• Title/Summary/Keyword: Aluminum capacitors

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The Comparison Analysis for Foreign and Domestic Slim Capacitors (국내외 제조업체 슬림커패시터의 비교분석)

  • Lim, Chang-Keun;Kim, Jong-Min;Kim, Kang-Dong;Park, Jung-Won
    • Journal of Applied Reliability
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    • v.12 no.1
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    • pp.25-33
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    • 2012
  • As to display products are made slim, the diameter of aluminum electrolytic capacitor is smaller and the length is longer to be fitted in. These small diameter and long length are pointed as the disadvantageous design factors of the capacitor's life cycle. So, the most electronic makers want to use proven capacitors (or well-known) to secure reliability of the electric products. In this study, we carried out the comparison analysis with two domestic capacitors and one foreign made capacitor. We designated separators, rubber breather and debris as the main factors that effect on the lifetime of capacitors. From the comparison results, we suggested the improvement points of the aluminum electrolytic capacitor.

Preparation of Conduction Polymer for Solid Type Aluminum Electrolytic Capacitor (알미늄 고체 전해 커패시터용 도전성 고분자막의 제조)

  • 양성현;유광균;이기서
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.3
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    • pp.528-531
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    • 1994
  • Digitalization in electronic system is required the capacitor which have a large capacitance with small size, low impedance at high frequency, and high reliability. The fabrication and its properties of aluminum solid electrolytic capacitor are investigated. Employing conduction polymer film such as, polypyrrole as solid electroylte, solid type aluminum electrolytic capacitors were made. The surface of insulationg oxide is covered with conducting polymer layer prepared by chemical oxidative polymerization. Thereafter this conducting layer is covered with conducting polymer prepared by electrochemical polymerization. The dielectric properties of these capacitors were also measured and discussed. Regarding on frequency characteristics of the trial made capacitor, impedance and ESR at high frequency is lower than those of the stacked type film capacitor. It is alo confirmed that temperature coefficient of capacitance and dissipation factor of the capacitor are lower than those of film capacitor and liquid type aluminum electrolytic capacitor.

An Experimental Study on Accelerated Life Testing for Aluminum Electrolytic Capacitors (알루미늄전해콘덴서의 가속수명시험에 관한 실험연구)

  • Kim, Heung-Jin;Cheon, Ho-Sung;Kim, Seong-Deuk;Park, Young-Taek;Jin, Hong-Gee;Park, Chan-Woong
    • Journal of Korean Society for Quality Management
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    • v.23 no.4
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    • pp.128-147
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    • 1995
  • An accelerated life testing(ALT) for aluminum electrolytic capacitors is conducted and analyzed. A testing equipment, which consists of part fixtures, relay board, controller, video bridge and microcomputer, is made for the ALT. Load factors are temperature with four levels and voltage with three levels. Base on 'optimized 4:2:1 plan', 2,000 electrolytic capacitors are allocated at 12 experimental conditions(; 4 levels of temperature ${\times}3$ levels of voltage), and the ALT is conducted. From the experimental results, an acceleration model is derived and acceleration factors are estimated. A discussion on the experimental results is included.

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Fault Diagnosis of DC Link Electrolytic Capacitors in Inverter (인버터의 직류단 전해 커패시터 고장 진단)

  • Yang, Jin-Kyu
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.2
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    • pp.145-152
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    • 2013
  • Electrolytic capacitors used for smoothing DC link voltage is one of the major root causes of fault in power electronic system. The aging of aluminum electrolytic capacitors is expressed by the increase of their equivalent series resistance (ESR) and the reduction of their capacitance. Thus, the proposed technique in this paper is to measure capacitance, by comparing energy loss of DC link capacitors with stator resistor in electric machine. Condition of DC link capacitors can be estimated from the capacitance decrease rate between initial and aged capacitors. The results show that the proposed technique provides an easy, widely applicable and simple low cost solution for detecting dc link capacitor degradation.

Development of Accelerated Life Tests for Solid Aluminum Electrolyte Capacitor Made by Domestic Manufacturing Company and Comparison of Characteristics between Domestic Products and Foreign Advanced Products (국산 고체 알루미늄 전해 커패시터의 가속수명시험 개발 및 국외 선진업체 제품과의 특성 비교)

  • 박정원;이중휘
    • Journal of Applied Reliability
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    • v.2 no.1
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    • pp.1-14
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    • 2002
  • High temperature operating test, temperature humidity test and temperature cycling were performed at various test levels for solid aluminum electrolyte capacitors made by domestic manufacturing company and foreign advanced manufacturing company. It was found that main failure mode of solid aluminum electrolyte capacitors was the decrease of their capacitances. The decrease of their capacitances has the same pattern in these tests. Test result for comparison of characteristics between domestic products and foreign advanced products shows that domestic products have the shorter lifetime and their capacitances decrease more rapidly in high temperature operating test and temperature humidity test. Also in these tests, accelerated tests for high temperature operating test and temperature humidity test were developed.

