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Reliability and IQC of quartz crystals

Posted: 29 Jun 1999 ?? ?Print Version ?Bookmark and Share

Keywords:quartz crystal? crystal tester? piezo-electric crystal? crystal dld? sleeping crystals?

/ARTICLES/1999JUN/1999JUN29_MAT_TAC.PDF

111IIC-Taipei ? Conference Proceedings PPTC Materials for Protecting Li-Ion & NiMH Battery Packs Abstract Products powered by Li-Ion batteries are now designed and used globally, exposing a whole new segment of engineers and con- sumers to the benefits and design considerations of Li-Ion tech- nology. Key factors for success are a continued drive for higher performance energy systems with increased reliability while reducing total product cost. Battery packs based on Li-Ion chemistry require significant charge and discharge protection to ensure their reliable and safe operation. This paper illustrates the unique benefits of using the new generation of PPTC devices based on a new low-tem- perature material family (VTP) for protecting against the fail- Frank Owen Raychem Corporation ure of other primary protective circuits and the use of inappro- priate or faulty charger equipment. Resettable devices made with VTP material uniquely allow charging current to be inter- rupted at the desired low temperatures for protecting Li-Ion cells, while permitting cell discharge within the normal operating tem- perature range. Similar benefits are gained by usingVTP-based devices in NiMH packs. Note: Only the abstract and foils appear here. The company did not submit the final paper to us on time for inclusion in the IIC-Taipei Conference Proceedings book. The speaker will give you a copy of the final paper during presentation itself.




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