Modifying Quasi Z-Source Network for an Innovative Extendable Switched-Capacitor Boost Multilevel Inverter Topology
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Switched capacitor
Tantalum capacitor
Film capacitor
Polymer capacitor
Filter capacitor
Equivalent series resistance
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The U. S. Army Research Lab (ARL) is investigating the capabilities of high energy density capacitors at narrow pulse widths from two different manufacturers for high current pulsed power applications. Breakthroughs in this technology would allow smaller capacitor storage to be possible while retaining the same capabilities. The discharge pulse widths of the test shots were between thirteen and fourteen microseconds. These pulse widths were taken from the full wave half maximum pulse width (FWHM). Both capacitors are rated for 12.5 kJ of energy and are 250 μF but have different volumes. The General Atomics Capacitors (GA-ESI 38982, 38994) have a total energy density of 1.3 J/cc while the manufacturer B's capacitor has an energy density of 0.64 J/cc. Both General Atomics' and manufacturer B's capacitors are polypropylene metallized film capacitors. While energy density is a major concern for our tests; attributes such as peak current, rise time, and high voltage lifetime were other factors to be considered. ARL is collaborating directly with General Atomics to help provide input and data in order to improve all properties of their capacitors.
Filter capacitor
Energy density
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Capacitor is one of the elements most application.It has been proved that choosing and using capacitors properly can achieve many functions In the circuit design.choose or use capacitors improperly,the capacitors and the relevant units with capacitors will not be able to suppress effectively.Based on the principle of circuit design and the characteristics of different kind of capacitors,considering the some new achievements of relevant research,Discussion of the application techniques of capacitors in circuit are designed in this paper.This is valuable to guide the circuit design.
Filter capacitor
Film capacitor
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In this paper, the authors use an analytical model to calculate the losses in the metallized polypropylene film capacitors. The model is validated experimentally for capacitors having the same capacitance but different geometry. For each group of capacitors, a temperature distribution in the roll is assumed with the aim of optimizing its thermal performance. It appears that the heating of a long capacitor is higher than that of an equivalent flat capacitor subjected to the same electric stresses.
Film capacitor
Polypropylene
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In this paper we present the novel method of classification of through hole capacitors into two categories reusable and defective capacitors. Classification of three types of capacitors viz. color coded capacitors, ceramic disc capacitors and electrolyte capacitors has been achieved by applying profile based technique. Proposed method performs well under different background, different scaling, and illumination levels. Proposed method is fast as compared with template matching.
Film capacitor
Filter capacitor
Ceramic capacitor
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The selection of materials and structure of film capacitors for high temperature application are discussed. The key theory and techniques for the film capacitors are presented, and the dielectric properties of PET, PP, PC and PPS capacitors are analyzed.
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Filter capacitor
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The high-frequency performance of capacitors is related to their geometry and material properties. By considering multilayer capacitors as distributed electrical systems, the tools of ICONSIM are applied to study resonant frequencies, equivalent circuits of capacitors, and the influence of ground planes, test fixtures, and type of connection topology. The methods established are applied to well-documented capacitors described in the literature and good agreement between experimental results and analyses is obtained.< >
Film capacitor
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A simple technique is proposed to adjust coefficients of transfer functions in switched-capacitor circuits. Transfer-function-coefficients are defined by capacitor-values considering full-charge transfer among capacitors. The proposed tuning technique in this paper is based on adjusting the amount of charge transferred from one capacitor to next capacitor. By all means, the net charge transferred in switchedcapacitor circuits will effectively modify transfer function of a particular block without modifying individual capacitor values.
Switched capacitor
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In this paper, The development of the topologies in multilevel converters is summarized and the relationship between the different topologies is analyzed. A conclusion that all existing topologies can be deduced from the generalized topology is obtained. Then two novel topologies are proposed. The operating concept and control strategy of the novel topologies are studied. Simulation results show the validity and feasibility of the novel topologies.
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Vacuum capacitors are particularly suitable for high-frequency high-voltage operation in airborne radio equipment. Capacitors developed to fulfil requirements of a specific nature revealed a number of interesting effects which are explained qualitatively, and which have considerable influence on the capacitor design. The results are of general application and tests on the capacitors developed show that their performance is very satisfactory. It is believed that, for the requirements specified, no other type of capacitor has a comparable performance.
Filter capacitor
Film capacitor
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