When selecting chokes for EMC filtering, it's important to consider their frequency response. A choke's nominal (or rated) performance can differ significantly from its actual behavior at high frequencies, making it vital to utilize models that can accurately predict their real behavior.
At the forefront of this research is a group of scientists from The University of Sherbrooke and Hydro-Quebec Research Institute in Canada. They have developed a high-frequency model of toroidal chokes using nanocrystalline alloy cores, which could offer improved EMC performance.
This research has been documented in an article titled "High frequency model of nanocrystalline toroidal chokes for EMC filtering," published in the IEEE Transactions on Industrial Electronics journal.
The researchers utilized nanocrystalline alloy cores with high magnetic permeability and low coercivity to design the toroidal chokes. These materials are suitable for high-frequency applications due to their superior magnetic properties compared to traditional ferrite cores.
The team developed a high-frequency model for their nanocrystalline-based chokes by analyzing their inductance, parasitic capacitance, resistance, and losses. They also took into account the skin effect, which significantly impacts high-frequency performance due to the electromagnetic field penetration depth.
The researchers conducted extensive simulations to validate and optimize their model, demonstrating excellent performance up to 100 MHz. They also fabricated and tested their designs using experimental setups, confirming their model's accuracy and effectiveness in blocking high-frequency disturbances.
The use of nanocrystalline alloy cores in chokes enables higher inductance and improved EMC performance at high frequencies. This development could lead to the production of chokes capable of blocking high-frequency disturbances in a wide range of applications, including those found in renewable energy, automotive, and aerospace industries.
In conclusion, the research conducted by the scientists from The University of Sherbrooke and Hydro-Quebec Research Institute highlights the importance of utilizing accurate models to design and optimize chokes for EMC filtering applications. The use of nanocrystalline alloy cores offers a promising solution that could significantly improve high-frequency performance, making it an attractive option for future industrial applications.