A brief introduction to ceramic capacitors

Pan, Ming‐Jen; Randall, Clive A.

doi:10.1109/mei.2010.5482787

Cited by 424 publications

(182 citation statements)

References 24 publications

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“…[1][2][3] Equally, as their operation is not reliant on the kinetics associated with large-scale ion migration, they can demonstrate strong thermal stability, 4 and can operate reliably in high temperature environments where other technologies struggle. 5,6 A major drawback, however, is that the energy stored per unit volume (energy density) in bulk and thick film devices is relatively low: in BaTiO 3 , SrTiO 3 (STO), or PbZrO 3 bulk ceramics 7 and in commercial X7R capacitors 8,9 typical energy densities have been found to be 1-2 Jcc À1 . Slightly higher values ($6 Jcc -1 ) have been demonstrated in other material systems, 8,9 but are still relatively modest.…”

mentioning

confidence: 99%

Increasing recoverable energy storage in electroceramic capacitors using “dead-layer” engineering

McMillen¹,

Douglas²,

Correia³

et al. 2012

Applied Physics Letters

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The manner in which ultrathin films of alumina, deposited at the dielectric-electrode interface, affect the recoverable energy density associated with (BiFeO3)0.6–(SrTiO3)0.4 (BFST) thin film capacitors has been characterised. Approximately 6 nm of alumina on 400 nm of BFST increases the maximum recoverable energy of the system by around 30% from ∼13 Jcc−1 to ∼17 Jcc−1. Essentially, the alumina acts in the same way as a naturally present parasitic “dead-layer,” distorting the polarisation-field response such that the ultimate polarisation associated with the BFST is pushed to higher values of electric field. The work acts as a proof-of-principle to illustrate how the design of artificial interfacial dielectric “dead-layers” can increase energy densities in simple dielectric capacitors, allowing them to compete more generally with other energy storage technologies.

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mentioning

confidence: 99%

Increasing recoverable energy storage in electroceramic capacitors using “dead-layer” engineering

McMillen¹,

Douglas²,

Correia³

et al. 2012

Applied Physics Letters

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“…And this also shows that La 2 O 3 acts as a nucleating agent and promotes the crystallization of the major crystalline phase from the glass matrix. Therefore, in this glass system, phase separation took place when the appropriate concentration of La 2 Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, in recent years, significant efforts have been made to develop dielectric materials with high energy storage density [1,2]. Among these materials, barium strontium titanate Ba x Sr 1Àx TiO 3 (BST) ferroelectric glass-ceramics have been recognized as one of the most promising candidates in terms of their high dielectric constants and high breakdown strengths [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Blocking effect of crystal–glass interface in lanthanum doped barium strontium titanate glass–ceramics

Wang¹,

Zhang²,

Батурин³

et al. 2013

Materials Research Bulletin

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“…Its most important attributes are its high capacitance and compactness [97][98][99]. The most expensive of the four capacitor options, ceramic capacitors offer very high AC current ratings, high temperature operation (up to 200°C) and small size.…”

Section: Ceramic Capacitorsmentioning

confidence: 99%

Integrated motor drives: state of the art and future trends

2017

IET Electric Power Applications

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With increased need for high power density, high efficiency and high temperature capabilities in aerospace and automotive applications, integrated motor drives (IMD) offers a potential solution. However, close physical integration of the converter and the machine may also lead to an increase in components temperature. This requires careful mechanical, structural and thermal analysis; and design of the IMD system. This study reviews existing IMD technologies and their thermal effects on the IMD system. The effects of the power electronics position on the IMD system and its respective thermal management concepts are also investigated. The challenges faced in designing and manufacturing of an IMD along with the mechanical and structural impacts of close physical integration is also discussed and potential solutions are provided. Potential converter topologies for an IMD like the matrix converter, two-level bridge, three-level neutral point clamped and multiphase full bridge converters are also reviewed. Wide band gap devices like silicon carbide and gallium nitride and their packaging in power modules for IMDs are also discussed. Power modules components and packaging technologies are also presented. IntroductionOver the last two decades there has been a shift from traditional physically separated motor and drive systems to more compact, power dense, motor-drive combinations [1]. This new power-dense motor-drive structure combines both the motor and its associated control and drive circuitry within a single enclosure. The earliest records of commercially available motor-drive systems were manufactured by Grundfos in 1991 and Franz Morat KG in 1993 [2].These compact systems have been called a variety of names from 'smart motors' to 'integrated motors', the latter forming the foundation for the new moniker currently identified with these systems [3]. The term 'integrated motor drive (IMD)' is the latest associated with this class of products and is as a result of the success of a TB Woods Inc. manufactured motor-drive registered under the same name [3].IMDs are increasingly being developed and produced by machine manufacturers due to the significant potential benefits they offer. The most significant of these benefits include direct replacement of inefficient direct on line motors, increased power density, lower losses and lower costs compared with separate motor and drive solutions. Technological advancements over the last decade have led to the development of robust electronic components able to withstand the harsh environments required by some forms of integration [4]. By eliminating separate enclosures and long cable runs, the integrated approach promises to lower system costs by 20 to 40% [5].Elimination of transmission cables has economic advantages, including increased reliability due to the removal of the output filter commonly required for long cables. Removal of long cable runs and integration into a single package will also significantly reduce potential electromagnetic interference (EMI). This a...

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A brief introduction to ceramic capacitors

Cited by 424 publications

References 24 publications

Increasing recoverable energy storage in electroceramic capacitors using “dead-layer” engineering

Increasing recoverable energy storage in electroceramic capacitors using “dead-layer” engineering

Blocking effect of crystal–glass interface in lanthanum doped barium strontium titanate glass–ceramics

Integrated motor drives: state of the art and future trends

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