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| Characteristics Research for Planar Common Mode EMI Filter Based on Toroidal LC Coil |
| Wang Shishan, Zhu Ye, Zhou Xiaolin, Wu Lifang |
| Nanjing University of Aeronautics and Astronautics Nanjing 210016 China |
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Abstract Planar LC coil is the basic unit constituted planar EMI filter, of which stray capacitance and non-linear permeability of magnetic core have important impact on high-frequency performances of filter. A novel passive integrated structure, the toroidal planar LC coil, is presented firstly, and the 3D finite element simulation of the rectangle and toroidal planar LC coil is done. By comparing the characteristics between them, the toroidal planar LC coil is used as the basic unit, and planar common mode(CM) filter is achieved based on this structure. Distributed parameters such a stray capacitance, magnetic coupling between conductors and non-linear characteristics of the magnetic core are all considered, and then the equivalent lumped parameter circuit is built. The insertion loss is achieved through node voltage method based on the equivalent circuit when it is connected as low-pass filter. A prototype of planar CM filter is implemented based on toroidal planar LC coil. Contrasting calculated results and measured one, it is shown that stray capacitance and non-linear permeability of magnetic core have important impact on high-frequency performances of filter.
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Received: 09 July 2010
Published: 07 March 2014
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2011, Vol. 26 
