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Mitigation of Electromagnetic Conducted Interference Using Ferrimagnetic Material Cores

This paper deals with the method of suppressing electromagnetic interferences in low voltage supply ports, using ferrites as the main element. The introductory section is a very short presentation of the terminology and definitions of electromagnetic conducted interference. The next section, the most consistent part of the paper, represents a brief review of the main features of the ferrites in mitigating conducted electromagnetic interference. The introduction of the complex permeability and the formal separation of the two components of the impedance of the ferrites permit to reveal the major distinction between ferrites and metallic magnetic materials. The final section presents a case study carried out in a polluted medical environment, where an EMI filter was retrofit to assure the EMC compliance for electromagnetic conducted interference of the medical equipment. Measurement of the attenuation characteristics in the standard frequency range of 100 kHz-30 MHz, both in differential and common mode, introduced by a common mode choke built in by a toroidal ferrite are also presented.