This paper demonstrates how conducted Electromagnetic Interference (EMI) can be easily analysed utilising an inexpensive and user friendly software package called Micro Cap 9 developed by Spectrum Software®. Other software packages generally used for accurate conducted EMI simulation purposes, such as SABER® is inaccessible to the general designer due to cost. The buck converter is shown as an example. Comparison is made between common mode currents in a standard two-level converter and also three-level derivations. Advantages of three-level converters include reduced switch voltage stress, lower distortion reactive power demand and improved dynamic response. The lower dv/dt should lead to lower electromagnetic noise generation. This paper will show that three-level buck DC-DC converters in general generate much lower common mode currents than conventional two-level buck converters. Further, reductions in common mode currents are achieved by using the improved three-level topologies that have been recently proposed.
Reference:
Grobler, I and Gitau, M.N. 2009. Common mode noise in three-level DC-DC converters. In: IEEE Africon 2009, Nairobi, Kenya, 23-25 September 2009
Grobler, I., & Gitau, M. (2009). Common mode noise in three-level DC-DC converters. IEEE Xplore. http://hdl.handle.net/10204/7012
Grobler, Inus, and MN Gitau. "Common mode noise in three-level DC-DC converters." (2009): http://hdl.handle.net/10204/7012
Grobler I, Gitau M, Common mode noise in three-level DC-DC converters; IEEE Xplore; 2009. http://hdl.handle.net/10204/7012 .