Shelf-Life Evaluation of Aluminum Electrolytic Capacitors

Greason, W.D.; Critchley, J. K.

doi:10.1109/tchmt.1986.1136645

Cited by 23 publications

(4 citation statements)

References 9 publications

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“…Here, ESR is equivalent serial resistance and C is the nominal capacity of the electrolytic capacitor. ESR value is calculated using Dissipation Factor (DF) [6]. DF is also called tan (j , and means the loss angle of Ra nd C at impedance plane.…”

Section: A Characteristics Of Energy Storage Devicesmentioning

confidence: 99%

Comparison of energy storage devices for diagnostic X-Ray Generator

Seo

Hong

Kim

2012

Proceedings of the 7th International Power Electronics and Motion Control Conference

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High voltage power is needed by diverse application fields such as high precISIon medical equipment, and development of an X-ray generator equipped with large capacity power is accordingly required. Commercial AC power based X ray generator has a disadvantage of having limitation in the location and of being sensitive to the power characteristics, the necessity for an independent power type X-ray generator is increasing recently. For this reason, development of an energy storage device based stand-alone type X-ray generator is required. This paper compared characteristics of energy storage devices, and composed equivalent models of each energy storage devices, and analyzed characteristics of available energy as a function of output voltage and power. An energy storage device based 32 [kW] class X-ray generator was constructed, and the output characteristics of diagnostic X-ray generators with each energy storage devices were compared through simulations and experiments.

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Section: A Characteristics Of Energy Storage Devicesmentioning

confidence: 99%

Comparison of energy storage devices for diagnostic X-Ray Generator

Seo

Hong

Kim

2012

Proceedings of the 7th International Power Electronics and Motion Control Conference

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“…In a first moment the signals are sampled during one switching cycle, followed by the evaluation of the average values of both state variables, considering all the samples for the single switching cycle and by means of the numerical solution below, which intends for the trapezoidal integration: (5) where x represents any of the state variables, N=T sw /T samp is the number of samples to be used in the integration of one switching cycle, T sw is the period of the switching frequency, and T samp is the period of the sampling frequency.…”

Section: Novel Proposed Techniquementioning

confidence: 99%

“…The classical example of fault diagnosis in DC/DC converters regards the diagnosis of electrolytic capacitors, where the diagnosis is done through the knowledge of the ESR, which increases accordingly to the aging of the capacitor [2][3][4][5]. Another fact, but less exploited, is that not only the ESR increases ( Fig.…”

Section: Introductionmentioning

confidence: 99%

An Online Technique for Estimating the Parameters of Passive Components in Non-Isolated DC/DC Converters

Buiatti

Amaral

Cardoso

2007

2007 IEEE International Symposium on Industrial Electronics

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In this paper, a novel online technique used for estimating the parameters of passive components in non-isolated DC/DC converters is presented. The technique is implemented for the Boost and Buck-Boost converters, operating both in Continuous Current Mode (CCM) and Discontinuous Current Mode (DCM). The technique is based on the sampling of the MOSFET gate signal, inductor current and load voltage, which is followed by the processing of the acquired data through different ways such as the least mean squares algorithm. The knowledge of these passive components parameters may be used in the fault diagnosis of such converters. Results obtained from simulations are presented, followed by experimental results in which the inductance, capacitance, load resistor and ESR of the capacitor are estimated, in order to validate the proposed technique.

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“…The conventional way to deal with this variation is to employ electrolytic capacitors that buffer the difference between the AC input and the DC output power in the conversion unit. Unfortunately, the lifetime of an electrolytic capacitor is about 5,000 hours [5]- [6]. This causes the operating lifetime of an LED lighting system to be significantly shortened.…”

Section: Introductionmentioning

confidence: 99%

Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach

Wong

Lai

Loo

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally.

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Shelf-Life Evaluation of Aluminum Electrolytic Capacitors

Cited by 23 publications

References 9 publications

Comparison of energy storage devices for diagnostic X-Ray Generator

Comparison of energy storage devices for diagnostic X-Ray Generator

An Online Technique for Estimating the Parameters of Passive Components in Non-Isolated DC/DC Converters

Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach

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