Vibration reduction of MLCC considering piezoelectric and electrostriction effect

Kim, Dongjoon; Ko, Byung-Han; Jeong, Sanggeuk; Park, No−Cheol; Park, Young−Pil

doi:10.1109/isaf.2015.7172701

Cited by 9 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, in the equation of mechanical strain Equation (1), only the z -direction is taken into consideration [ 8 ].

where s z is the mechanical strain, d 33 is the piezoelectric coefficient, M 33 is the electrostrictive coefficient, and E z is the applied electric field on the z -direction (the electric field applied on the x and y directions, E x and E y , respectively, can be neglected) [ 1 , 8 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…In general, the electric signal applied on MLCC has DC and AC components, as shown in Equation (2). In this case, the mechanical strain equation is expressed using Equations (3) and (4) [ 1 , 8 , 13 , 14 ].

…”

Section: Introductionmentioning

confidence: 99%

“…When the DC component is zero (the electrical signal contains only the AC component), the vibration is caused only by piezoelectricity. As the vibration at the fundamental frequency is influenced both by piezoelectricity and electrostriction, the nonlinear characteristic of the MLCC is present only when the DC electric field is not zero [ 8 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

“Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review

Covaci

Gontean

2022

Sensors

View full text Add to dashboard Cite

Multilayer Ceramic Capacitors (MLCC) have a major role in modern electronic devices due to their small price and size, large range of capacitance, small ESL and ESR, and good frequency response. Unfortunately, the main dielectric material used for MLCCs, Barium Titanate, makes the capacitors vibrate due to the piezoelectric and electrostrictive effects. This vibration is transferred to the PCB, making it resonate in the audible range of 20 Hz–20 kHz, and in this way the singing capacitors phenomenon occurs. This phenomenon is usually measured with a microphone, to measure the sound pressure level, or with a Laser Doppler Vibrometer (LDV), to measure the vibration. Besides this, other methods are mentioned in the literature, for example, the optical fiber and the active excitation method. There are several solutions to attenuate or even eliminate the acoustic noise caused by MLCC. Specially designed capacitors for low acoustic levels and different layout geometries are only two options found in the literature. To prevent the singing capacitor phenomenon, different simulations can be performed, the harmonic analysis being the most popular technique. This paper is an up-to-date review of the acoustic noise caused by MLCCs in electronic devices, containing measurements methodologies, solutions, and simulation methods.

show abstract

“…Therefore, in the equation of mechanical strain Equation (1), only the z -direction is taken into consideration [ 8 ].

Section: Introductionmentioning

confidence: 99%

…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

“Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review

Covaci

Gontean

2022

Sensors

View full text Add to dashboard Cite

show abstract

“…Their results indicated that the repoling treatment improves the sensitivity and variance and that the piezoelectric properties of MLCCs could be readily controlled by a simple poling treatment. Perhaps most pertinent to the direct control of MLCC vibration is the work of Kim et al, in which the possibility of reducing MLCC‐induced vibration and acoustic noise was demonstrated with a repoling treatment of MLCCs …”

Section: Introductionmentioning

confidence: 99%

“…In this study, expanding upon our previous work, we developed a systematic repoling strategy to control the electromechanical properties and thereby to reduce MLCC vibration. Here, unlike the work of Lin et al, the repoling protocol was designed with the specific knowledge of the combined effects of piezoelectricity and electrostriction in ceramic layers.…”

Section: Introductionmentioning

confidence: 99%

Control of electromechanical properties of multilayer ceramic capacitors for vibration reduction

Ohm

Kim

et al. 2017

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

A multilayer ceramic capacitor (MLCC) contains layers of ceramics as the dielectric materials. It has been known that Class 2 MLCCs, made of ferroelectric ceramics such as barium titanate, tend to suffer from electromechanical coupling hence vibration, which leads to the generation of acoustic humming noise, a source of annoyance in many modern electronic devices. In this article, a repoling method to control the electromechanical properties and the resulting vibration of MLCCs is presented. The repoling protocol hinges on the understanding that two independent mechanisms are responsible for the electromechanical coupling in MLCCs: piezoelectricity and electrostriction of the ceramic layers. The vibration due to piezoelectricity is linearly proportional to the input voltage, whereas the vibration due to electrostriction shows a quadratic dependence. Given the DC bias and the AC input voltage under normal operating conditions, the vibration is composed of the fundamental component at the frequency of the AC input and the second harmonic component spawned by the quadratic nonlinearity of electrostriction. It is demonstrated that by engineering the coefficients of piezoelectricity and electrostriction of the ceramic layers through a carefully designed repoling treatment, vibration reduction can be achieved for both the fundamental and second harmonic components. Especially, the fundamental component of vibration can be reduced significantly, as the piezoelectric effect is made to offset the electrostrictive effect. K E Y W O R D S electromechanical properties, electrostriction, multilayer capacitor, piezoelectric materials/properties

show abstract

Dynamic analysis of multilayer ceramic capacitor for vibration reduction of printed circuit board

Kim

2019

J Mech Sci Technol

View full text Add to dashboard Cite

Vibration reduction of MLCC considering piezoelectric and electrostriction effect

Cited by 9 publications

References 6 publications

“Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review

“Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review

Control of electromechanical properties of multilayer ceramic capacitors for vibration reduction

Dynamic analysis of multilayer ceramic capacitor for vibration reduction of printed circuit board

Contact Info

Product

Resources

About