Reduction of conducted EMC using busbar stray elements

Busbar structures must first achieve the principal function of a low inductive, multiport interconnection. Therefore, large sheets, very close to each other are used. An interesting issue is to use the inherent capacitive effects of busbars for achieving an integrated EMI filter function. However, this may not cause any inductance degradation. Busbar topology including the ground potential brings some EMC filtering capability. A multilayer topology is proposed to both increase the capacitances of interest and decrease the stray inductance. This has been validated using simulations and experimental results. Finally, multipurpose busbars (Electrical link, Mechanical support, thermal dissipator, EMC filter) may be one of the future key points of Power Electronics integration.