Advanced high frequency magnetic components

Advanced high frequency magnetic components are a key element in achieving high conversion efficiency in power converters.

Our research is therefore focused on reducing losses and sizes of magnetic components. To achiece this objective we conduct research into improving methods for analyzing, simulating, designing, manufactoring and testing magnetic components.

Optimum design and test of magnetic components

By Farideh Javidi Niroumand

Reducing the size and the weight of power electronic circuits to achieve high power density leads to applying high switching frequency. However, magnetic components in high frequency applications can cause considerable losses due to two phenomena: skin effect and proximity effect. Skin effect refers to the tendency of the current flow in conductor close to its outer surface. At low frequencies, skin effect is negligible, and current is distributed uniformly across the conductor. Proximity effect is the eddy current flow in the conductor due to the presence of magnetic field generated by nearby conductors.

To increase the efficiency of high frequency operating power electronic converters, power losses should be minimized. This requires an attention to magnetic components- inductors and transformers- where the losses can become huge at high frequencies. Therefore, analyzing and measuring the power losses in magnetic components is essential. Furthermore, winding parasitic capacitors rigorously affects the behavior of the inductive components at high frequencies. Winding’s self-capacitance is responsible for the resonant frequency of inductors and transformers, and cannot be negligible. However, estimating the value of these components is very difficult and various parameters can affect their value such as winding methods and the core shape of the magnetic component.

This project is assigned to study different methods of analyzing and measuring power losses in magnetic components –inductors and transformers - in order to find the optimum design for typical applications. Therefore, the objectives of the project are as follow:

-          Analyzing/measuring the power losses (including core loss and copper loss) of magnetic components;

-          Study the impact of parasitic capacitors upon the performance of these components;

-          Study the behavior of inductors/transformers with different winding methods;

-          Study the performance of magnetic components regarding various core shapes/materials;

-          Finding the optimum design of inductors/transformers for typical applications.