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Capacitor Failure Detection Technique for Microgrid Power Converter (마이크로그리드 전력변환장치용 커패시터 고장 검출 기법)

  • Woo-Hyun Lee;Gyang-Cheol Song;Jun-Jae An;Seong-Mi Park;Sung-Jun Park
    • Journal of the Korean Society of Industry Convergence
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    • v.26 no.6_2
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    • pp.1117-1125
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    • 2023
  • The DC part of the DC microgrid power conversion system uses capacitors for buffers of charge and discharge energy for smoothing voltage and plays important roles such as high frequency component absorption, power balancing, and voltage ripple reduction. The capacitor uses an aluminum electrolytic capacitor, which has advantages of capacity, low price, and relatively fast charging/discharging characteristics. Aluminum electrolytic capacitors(AEC) have previous advantages, but over time, the capacity of the capacitors decreases due to deterioration and an increase in internal temperature, resulting in a decrease in use efficiency or an accident such as steam extraction due to electrolyte evaporation. It is necessary to take measures to prevent accidents because the failure diagnosis and detection of such capacitors are a very important part of the long-term operation, safety of use, and reliability of the power conversion system because the failure of the capacitor leads to not only a single problem but also a short circuit accident of the power conversion system.

Etch Pit Growth on Aluminum of Cathode Film for Aluminum Electrolytic Capacitor (알루미늄 전해 커패시터용 음극박의 에칭 피트 성장)

  • Kim, Hong-Il;Choi, Ho-Gil;Kim, Sung-Han;Kim, Young-Sam;Shin, Jin-Sik;Park, Soo-Gil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.407-408
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    • 2005
  • High surface area electrodes for aluminum electrolytic capacitors are produced by AC electrochemical processes. Optimization of crystallographic etch pit growth on aluminium during AC etching of cathode film for aluminium as electrolytic capacitor has been established. In this work, we present the observations of pit distributions by galvanostatic measurements. The effects of electrolyte concentration, current density, frequency, various pre-treatments and etching time have been studied. The specimen was pretreated in 0.5M NaOH and 1M HCl at $40\sim60^{\circ}C$, and transferred into a cell containing 1M HCl, then various mol $H_2SO_4$ etchant was added. Pit size distributions were determined with scanning electron microscopy (SEM).

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Life Estimation of Electrolytic Capacitors in Inverters (인버터용 전해커페시터의 수명 추정)

  • Lee, Dong-Choon
    • Proceedings of the KIEE Conference
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    • 2000.11a
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    • pp.243-245
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    • 2000
  • In general, aluminum electrolytic capacitors are used in the DC link of PWM inverters fur ac motor drives. The capacitor usually has the shortest lifetime in the system and then determines the lifetime of the inverter system. In this paper, a method of capacitor lifetime estimation is proposed by using an ESR(equivalent series resistance) model and a heat transfer model of capacitor, from which internal operating temperature is estimated. Then, the lifetime is predicted by Arrhenius's equation. A practical example is presented.

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Preparation and Properties of Y2O3-Doped ZrO2 Films on Etched Al Foil by Sol-Gel Process

  • Chen, Fei;Park, Sang-Shik
    • Korean Journal of Materials Research
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    • v.25 no.2
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    • pp.107-112
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    • 2015
  • The oxide films formed on etched aluminum foils play an important role as dielectric layers in aluminum electrolytic capacitors. $Y_2O_3$-doped $ZrO_2$ (YZ) films were coated on the etched aluminum foils by sol-gel dip coating, and the electrical properties of YZ-coated Al foils were characterized. YZ films annealed at $450^{\circ}C$ were crystallized into a cubic phase, and as the $Y_2O_3$ doping content increased, the unit cell of $ZrO_2$ expanded and the grain size decreased. The etch pits of Al foils were filled by YZ sol when it dried at atmospheric pressure after repeating for several times, but this step could essentially be avoided when being dried in a vacuum. YZ-coated foils indicated that the specific capacitance and dissipation factor were $2-2.5{\mu}F/cm^2$ and 2-4 at 1 kHz, respectively, and the leakage current and withstanding voltage of films approximately 200 nm thick were $5{\times}10^{-4}A$ at 21 V and 22 V, respectively. After being anodized at 500 V, the foils exhibited a specific capacitance and dissipation factor of $0.6-0.7{\mu}F/cm^2$ and 0.1-0.2, respectively, at 1 kHz, while the leakage current and withstanding voltage were $2{\times}10^{-4}-3{\times}10^{-5}A$ at 400 V and 420-450 V, respectively. This suggests that YZ film is a promising dielectric that can be used in high voltage Al electrolytic capacitors.

Effects of the Additives on Etching Characteristics of Aluminum Foil (첨가제에 의한 알루미늄박의 에칭특성변화)

  • Kim, Seong-Gap;Shin, Dong-Cheol;Jang, Jae-Myeong;Lee, Jong-Ho;Oh, Han-Jun;Chi, Chung-Su
    • Korean Journal of Materials Research
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    • v.11 no.1
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    • pp.48-54
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    • 2001
  • The effects of additives in the HCI etching solution on etching behaviors of aluminum foil as dielectric film for electrolytic capacitors were investigated. The etch pits formed in 1M hydrochloric acid containing ethylene glycol as an additive contain more fine and homogeneous etch tunnels compared to those in 1 M hydrochloric acid only, which led to the increase in the effective internal surface area of aluminum foil. After anodizing of aluminum foil etched in etching solutions, the LCR meter results have shown that the capacitance of dielectric film etched in hydrochloric acid with ethylene glycol was increased remarkably compared to that etched in hydrochloric acid only.

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