Salvatore Musumeci, Olivier de la Barriere, Fausto Fiorillo, Giulia Di Capua, Nicola Femia. Computation of current waveform in ferrite power inductors for application in buck-type converters. Journal of Magnetism and Magnetic Materials. 2020; 502 ():166458.

Chicago/Turabian Style

Carlo Ragusa; Luigi Solimene; Salvatore Musumeci; Olivier de la Barriere; Fausto Fiorillo; Giulia Di Capua; Nicola Femia. 2020. "Computation of current waveform in ferrite power inductors for application in buck-type converters." Journal of Magnetism and Magnetic Materials 502, no. : 166458.

Conference paper
Published: 01 November 2019 in 2019 26th IEEE International Conference on Electronics, Circuits and Systems (ICECS)
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This paper deals with a method by which the experimental characterization of a power inductor is obtained from onboard measurements that exploits a low-cost DC-DC buck converter to supply the inductor under test with quasi-rectangular voltage waveforms of different amplitudes and bias conditions. The measurements of the voltage $v_{\mathrm{L}}(t)$ across the inductor and the current $i_{\mathrm{L}}(t)$ are performed up to inductions approaching the magnetic saturation. After suitable integration of $v_{\mathrm{L}}(\mathrm{t})$ , the magnetic flux is obtained as a function of $i_{\mathrm{L}}$ and the accuracy of the described identification process is checked by comparing the measured waveform of the current to numerical simulation of the same quantity obtained assuming as input the DC current component and the measured voltage waveform.

ACS Style

Luigi Solimene; Carlo Ragusa; Salvatore Musumeci; Olivier De La Barriere; Fausto Fiorillo. Modeling of Saturable Inductors for Application in DC-DC Converters. 2019 26th IEEE International Conference on Electronics, Circuits and Systems (ICECS) 2019, 839 -842.

AMA Style

Luigi Solimene, Carlo Ragusa, Salvatore Musumeci, Olivier De La Barriere, Fausto Fiorillo. Modeling of Saturable Inductors for Application in DC-DC Converters. 2019 26th IEEE International Conference on Electronics, Circuits and Systems (ICECS). 2019; ():839-842.

Chicago/Turabian Style

Luigi Solimene; Carlo Ragusa; Salvatore Musumeci; Olivier De La Barriere; Fausto Fiorillo. 2019. "Modeling of Saturable Inductors for Application in DC-DC Converters." 2019 26th IEEE International Conference on Electronics, Circuits and Systems (ICECS) , no. : 839-842.