Transformation ratio of “ring-dot” planar piezoelectric transformer

Půlpán, Petr; Erhart, Jiřı́

doi:10.1016/j.sna.2007.06.011

Cited by 26 publications

(16 citation statements)

References 29 publications

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“…For further details on the measurement, see e.g. [3]. The transformer efficiency and the transformation ratio were measured as a function of frequency and impedance load in the secondary circuit.…”

Section: Methodsmentioning

confidence: 99%

“…For the review on vibration modes for piezoelectric transformers, see e.g., [2]. The analytical formulae for the specific one-dimensional vibration modes were calculated for ringdot PTs [3], rosen-type PTs, and their shear modification [4], [5]. The electrical driving conditions and their limitations with respect to the mechanical and electrical losses were discussed in [6] and [7] for the high-power operation.…”

Section: Introductionmentioning

confidence: 99%

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Bar piezoelectric ceramic transformers

Erhart

Půlpán

Rusin

2013

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Bar-shaped piezoelectric ceramic transformers (PTs) working in the longitudinal vibration mode (k31 mode) were studied. Two types of the transformer were designed--one with the electrode divided into two segments of different length, and one with the electrodes divided into three symmetrical segments. Parameters of studied transformers such as efficiency, transformation ratio, and input and output impedances were measured. An analytical model was developed for PT parameter calculation for both two- and three-segment PTs. Neither type of bar PT exhibited very high efficiency (maximum 72% for three-segment PT design) at a relatively high transformation ratio (it is 4 for two-segment PT and 2 for three-segment PT at the fundamental resonance mode). The optimum resistive loads were 20 and 10 kΩ for two- and three-segment PT designs for the fundamental resonance, respectively, and about one order of magnitude smaller for the higher overtone (i.e., 2 kΩ and 500 Ω, respectively). The no-load transformation ratio was less than 27 (maximum for two-segment electrode PT design). The optimum input electrode aspect ratios (0.48 for three-segment PT and 0.63 for two-segment PT) were calculated numerically under no-load conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bar piezoelectric ceramic transformers

Erhart

Půlpán

Rusin

2013

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…3 This type of PT exhibits very good transformation ratio, efficiency and simple vibration mode spectrum. The \ring-dot" geometry was also studied for thin PZT ring.…”

Section: Introductionmentioning

confidence: 99%

Parameters and design optimization of the ring piezoelectric ceramic transformer

Erhart

2015

J. Adv. Dielect.

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Main aim of the presented paper is the theoretical analysis and experimental verification of the transformation parameters for the new type of nonhomogeneously poled ring transformer. The input part is poled in the thickness direction and output part in the radial direction. Two transformer geometries are studied -the input part is at inner ring segment, or it is at the outer ring segment. The optimum electrode size aspect ratios have been found experimentally as d 1 =D % 0:60 À 0:65 for the ring with aspect ratio d=D ¼ 0:2. The fundamental as well as higher overtone resonances were studied for the transformation ratio, the optimum resistive load, efficiency and no-load transformation ratio. Higher overtones have better transformation parameters compared to the fundamental resonance. The new type ring transformer exhibits very high transformation ratios up to 200 under no-load and up to 13.4 under a high efficiency of 97% at the optimum load conditions of 10 k. Strong electric field gradient at the output circuit is applicable for the electrical discharge generation.

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“…However, the fabrication of multilayer Rosen transformers is not well suited to miniaturization, prohibiting their use in a range of small scale systems such as interfaces for micro power harvesting platforms that demand efficient and high gain voltage conversion. An alternate transformer topology based on a disk-shaped resonator with annular electrodes can avoid this limitation, but fabrication by traditional machining or solution casting methods have limited the size of these devices to the range of several centimeters or more [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Microfabricated Bulk PZT Piezoelectric Disk Transformers

Mirzaeimghri¹,

Hareesh²,

Misri³

et al. 2014

2014 Solid-State, Actuators, and Microsystems Workshop Technical Digest

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A new class of miniature monolithic piezoelectric transformer that leverages a simple two-mask bulk piezoelectric microfabrication process is presented. A millimeter-scale transformer design based on a disk-shaped resonator topology with annular electrodes is fabricated to produce step-up voltages in a compact form factor. The radial vibration characteristics and voltage gain of the bulk transformers under varying impedance loads have been analyzed experimentally, and compared against an electromechanical model of transformer performance. A maximum voltage gain of 7.3 was obtained.

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Transformation ratio of “ring-dot” planar piezoelectric transformer

Cited by 26 publications

References 29 publications

Bar piezoelectric ceramic transformers

Bar piezoelectric ceramic transformers

Parameters and design optimization of the ring piezoelectric ceramic transformer

Microfabricated Bulk PZT Piezoelectric Disk Transformers

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