2013
Bar Piezoelectric Ceramic Transformers
ERHART, Jiří; Petr PŮLPÁN and Luboš RUSINBasic information
Original name
Bar Piezoelectric Ceramic Transformers
Authors
ERHART, Jiří (203 Czech Republic, belonging to the institution); Petr PŮLPÁN (203 Czech Republic, belonging to the institution) and Luboš RUSIN (203 Czech Republic, belonging to the institution)
Edition
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2013, 0885-3010
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
Electronics and optoelectronics
Country of publisher
United States of America
Confidentiality degree
is not subject to a state or trade secret
References:
RIV identification code
RIV/46747885:24510/13:#0000988
Organization
Faculty of Science, Humanities and Education – Technical University of Liberec – Repository
UT WoS
000321629200018
Keywords in English
piezoelectric transformer
Links
GAP102/10/1139, research and development project.
Changed: 10/3/2015 13:50, RNDr. Daniel Jakubík
Abstract
In the original language
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.