Abstract:Recent works on System-In-Package component pointed out that its in-package inductor is the hottest part. It occurs that thermal stresses due to joule heating and magnetic losses can be damaging. The present study focuses on low profile, surface-mounted, Soft Magnetic Composite inductors to define their thermal behaviour and then to propose a guideline to create pertinent models. Results highlight the impact of thermal conductivity of composite core on temperatures and the lack of properties data of iron-resin… Show more
“…Ideally, a well-designed electromagnetic system should have no or very low internal energy losses, but this is the seldom case in practical applications [1]. Thermal losses in both coil and SMCs must be handled by different means.…”
The complex interaction between material properties in an induction heating circuit was studied by multi physics simulation and by experimental verification in a fullscale laboratory heater. The work aims to illustrate the complexity of the system of interacting materials, but also to propose a method to verify properties of soft magnetic composite materials in an integrated system and to identify which properties are the most critical under different circumstances and load cases. Heat losses at different loads were primarily studied, from DC currents to AC currents at 15, 20 and 25 kHz, respectively. A FE model for magnetic simulation was correlated with a corresponding model for heat simulation. The numerical model, as well as the established input material data, could be verified through the experimental measurements. In this particular study, the current loss in the litz wire was the dominant heat source, thus making the thermal conductivity of the SMC the most important property in this material.
“…Ideally, a well-designed electromagnetic system should have no or very low internal energy losses, but this is the seldom case in practical applications [1]. Thermal losses in both coil and SMCs must be handled by different means.…”
The complex interaction between material properties in an induction heating circuit was studied by multi physics simulation and by experimental verification in a fullscale laboratory heater. The work aims to illustrate the complexity of the system of interacting materials, but also to propose a method to verify properties of soft magnetic composite materials in an integrated system and to identify which properties are the most critical under different circumstances and load cases. Heat losses at different loads were primarily studied, from DC currents to AC currents at 15, 20 and 25 kHz, respectively. A FE model for magnetic simulation was correlated with a corresponding model for heat simulation. The numerical model, as well as the established input material data, could be verified through the experimental measurements. In this particular study, the current loss in the litz wire was the dominant heat source, thus making the thermal conductivity of the SMC the most important property in this material.
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