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Ultracapacitors
Published in Ali Emadi, Handbook of Automotive Power Electronics and Motor Drives, 2017
Before considering the electrolytic capacitor it is worthwhile to examine the tantalum capacitor. Long used as a high-capacitance, compact, decoupling capacitor in electronic circuitry, the tantalum capacitor construction is a precursor to EDLCs. Figure 7.3 illustrates the basic construction of a tantalum capacitor. In this component the anode is constructed of tantalum powder with a tantalum wire inserted that is then pressed into a pellet. When the pellet is sintered all the individual tantalum particles become fused (i.e., interconnected) together and to the tantalum wire in a highly porous structure. The cathode electrolyte, manganese dioxide (MnO2), penetrates far into the porous channels in the tantalum particle pellet, forming a contact within this highly porous structure. Upon polarization a very thin film of tantalum oxide forms on the tantalum particle surfaces, thereby insulating them from the cathode electrolyte. This dielectric (Ta2O5) is extremely thin, on the order of nanometers, and results in a very high A/d factor in Equation 7.1. The issue with tantalum capacitors has been their high equivalent series resistance (ESR) owing to the porous web of interconnected tantalum particles.
Components (Passive)
Published in Bob Mercer, Industrial Control Wiring Guide, 2007
In electrolytic capacitors, the insulation layer is a thin oxide formed from an electrolytic liquid (or paste) when a voltage is applied. These and the tantalum capacitor have the characteristic of a high capacitance in a relatively small size.
Capacitors
Published in Adrian Waygood, An Introduction to Electrical Science, 2013
A tantalum capacitor (Figure 23.10) is a type of electrolytic capacitor which uses the metal tantalum, instead of aluminium, and is physically much smaller than an equivalent aluminium electrolytic capacitor described above.
A new Spk -based sample-size tightening sampling system for lot determination
Published in Quality Technology & Quantitative Management, 2023
Although the aluminum capacitor has a higher value of capacitance than, and a similar degree of chip formation to, those of the MLCC, the performance is easily influenced by the environment in which it is employed. The tantalum capacitor has steady direct-current (DC) biasing and capacitance, lower leakage loss of electricity, and the ability to resist the pressure of a warped substrate. However, it is more contaminative and costly, and it lacks durability to physical impacts. The MLCC is more attractive due to its better resistance to high voltage, thermostability, wide range of employable temperatures and lower loss of high-frequency usage. Furthermore, the size of the MLCC can be minimized through chip formation, and it is cheaper and more stable for mass production in the real world.
Characterization the influences of diodes to piezoelectric energy harvester
Published in International Journal of Smart and Nano Materials, 2018
Ming Yuan, Ziping Cao, Jun Luo
During the experimental test, the acceleration of the base is kept to be 0.1g at a 299 Hz frequency. The test structure is wired to a full-wave bridge circuit composed of different diode types. A 33 tantalum capacitor (AVX brand) is selected as the energy storage device. The tantalum capacitor has a remarkable smaller leakage loss than the electrolytic capacitor, which is suitable for the harvested energy conservation. The stored energy inside the capacitor is calculated according to Equation (4):