Regimes of piezoelectric transformer operation

Kartashev, I. I.; Vontz, T.; Florian, H

doi:10.1088/0957-0233/17/8/014

Cited by 25 publications

(25 citation statements)

References 12 publications

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“…Excessive mechanical deformation might even result in the mechanical crack of the PT element. A discussion on the operating parameters with respect to non-linearities, high mechanical strain, high power dissipation and other key issues for PT was done by Kartashev et al 6,7 Dissipated heat causes temperature change and related change of the mechanical, piezoelectric and dielectric coefficients. Resonance frequency might shift with the temperature as a result of it.…”

Section: Resultsmentioning

confidence: 99%

“…Transformation parameters are related to material properties such as electromechanical coupling factor k , mechanical quality Q and dielectric loss tan( δ ). For more information on the typical driving conditions and their limits, see, for example, Kartashev et al 6,7 The voltage transformation ratio saturates at open circuit conditions contrary to the current transformation ratio. Efficiency is the best for an optimum impedance load in output circuit and could reach almost 100%.…”

Section: Introductionmentioning

confidence: 99%

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Bulk piezoelectric ceramic transformers

Erhart¹

2013

Advances in Applied Ceramics

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In this contribution, we present a review on the various bulk piezoelectric ceramic transformers based on planar vibration modes. The studied transformer shapes include rectangular bar, rings and discs (e.g. disc ring dot) homogeneously poled in the thickness direction. Electrical parameters like transformation ratio, efficiency and input and output power are measured and modelled as a function of frequency and resistive load in the secondary circuit. Analytical modelling has been performed for the 'Rosen type' and 'ring dot' disc or ring transformers as well as for the bar transformers and several other geometries. Finite element analysis modelling has been performed for the set of other more complicated disc transformer geometries. An overview of the results on the studied transformers is presented, including data on transformation ratio, efficiency and optimum load.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bulk piezoelectric ceramic transformers

Erhart¹

2013

Advances in Applied Ceramics

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“…The lowering of the PCPG output voltage results in less efficient discharge, and, consequently, in reduced production of chemically active species. On the other hand, it is known that the thermal stabilization of the RPT takes several minutes [81], causing variations of the device efficiency. It is also observed in PCPG that the amplitude of the output voltage and the number of micro-discharges per cycle of piezoelectric oscillation decrease with time of operation of non-cooled PCPG operated with 5 W [68].…”

Section: Thermal Characterizationmentioning

confidence: 99%

Piezoelectric Direct Discharge: Devices and Applications

Korzec¹,

Hoppenthaler²,

Nettesheim³

2020

Plasma

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The piezoelectric direct discharge (PDD) is a comparatively new type of atmospheric pressure gaseous discharge for production of cold plasma. The generation of such discharge is possible using the piezoelectric cold plasma generator (PCPG) which comprises the resonant piezoelectric transformer (RPT) with voltage transformation ratio of more than 1000, allowing for reaching the output voltage >10 kV at low input voltage, typically below 25 V. As ionization gas for the PDD, either air or various gas mixtures are used. Despite some similarities with corona discharge and dielectric barrier discharge, the ignition of micro-discharges directly at the ceramic surface makes PDD unique in its physics and application potential. The PDD is used directly, in open discharge structures, mainly for treatment of electrically nonconducting surfaces. It is also applied as a plasma bridge to bias different excitation electrodes, applicable for a broad range of substrate materials. In this review, the most important architectures of the PDD based discharges are presented. The operation principle, the main operational characteristics and the example applications, exploiting the specific properties of the discharge configurations, are discussed. Due to the moderate power achievable by PCPG, of typically less than 10 W, the focus of this review is on applications involving thermally sensitive materials, including food, organic tissues, and liquids.

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“…For instance, silica capillary nozzles were treated before dipping into a silanisation solution [31] or polymer brushes were grafted on the plasma-treated polytetrafluoroethylene, polypropylene, and polyethylene surfaces for allowing better wettability of these surfaces. [32] From 2006 to 2009, EPCOS in Deutschlandsberg gathered extensive experience in development [33,34] and production of PTs with voltage transformation ratio, which is high enough for ignition of atmospheric pressure discharges in the air even for small primary voltages in the range of 5-25 V. The result of the high-performance PT development is the CeraPlas™ F [35] allowing for piezoelectric direct discharge (PDD). This PT enabled the development of the first handheld piezoelectric device worldwide, generating plasma with ambient air as ionization gas.…”

Section: ------------------------------------------------------------mentioning

confidence: 99%

“…From 2006 to 2009, EPCOS in Deutschlandsberg gathered extensive experience in development [ 33,34 ] and production of PTs with voltage transformation ratio, which is high enough for ignition of atmospheric pressure discharges in the air even for small primary voltages in the range of 5–25 V. The result of the high‐performance PT development is the CeraPlas™ F [ 35 ] allowing for piezoelectric direct discharge (PDD). This PT enabled the development of the first handheld piezoelectric device worldwide, generating plasma with ambient air as ionization gas.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric pressure plasma jet powered by piezoelectric direct discharge

Korzec¹,

Hoppenthaler²,

Burger³

et al. 2020

Plasma Processes & Polymers

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The piezoelectric direct discharge sustained using a high-performance piezoelectric transformer (PT) with a voltage transformation ratio of >1,000 was used for the generation of an atmospheric pressure plasma jet (APPJ). The ionization gases used are ambient air and compressed dry air. The APPJ was characterized using capacitive probe measurement, ozone concentration measurement, and activation area determination. The activation experiments were conducted on a highdensity polyethylene. The activation area was visualized using pure formamide test ink (58 mN/m) and captured by a digital camera. The influence of gas flow, PT power, and the distance between the PT and the substrate were investigated. K E Y W O R D S atmospheric pressure plasma jet (APPJ), CeraPlas™ F, piezoelectric direct discharge (PDD), piezoelectric transformer (PT), plasma surface treatment This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Regimes of piezoelectric transformer operation

Cited by 25 publications

References 12 publications

Bulk piezoelectric ceramic transformers

Bulk piezoelectric ceramic transformers

Piezoelectric Direct Discharge: Devices and Applications

Atmospheric pressure plasma jet powered by piezoelectric direct discharge

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