Development of Film-on-Foil Ceramic Dielectrics for Embedded Capacitors for Power Inverters in Electric Drive Vehicles

概要

論文の詳細を見る
Advanced power inverters for electric drive vehicles require capacitors that operate under high voltage at under-hood temperatures and have minimal footprint. This need can be realized by embedding ceramics with high dielectric constant within a printed wire board (PWB). The ``film-on-foil'' approach, where the high-dielectric-constant ceramic is first deposited on base-metal foil, is a promising method for embedding the capacitors within a PWB. We have deposited lead lanthanum zirconium titanate (PLZT) on nickel foils and characterized the samples in the temperature range between -50 and 250 °C. The measured dielectric constants varied with temperature: from {\approx}700 at -50 °C to {\approx}2200 at 250 °C. The dielectric loss remained fairly constant at {\approx}0.05{\mbox{--}}0.08. At 300 V bias, a dielectric constant of {\approx}110 and dielectric loss of {\approx}0.004 were measured. Hysteresis loop analysis showed an energy density of {\approx}85 J/cm<sup>3</sup>. The fabrication procedures and dielectric properties of the PLZT film-on-foils will be described in this paper.
2013-05-25