Analysis and Mitigation of EMC Effects of Electric Resonances in Circuits

Abstract

In the paper the LC resonance issue is addressed. An approach is discussed based on normalized parameters modeling the conditions under which detrimental EMC resonance effects may occur. The analysis starts from a case-study circuit, where closed-form expressions are derived together with normalized figures of merit. Then, a meaningful example is provided showing that spectral phenomena possibly leading to fail of EMC compliance may be due to resonance with very high-order harmonic frequencies. The proposed approach enable a quick understanding of the effects of the involved circuit parameters, and hence provide a designer a method for troubleshooting and resolution of resonance issues.