Nano-enabled metal oxide varistors

Daniel Qi Tan, Karim Younsi, Yingneng Zhou, Patricia Irwin, Yang Cao

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Zinc oxide based metal oxide varistors (MOV) are widely used electrical surge protection components. The design of modern high power, high-density electronic systems necessitate the need for smaller footprint, higher current density and higher nonlinearity MOVs. Such requirements can no longer be satisfied by commercially available MOVs due to their limited voltage capability, high leakage current and mechanical cracking related reliability issues, most of which are associated with the presence of defects and coarse granularity and lack of uniformity in their microstructures. New formulations and processes have been developed to overcome such limitations. This work has developed nano-enabled MOV compositions that can be sintered at relatively lower temperatures than typical commercial MOVs, but with largely improved I-V characteristics due to refined and uniform sub-micron structures. These nano-enabled MOVs show not only high breakdown strength (1.5 kV/mm) with low leakage current, but also a large nonlinear alpha coefficient > 50 at high fields, a measure of the speed of the transition from the insulating to conducting state and the effectiveness of over-voltage protection. A > 10x increase in breakdown strength compared to commercial MOVs, along with much higher nonlinearity, will enable MOV miniaturization, high voltage surge protection, and open up new areas of application.

Original languageEnglish
Article number5211836
Pages (from-to)934-939
Number of pages6
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume16
Issue number4
DOIs
StatePublished - Aug 2009
Externally publishedYes

Keywords

  • Metal oxide varistor, ZnO, Nano, breakdown voltage, sintering, surge protection, grain boundary, I-V characteristics.

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