Acoustic noise and vibration analysis of solid state drive induced by multi-layer ceramic capacitors

Kim, Hyun Woo; Kim, Dongjoon; Park, No Cheol; Park, Young Pil

doi:10.1016/j.microrel.2018.01.021

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…For the vibration inside a capacitor, numerical finite element models are usually employed in the frequency domain. Electric forces derived from the voltage on a capacitor, as shown in Equation ( 1), were input into a finite element model to calculate the corresponding mechanical vibration [10]. The calculation was conducted in the frequency domain.…”

Section: Vibration Model Of a Power Capacitor Corementioning

confidence: 99%

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Vibration Model of a Power Capacitor Core under Various Harmonic Electrical Excitations

Lei

Zuo

et al. 2022

Energies

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Power capacitors are widely used in power transmission systems. During their operation, an electric force acting on the electrodes of the power capacitors actuates mechanical vibrations and radiates an audible noise. Considering a power capacitor as a general system, the frequency response with the electric force as the input and mechanical vibration as the output have been measured by engineers in recent years and used to evaluate the acoustic and mechanical features of products. Accidentally, it was found that the frequency of the capacitor vibration was not consistent with its excitation due to electro-mechanical coupling. This electro-mechanical coupling had not been considered in previous vibration models of power capacitors. Therefore, a new vibration model of power capacitors was built up in this paper and a so-called multi-frequency vibration characteristic was revealed. A theoretical analysis showed that the electric force and mechanical vibration of the power capacitors were coupled, which resulted in the multi-frequency vibration. The vibration frequency response was measured and the result was consistent with the vibration model proposed in this paper. Once the frequency of the electric force was near half the natural frequency of the power capacitor, a predominant multi-frequency vibration was triggered and the power capacitor was in a superharmonic resonance.

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Section: Vibration Model Of a Power Capacitor Corementioning

confidence: 99%

“…Substituting Equation (10) into Equation (12), the equation for the first-order corrective solution ξ 1 (x,t) was obtained as:…”

Section: Theoretical Analysis Of the Frequency Response Of The Capaci...mentioning

confidence: 99%

Vibration Model of a Power Capacitor Core under Various Harmonic Electrical Excitations

Lei

Zuo

et al. 2022

Energies

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“…All of these MLCCs advantages are due to the high-level permittivity dielectric material, Barium Titanate (BaTiO 3 ), they are made of [ 10 , 11 , 12 ]. Ironically, the two main electro-mechanical properties of the BaTiO 3 cause one of the newest problems in electronic devices: the singing capacitors phenomenon [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“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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Analysis of Influence of Multilayer Ceramic Capacitor Mounting Method on Circuit Board Vibration

Kim

Yoon

et al. 2021

Vibration Engineering for a Sustainable Future

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Acoustic noise and vibration analysis of solid state drive induced by multi-layer ceramic capacitors

Cited by 10 publications

References 10 publications

Vibration Model of a Power Capacitor Core under Various Harmonic Electrical Excitations

Vibration Model of a Power Capacitor Core under Various Harmonic Electrical Excitations

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

Analysis of Influence of Multilayer Ceramic Capacitor Mounting Method on Circuit Board Vibration

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