Metallized Film Capacitors Keep Pace With High-Voltage IGBT Modules

PublishTime：2021-07-21

●IGBT modules now achieve blocking voltages of 6kV or higher, so dc capacitors of 1mF to 100 mF at 3.3kV are used for the associated dc bus. Different capacitor technologies have been used for these applications, including aluminum electrolytic, oil or gas impregnated metallized film, or metallized paper. Ideally, a single capacitor should be able to operate continuously with an extended life of over 100,000 hours at these dc bus volt-ages.Before 1990, high voltage dc filter capacitors used metallized paper impregnated with wax or multiple computer grade aluminum electrolytics in series. Metallized paper,although self healing, allowed gas to generate. Aluminum electrolytics had the problem of not being able to handle certain surge conditions because too high a voltage caused a breakdown in its oxide, resulting in an internal short cir-cuts[2].Since 1990, metallized paper was replaced with polypropylene film and the metallization was not only self-healing yet allowed a way to insert an accurate protection system within the capacitor. This latest technology with patterned electrodes allows control of the energy involved in an internal breakdown that becomes a beneficial self-healing[3]. These advancements have allowed a 50% reduction in capacitor size, with about half of this volumetric change in the last 23 years.Performance of the new 3300Vdc dielectric system is exhibited by its aging characteristics under normal operating conditions and the safe failure mode of capacitance reduction caused by severe duty or end of life. This performance is demonstrated by applications where it is generally considered that a 2% reduction in capacitance from the original measured value is what defines end of life for at least 20 years at or near continuous duty.

Brand of Product：	CDE
Part#：
Product Category：	Metallized Film Capacitors 、 High-Voltage IGBT Modules More
Application：	More
Data Type：	Technical Documentation More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
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Language：	English Chinese Chinese and English Japanese
Date of Creation：	2021/07/05
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Data Size：	231 KB

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