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Multilayer varistor having a field-optimized microstructure

A varistor and sub-layer technology, applied in varistors, varistor cores, resistors, etc., can solve the problems of varistor stability reduction and achieve the effect of avoiding uneven temperature rise

Active Publication Date: 2021-02-19
EPCOS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the grain structure of the ceramic body, it is not possible to effectively avoid locally excessively high current densities, which lead to reduced stability of the varistor

Method used

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  • Multilayer varistor having a field-optimized microstructure
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  • Multilayer varistor having a field-optimized microstructure

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Embodiment Construction

[0036] figure 1 An embodiment of a multilayer varistor comprising a ceramic body is shown in a schematic cross-section, wherein the active region 3 between the differently contacted first internal electrodes 1 and second internal electrodes 2 comprises a second An area A other than the active area 4 includes a second area B. Here, the first region A has an average grain size of 3 µm. Due to the reduced average grain size in the active area, higher threshold voltages can be achieved for a given volume of the active area. It is also possible to reduce the volume of the active region under a given threshold voltage, thereby realizing further miniaturization of the multilayer varistor. For a given threshold voltage and a given active volume, it is also possible to increase the number of internal electrodes in the active volume, thereby leading to a better conduction of the current that occurs. As a result, the current robustness of the multilayer varistor is improved.

[0037...

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Abstract

The invention relates to a multilayer varistor having a ceramic body that consists of a varistor material, said ceramic body comprising a plurality of inner electrodes and first regions (A) and secondregions (B) and the varistor material in the first regions (A) having a first average particle diameter DA and in the second regions (B) a second average particle diameter DB, wherein DA<DB.

Description

technical field [0001] The invention relates to a multilayer varistor comprising a ceramic body. Background technique [0002] Multilayer varistors based on ZnO ceramics are widely used components for overvoltage protection. With increasing demands in the field of miniaturization and performance enhancement of such components, there is a constant need to improve the varistor characteristics. In addition, the requirements for the stability of such components are constantly increasing, so that, for example, the electrical insulation strength, pulse resistance and contact and clamping properties of multilayer varistors need to be improved. [0003] In typical electrothermal-mechanical overload situations during current surges, such as in the event of a lightning strike or electrostatic discharge, an inhomogeneous distribution of the current density along the inner electrodes of the multilayer varistor occurs, which leads to the Uneven heating of multilayer varistors. As a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/102H01C7/112H01C7/18
CPCH01C7/112H01C7/102H01C7/18H01C1/16H01C7/10
Inventor T·法伊希廷格M·霍夫施泰特H·格林比希勒
Owner EPCOS AG