New Generation Capacitor Films for 150°C High Voltage AC-DC Inverter Applications

Abstract:
A new generation of capacitor films capable of operating at 150deg C was developed for high heat capacitors suited for AC-DC inverter modules using SiC or GaN MOSFETS and potentially reducing or eliminating active cooling. The films exhibit stable Dk (2.9), low Df (0.002), and breakdown voltage of about 500 V/µm over the temperature range. Capacitors made with these films pass stringent industry reliability testing having <5% capacitance change, stable insulation resistance, and low dissipation losses over 2000 hours at 150deg C under voltage. The ultra-thin 3 & 5 µm films, made from a high-heat engineering thermoplastic material, are compatible with existing downstream metallization, slitting and capacitor building technologies.