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

Kim, Dongjoon; Kim, Wheejae; Kim, Wan-Chin

doi:10.1007/s12206-019-0311-4

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…Capacitors are passive electronic components found in various shapes and using different materials [ 1 ]. Numerous ceramic capacitors, especially multilayer ceramic capacitors (MLCC), are used on a modern printed circuit board (PCB).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the nonlinear phenomenon of the electrostriction also makes a second harmonic frequency vibration of the applied voltage [ 13 ]. In recent years, the thickness of the hundreds of dielectric layers present in an MLCC has decreased to achieve a large capacitance in a small package size [ 1 ]. Therefore, both properties must be taken into consideration, as the vibration generated by the piezoelectric effect is proportional to the electric field, and the vibration generated by the electrostriction is proportional to the square of the electric field [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…The resonance frequency of the MLCC vibration is in the range of MHz, therefore we should not be able to hear anything. However, as the MLCCs are surface-mount devices (SMD), the induced vibration is transferred to the PCB via solder joint [ 1 , 18 ]. When an AC voltage is applied to the MLCC, the dielectric material expands in the direction of the electric field and contracts in the direction perpendicular to the electric field, causing the deformation of the board, as shown in Figure 2 [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Covaci

Gontean

2022

Sensors

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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.

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Section: Introductionmentioning

confidence: 99%