Fabrication and characterization of piezoelectric Pb(Zr,Ti)O3-Pb(Mn,W,Sb,Nb)O3 step-down piezoelectric transformer

Guo

et al. 2010

AMR

In this study, a disk-shaped step-down piezoelectric transformer that consists of Mg:LN single crystals operating in the extensional vibration mode was proposed, and its characteristics wre investigated. This paper proposed the PT using ring/dot electrode which had an outer diameter of 22 mm, a narrow annular gap circle of 1.0 mm and a thickness of 1.0 mm. The transformer was poled along the thickness direction. The top surface was covered by two ring-shaped electrodes separated by a narrow annular gap, and the regions covered by the outer and inner ring electrodes serve as the output and input parts of the transformer, respectively. The bottom surface was fully covered with a gold electrode. Moreover, according to the physical equivalent circuit model of the latest invented vibration mode, PT of Mg:LN single crystals were fabricated and characterized. Finally, we investigated the gain under different load resistances and input voltage.

Section: Introductionmentioning

confidence: 99%

A Study on the Disk-Type Piezoelectric Transformer of Mg:LN Single Crystal

Guo

et al. 2010

AMR

J. Phys. D: Appl. Phys.

“…At the same time, in order to further improve the performance of piezoelectric transformers, many efforts have been made to synthesize hard polycrystalline piezoelectric materials due to their high mechanical quality factor (Q m ) which can improve the voltage gain [7][8][9]. However, as a result of their comparatively low dielectric strength, the electrical energy is difficult to transfer.…”

Section: Introductionmentioning

confidence: 99%

Multilayer Rosen-type piezoelectric transformer prepared with Pb(Mg_1/3Nb_2/3)O₃–PbTiO₃ single crystal

Wang¹,

Ge²,

Yu³

et al. 2008

A multilayer Rosen-type piezoelectric transformer with the size of 20 mm length, 4 mm width and 2.8 mm thickness has been fabricated using ferroelectric single crystal Pb(Mg1/3Nb2/3)O3–PbTiO3. The electrical properties of the prepared transformer were systematically investigated. Results show that the efficiency of this transformer can reach 92% and the voltage step-up ratio under open circuit exceeds 100. Comparing this with the single-layer Rosen-type transformer, we reported lower output impedance and larger step-up voltage ratios have been obtained under the same load resistance. Near the resonance frequency, this transformer has a much purer vibration mode and wider working bandwidth. Furthermore, this transformer can successfully drive a 0.5 W LCD backlight under a lower input voltage without obvious temperature rise. These global properties make this piezoelectric transformer a promising candidate for small power inverters and cryogenic applications.

“…Compared with magnetic transformers, piezoelectric transformers are thinner, electromagnetic noise-free, small size, lighter weight, and high efficiency. 1,2) The multilayer structured piezoelectric transformers were suggested to increase output power because conventional single layer Rosen-type piezoelectric transformers operated at high voltage and low current could not be successfully used for high power devices. In particular, in case of a stepdown type piezoelectric transformer for AC-DC converter application, its output capacitance should be also greater than the input capacitance since the higher capacitance can lead the larger output current.…”

mentioning

confidence: 99%

Electrical Properties of Low Temperature Sintering Step-Down Multilayer Piezoelectric Transformer

Yoo

Kim

Jeong³

2007

jjap

The multilayer structured ceramic transformers were sintered at the low temperature of 940 C and manufactured with the size of 27 Â 27 Â 2:2 mm 3 , respectively, using 0.07Pb(Mn 1=3 Nb 2=3 )O 3 -0.06Pb(Zn 1=3 Nb 2=3 )O 3 -0.87Pb(Zr 0:48 Ti 0:52 )O 3 (A-type) and 0.07Pb(Mn 1=3 Nb 2=3 )O 3 -0.10Pb(Ni 1=3 Nb 2=3 )O 3 -0.83Pb(Zr 0:48 Ti 0:52 )O 3 (B-type) composition ceramics. And then, their electrical properties were investigated according to the variations of frequency and load resistance. The voltage step-up ratio of the transformers showed the maximum values at the vicinity of 69 kHz. At the load resistance of 100 , A-type and B-type piezoelectric transformers showed the temperature rises of about 21 C at the output power of 15 and 18 W, respectively. At B-type transformer with high effective electromechanical coupling factor (k eff ) and high piezoelectric constant (d 33 ), lower temperature increase was relatively appeared.