New design method of piezoelectric transformer considering high-power characteristics of various composition ceramics

Processing and properties of a dome-shaped piezoelectric transformer with a composition of 0.03Pb(Sb0.5Nb0.5)O3-0.03Pb(Mn1/3Nb2/3)O3-0.465PbTiO3-0.475PbZrO3 have been investigated. A dome-shaped sample was fabricated by powder injection molding. The dimension of the domeshaped sample was a 28 mm in diameter and 2.1mm in thickness with a curvature radius of 18 mm. Finite element modeling for the complicated piezoelectric transformer was applied to simulate strains and vibration mode in the sample. The high power characteristics of a dome-shaped piezoelectric transformer were examined by the lighting test for 27 and 34 watt T5 circle lamps connected in series. The series connected T5 circle lamps were successfully driven by the domeshaped piezoelectric transformer with sustaining efficiency higher than 98.5%. The transformer with ring(input)/dot(output) electrode ratio of 2.5 exhibited the maximum properties in terms of output power, efficiency and temperature stability.

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Energy Efficiency Alloy Design in PSN-PMN-PZT Ceramic System for Piezoelectric Transformer Application

Materials Science Forum ◽

10.4028/www.scientific.net/msf.510-511.690 ◽

2006 ◽

Vol 510-511 ◽

pp. 690-693 ◽

Cited By ~ 2

Author(s):

Y.G. Choi ◽

Y.-J. Son ◽

Joon Chul Kwon ◽

K.W. Cho ◽

Soon Young Kweon ◽

...

Keyword(s):

High Power ◽

Electromechanical Coupling ◽

Power Transformer ◽

Electromechanical Coupling Factor ◽

Mechanical Quality Factor ◽

Alloy Design ◽

Laser Vibrometer ◽

Ceramic System ◽

Piezoelectric Transformer ◽

Power Characteristics

To enhance high power characteristics for piezoelectric transformer, an alloy design approach in PZT base ceramic system was considered. Various Zr/Ti ratio compositions in 0.03Pb(Sb0.5Nb0.5)O3- 0.03Pb(Mn1/3Nb2/3)O3-(0.94-x)PbTiO3-xPbZrO3 (0.445x0.475 mol)[PSN - PMN - PZT] system were synthesized by the conventional bulk ceramic processing technique. To improve high power characteristics at their morphotropic phase boundary (MPB) composition of PSN-PMN-PZT system, various spectra of Zr/Ti ratio were systematically experimented, and their effects on the subsequent piezoelectric properties and dielectric properties for high power piezoelectric transformer application were investigated using an impedance analyzer and a laser vibrometer. Microstructure and phase information were characterized using X-ray diffractometer (XRD) and a scanning electron microscope (SEM). When the Zr/Ti ratios were 0.475/0.465, the mechanical quality factor and electromechanical coupling factor were shown to reach the maximum, indicating that this alloy design can be a feasible composition for high power transformer.

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Dome-Shaped High Power Transformer for Driving A 55 W PL Lamp

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.124-126.199 ◽

2007 ◽

Vol 124-126 ◽

pp. 199-202

Author(s):

Man Soon Yoon ◽

H.K. Kim ◽

Soon Chul Ur

Keyword(s):

High Power ◽

Power Efficiency ◽

Vibration Mode ◽

Power Transformer ◽

Temperature Stability ◽

Area Ratio ◽

Powder Injection ◽

Curvature Radius ◽

Piezoelectric Transformer ◽

Power Characteristics

Processing and properties of a dome-shaped piezoelectric transformer with a composition of 0.03Pb(Sb0.5Nb0.5)O3-0.03Pb(Mn1/3Nb2/3)O3-0.465PbTiO3-0.475PbZrO3 have been investigated. A dome-shaped sample was fabricated by powder injection molding. The dimension of the dome-shaped sample was a 28 mm in diameter and 2.1mm in thickness with a curvature radius of 18 mm. Finite element modeling for the complicated piezoelectric transformer was applied to simulate vibration mode in the sample. The high power characteristics of a dome-shaped piezoelectric transformer were examined by the lighting test for a 55W PL lamp. The 55W PL lamp was successfully driven by the dome-shaped piezoelectric transformer with sustaining efficiency higher than 98%. The transformer with ring/dot area ratio of 2.1 exhibited the maximum properties in terms of output power, efficiency and temperature stability.

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