Abstract
Common mode (CM) electromagnetic interference (EMI) has been a difficult subject in electromagnetic compatibility (EMC) analysis and design of power converters for electric vehicles (EV) because of its complex formation mechanism and hidden propagation path. This paper studies a new mechanism of CM conducted emission caused by the leakage flux of a toroidal inductor in the main circuit of a boost DC/DC converter. The stray magnetic source and the CM inducted loops are firstly identified out by simulation analysis and experiments. Then a comprehensive conducted emission circuit model including magnetic coupling parameters is built to explain this CM EMI formation mechanism. Finally, several effective magnetic coupling suppression methods are proposed and verified, such as changing the installation angle of the inductor and the shape of the magnetic core. The research results are helpful to the EMC understanding and design of power electronic converters.
Highlights
While the power electronic converters in an electric vehicle (EV) provide electric energy for the power chain and various electronic loads efficiently, they form conductive or radiated electromagnetic interference (EMI) inside and outside the vehicle due to their fast switching work, which potentially endangers the safe operation of the electric vehicle [1]
It is very necessary to study various near field coupling effects and their suppression methods for a power electronic converter
Researchers all over the world have conducted a variety of studies on the phenomena of near field coupling EMI in power electronic converters [4,5,8,9,10,11,12,13,14]
Summary
While the power electronic converters in an electric vehicle (EV) provide electric energy for the power chain and various electronic loads efficiently, they form conductive or radiated electromagnetic interference (EMI) inside and outside the vehicle due to their fast switching work, which potentially endangers the safe operation of the electric vehicle [1]. Researchers all over the world have conducted a variety of studies on the phenomena of near field coupling EMI in power electronic converters [4,5,8,9,10,11,12,13,14] These researches mainly focus on the attenuation performance deterioration of the EMI filter caused by its internal coupling effect [4,9,10,11,12]. The cause, description circuit model and suppression design techniques of this abnormal EMI phenomenon are described and verified in detail in this paper The essence of this EMI phenomenon is that the stray magnetic field of the toroidal power inductor of the boost converter forms a CM magnetic coupling, which penetrates the conductors of the main circuit, Cy capacitors and metal enclosure, and causes excessive CM conducted emission in the range of 150 kHz–2 MHz. The contents of this paper are organized as follows.
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