TDK has revealed EPCOS CeraLink, an innovative DC link capacitor for frequency converters. It is based on a PLZT ceramic material (lead lanthanum zirconate titanate) and covers a capacitance range from 1 μF to 100 μF at a rated voltage of 400 V d.c. Another type has a rated voltage of 800 V d.c. and a capacitance of 5 μF.
CeraLink technology offers many benefits in the stabilisation and filtering of DC link circuits of power converters, especially compared to conventional capacitor technologies. Thanks to a low ESL value of less than 4 nH as well as a low ESR of less than 4 mΩ, the new capacitors are ideally suited for applications with high switching frequencies and rapid rise times. This includes converters for industrial and automotive electronics that operate with new fast-switching MOSFETs or IGBTs.
The capacitors can be produced with several commonly available terminal configurations, including low-profile, SMD, solder pin and press-fit busbar types. Designs that can be integrated in semiconductor power modules are also possible.
CeraLink is designed for temperatures between -40°C and +125°C (or up to +150°C for short periods) thus making it suitable for SiC-based power modules as well. Compared to conventional MLCCs, CeraLink features a positive DC bias. Another benefit of the new capacitor is the very compact dimensions: depending on the type, they range between 6,84 x 7,85 x 2,65 mm and 52,5 x 30,5 x 10,5 mm³.
As production of these new components is still ramping up, please contact a distributor to confirm availability.
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