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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Electrolytic capacitors"”.
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Condition Monitoring of Electrolytic Capacitors for Power Electronics Applications
… to advance the field of condition monitoring of electrolytic capacitors used in power electronics circuits. The construction process of an electrolytic capacitor is presented. Descriptions of various kinds of faults that can occur in an electrolytic capacitor are discussed. The methods available …
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Determination of the Shelf Life of Aluminum Electrolytic Capacitors.
The aluminum electrolytic capacitor is used extensively in the electric utility industry. A factor limiting the storage of spare capacitors is the integrity of the aluminum oxide dielectric, which over time breaks down contributing to a shelf life currently estimated at one nuclear power electric …
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OXIDATION AND REDUCTION SYNTHESIS OF SURFACE ENHANCED TITANIUM-BASED ELECTRODES FOR ELECTROLYTIC CAPACITORS
Capacitors are important for use in electrical energy management in low and high-frequency applications. Electrolytic capacitors with high energy density have the potential to be used for efficient energy management in electrical power supplies and for supplying power pulses, for example in spot …
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A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR
Electrolytic capacitors used in photovoltaic (PV) power conditioning units (PCU) for power decoupling purposes are less reliable in nature. Film capacitors can be adopted instead of electrolytic capacitors if the energy storage requirement of the PCU is reduced, since they offer better reliability …
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Stacked switched capacitor energy buffer architecture
Electrolytic capacitors are often used for energy buffering applications, including buffering between single-phase ac and dc. While these capacitors have high energy density compared to film and ceramic capacitors, their life is limited and their reliability is a major concern. This thesis presents …
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Characterization of Aluminum Surfaces: Sorption and Etching
… and analyze the aluminum substrate. Aluminum electrolytic capacitors are comprised of aluminum anode foil covered by an anodically grown aluminum oxide dielectric film, electrolytic paper impregnated with electrolyte, and aluminum cathode foil. Two main processes are involved in the …
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Stacked-Switched Electrolytic Capacitor-less AC/DC Power Converters
… AC/DC converters often depend on bulky electrolytic capacitors, diode bridges, and hard-switching circuits, leading to reduced reliability, increased losses, and limited power density. Additionally, the need for bidirectional energy flow—such as Vehicle-to-Grid (V2G) and Vehicle-to-Home …
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Comparison and Design of High Efficiency Microinverters for Photovoltaic Applications
… not propagate to the PV panel a large bank of electrolytic capacitors are used to buffer the ripple. There is concern that the electrolytic capacitor will degrade over time and affect the system efficiency. To get around having to use electrolytic capacitors a two stage microinverter has been …
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Bi-Directional AC-DC Converters for Electric Vehicles
… reduction due to the use of unreliable electrolytic capacitors. This thesis proposes a family of on-board Single-stage bidirectional battery chargers to handle a wide range of active and reactive power control. Single-stage power conversion is chosen due to lower component count, better …
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Synthesis and Characterization of Titanium Zirconium Based Alloys for Capacitor Use
… a ternary Ti-Zr-Be alloy as anode materials for electrolytic capacitors. Specifically, this work attempts to improve the electrical behavior by reducing leakage through anodically grown oxide film on binary alloys via microstructure modifications. It also examines creep of Ti25Zr38Be37 metallic …
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Power Converter and Control Design for High-Efficiency Electrolyte-Free Microinverters
… and improve the long-term reliability, electrolytic capacitors must be avoided in microinverters because they have been identified as an unreliable component. One solution to avoid electrolytic capacitors in microinverters is using a two-stage architecture, where the high voltage direct …
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Control of Pseudo-Sinusoidal Switched Reluctance Motor with Zero Torque Ripple and Damped Input Current Ripple
… ripple at the DC bus input requires large electrolytic capacitors for attenuation. However, electrolytic capacitors are of low reliability, which will reduce the duration of the control system. Because of these disadvantages, the acceptance of SRM by the industry, especially in servo-type …
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Comparative evaluation of dual-voltage automotive alternators
… and the appropriateness of aluminum electrolytic capacitors for automotive applications are also discussed. These analyses are used to discuss the cost and weight characteristics of dual-voltage alternators meeting the minimum performance characteristics discussed.
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Design of a miniature high-speed carbon-nanotube-enhanced ultracapacitor for electronics applications
Electrolytic capacitors, the current standard for high-value capacitors, are one of the most challenging components to miniaturize, accounting for up to 1/3 of the volume in some power devices, and are the weak link with regard to reliability, accounting for the majority of failures in consumer …
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DC Reluctance Machine — A Doubly-Salient Reluctance Machine with Controlled Electrical and Mechanical Power Ripple
… to RMs have been (1) the need for failure-prone electrolytic capacitors, (2) large torque ripple, and (3) acoustic noise. Conventionally, these drawbacks have been addressed independently either through (1) excitation control or (2) machine design, but not as a holistic system or solution. This …
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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System
… lifetime limitation of LED driver imposed by electrolytic capacitor has to be resolved. Therefore, an LED driver without electrolytic capacitor in the whole power conversion process is preferred. In this thesis, a single phase, power factor correction converter without electrolytic capacitors …
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Energy Harvesting Applications of Ionic Polymers
… is performed between the ionic polymers and capacitors. While the polymers performed well, the electrolytic capacitors are able to store more energy. However, the ionic polymers show potential as capacitors and have the possibility of improved performance as energy storage devices. Current is …
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Design and implementation of a single phase modified Z-source inverter topology for photovoltaic/grid interconnected DC charging applications
… completely thereby eliminating the need to use electrolytic capacitors in ZSI systems. The proposed APF can reduce the capacitance by 100 times. Simulation studies have been presented for the proposed topology.
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Power electronic transformers for AC-AC and AC-DC conversion with reduced number of switches
… This single-stage AC-AC converter without any electrolytic capacitors translates to higher reliability and efficiency. High-frequency transformers have finite leakage inductance, hence, any switching in the primary or secondary of the transformer requires commutation of the transformer …
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Design and Control of Charge-Pumped Reboost Converter for PV Applications
… high efficiency. The design avoids the use of electrolytic capacitors in favor of smaller ceramic capacitors and a few large film-capacitors. A simplified model is proposed which is still suitable for use in the design of high-bandwidth control loops. Testing is done with a PV source showing …
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