Abstract
Wide-bandgap devices have enabled miniaturization of magnetic components to enhance the power density of the converter. However, parasitic components become dominant at higher switching frequencies that actuate unwanted electromagnetic interference issues. Therefore, it is critical to model and evaluate them in compact magnetic structures. Since multiwinding coupled inductive structures are essential part of multiphase converters, this article introduces a measurement method to compute the parasitic elements of a three-winding coupled inductor. Results of the proposed method are verified by measuring the high-frequency emissions of the high-step-up converter with two inductor structures. Both inductors had similar inductances but different physical dimensions. With application of the proposed measurement methodology, parasitic capacitances of both inductors were computed. Results showed that one inductor structure has higher parasitic capacitance than the other. Since high-frequency emissions of the converter directly depend on the parasitic capacitance of the inductor structure, the emission profile of the converter showed that the converter indeed had lower noise peaks when the inductor with lower capacitance was employed. Hence, these results validate the capacitance trend as predicted by the proposed modeling technique. This method can be employed to any multiwinding coupled inductor to compute its parasitics to optimize the required electromagnetic interference filters.
Highlights
Superior switching properties of Wide Bandgap (WBG)semiconductor devices can enable power converter to achieve higher conversion efficiencies with smaller cooling and passive components requirement [1]–[5]
Higher electromagnetic interference (EMI) would require larger common mode (CM) and differential mode (DM) filters to comply with standards, which would be opposed to the objectives of having high efficiency and high power density in the converter, B
It is clear that there is a need for accurate models capable of representing multi winding magnetic components and their parasitic effects in high frequency with the purpose of reducing EMI emissions in power converters
Summary
Semiconductor devices can enable power converter to achieve higher conversion efficiencies with smaller cooling and passive components requirement [1]–[5]. Since multi-phase coupled inductors offers outstanding advantages by improving efficiency and power density along with reducing the number of required passive components in a power electronics converter [24]–[27], it is vital to have an accurate high frequency model with emphasis in the capacitive effects. [28] presented an application of two winding coupled air core planar inductor to cancel the parasitic inductance of capacitor to enhance the filter performance for high-frequency converter. It is clear that there is a need for accurate models capable of representing multi winding magnetic components and their parasitic effects in high frequency with the purpose of reducing EMI emissions in power converters.
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