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Study on effective piezoelectric coefficient for finite element analysis of multi-layer ceramic capacitor | IEEE Conference Publication | IEEE Xplore

Study on effective piezoelectric coefficient for finite element analysis of multi-layer ceramic capacitor


Abstract:

Effective piezoelectric coefficient for finite element method of multi-layer ceramic capacitor was calculated in this study considering three factors; reduction ratio of ...Show More

Abstract:

Effective piezoelectric coefficient for finite element method of multi-layer ceramic capacitor was calculated in this study considering three factors; reduction ratio of the number of layer in finite element model, electrostriction, and applied DC voltage. Fundamental and second harmonic frequency of vibration response was measured when MLCC is operated under sinusoidal AC voltage and various DC voltage. Vibration measurements were separated into piezoelectric and electro-strictive vibration. Using finite element analysis, piezoelectric and electrostrictive coefficients were calculated and effective piezo-electric coefficients were also calculated.
Date of Conference: 24-27 May 2015
Date Added to IEEE Xplore: 30 July 2015
Electronic ISBN:978-1-4799-9974-3

ISSN Information:

Conference Location: Singapore

I. Introduction

Recently, vibration analysis of Multi-Layer Ceramic Capacitor (MLCC) becomes very important because it makes problems of electronic devices or in-vehicle electronic systems such as acoustic noise or malfunction. Thus, it is important to analyze and reduce the vibration of MLCC. It is caused by electro-mechanical properties of the dielectric layer which consists of . There are two main properties; piezoelectricity and electrostriction. is one of the most popular ceramic material which shows piezoelectricity. It is used to make dielectric layer because of its high permittivity. Although there is no poling treatment of MLCC, applied DC bias makes polarization of dielectric layers and increase the piezoelectric coefficient. Thus, when AC voltage applied to the MLCC, vibration occurs which is enough to excite circuit board where MLCCs are mounted. Meanwhile, electrostrictive vibration of MLCC also could not be negligible because of two reasons. First, strong electric field generated between inner electrodes makes large electrostrictive vibration which is similar with piezoelectric vibration level. Second, electrostriction makes second harmonic frequency vibration of applied AC voltage because it is nonlinear phenomenon as opposed to the piezoelectricity. Thus, both two vibration mechanism must be considered together in vibration analysis.

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References

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