Latest Generation of EMI Suppression (film) Capacitors for xEV Systems

Abstract:
EMI suppression capacitors, as per IEC 60384-14: Fixed capacitors for electromagnetic interference suppression and connection to the supply mains are commonly used to filter undesired EM transients to/from the grid as well as from/to other surrounding systems. The IEC 60384-14 standard is the main reference for the testing and certification of this sub-family of capacitors since the last century. It is a common request in a wide variety of end applications: LED lighting, consumer appliances, solar invert-ers, power supplies, etc., and nowadays, more and more in some xEV systems connected to the power train (on-board charger, DC-DC converters, filters). But IEC 60384-14 cannot effectively scope all the different particularities of every end application or their respective requirements for these capacitors. This paper focuses on the particularities for xEV systems that must be addressed (additionally) for EMI suppression capacitors, such as: parameter drift, operation voltage vs. temperature, high-voltage testing, current distribution, parasitic inductance, AEC-Q200, mounting and soldering heat, etc., with the latest product range of TDK EMI suppression capacitors providing good design practices and considerations.