---
_id: '9541'
abstract:
- lang: eng
text: Piezoelectric transformers are increasingly getting popular in the electrical
devices owing to several advantages such as small size, high efficiency, no electromagnetic
noise and non-flammable. In addition to the conventional applications such as
ballast for back light inverter in notebook computers, camera flash, and fuel
ignition several new applications have emerged such as AC/DC converter, battery
charger and automobile lighting. These new applications demand high power density
and wide range of voltage gain. Currently, the transformer power density is limited
to $40 W/cm{^3}$ obtained at low voltage gain. The purpose of this study was to
investigate a transformer design that has the potential of providing higher power
density and wider range of voltage gain. The new transformer design utilizes radial
mode both at the input and output port and has the unidirectional polarization
in the ceramics. This design was found to provide 30 W power with an efficiency
of 98\% and 30 $\,^{\circ}$C temperature rise from the room temperature. An electro-mechanical
equivalent circuit model was developed to describe the characteristics of the
piezoelectric transformer. The model was found to successfully predict the characteristics
of the transformer. Excellent matching was found between the computed and experimental
results. The results of this study will allow to deterministically design unipoled
piezoelectric transformers with specified performance. It is expected that in
near future the unipoled transformer will gain significant importance in various
electrical components.
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: S
full_name: Priya, S
last_name: Priya
citation:
ama: Hemsel T, Priya S. Model based analysis of piezoelectric transformers. Ultrasonics.
2006;44, Supplement(0):e741-e745. doi:10.1016/j.ultras.2006.05.086
apa: Hemsel, T., & Priya, S. (2006). Model based analysis of piezoelectric transformers.
Ultrasonics, 44, Supplement(0), e741–e745. https://doi.org/10.1016/j.ultras.2006.05.086
bibtex: '@article{Hemsel_Priya_2006, title={Model based analysis of piezoelectric
transformers}, volume={44, Supplement}, DOI={10.1016/j.ultras.2006.05.086},
number={0}, journal={Ultrasonics}, author={Hemsel, Tobias and Priya, S}, year={2006},
pages={e741–e745} }'
chicago: 'Hemsel, Tobias, and S Priya. “Model Based Analysis of Piezoelectric Transformers.”
Ultrasonics 44, Supplement, no. 0 (2006): e741–45. https://doi.org/10.1016/j.ultras.2006.05.086.'
ieee: T. Hemsel and S. Priya, “Model based analysis of piezoelectric transformers,”
Ultrasonics, vol. 44, Supplement, no. 0, pp. e741–e745, 2006.
mla: Hemsel, Tobias, and S. Priya. “Model Based Analysis of Piezoelectric Transformers.”
Ultrasonics, vol. 44, Supplement, no. 0, 2006, pp. e741–45, doi:10.1016/j.ultras.2006.05.086.
short: T. Hemsel, S. Priya, Ultrasonics 44, Supplement (2006) e741–e745.
date_created: 2019-04-29T09:22:21Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
doi: 10.1016/j.ultras.2006.05.086
issue: '0'
keyword:
- Piezoelectric transformers
language:
- iso: eng
page: e741 - e745
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Model based analysis of piezoelectric transformers
type: journal_article
user_id: '55222'
volume: 44, Supplement
year: '2006'
...
---
_id: '8926'
abstract:
- lang: eng
text: Piezoelectric transformers are well known since the publication of some patent
applications at the end of the 1950s. But until today their only business use
lies in the field of backlighting systems for LCDs. Due to key features as light-weight,
flatness, high step-up at low volume and high efficiency piezoelectric transformers
should be usable in a much broader range of applications. This contribution returns
to mind their operating principle, shows how to model and to develop such devices
as well as give some aspects for development trends that will lead to further
applications.
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Jörg
full_name: Wallaschek, Jörg
last_name: Wallaschek
citation:
ama: 'Hemsel T, Littmann W, Wallaschek J. Piezoelectric transformers - state of
the art and development trends. In: Ultrasonics Symposium, 2002. Proceedings.
2002 IEEE. Vol 1. ; 2002:645-648. doi:10.1109/ULTSYM.2002.1193485'
apa: Hemsel, T., Littmann, W., & Wallaschek, J. (2002). Piezoelectric transformers
- state of the art and development trends. In Ultrasonics Symposium, 2002.
Proceedings. 2002 IEEE (Vol. 1, pp. 645–648). https://doi.org/10.1109/ULTSYM.2002.1193485
bibtex: '@inproceedings{Hemsel_Littmann_Wallaschek_2002, title={Piezoelectric transformers
- state of the art and development trends}, volume={1}, DOI={10.1109/ULTSYM.2002.1193485},
number={vol.1}, booktitle={Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE},
author={Hemsel, Tobias and Littmann, Walter and Wallaschek, Jörg}, year={2002},
pages={645–648} }'
chicago: Hemsel, Tobias, Walter Littmann, and Jörg Wallaschek. “Piezoelectric Transformers
- State of the Art and Development Trends.” In Ultrasonics Symposium, 2002.
Proceedings. 2002 IEEE, 1:645–48, 2002. https://doi.org/10.1109/ULTSYM.2002.1193485.
ieee: T. Hemsel, W. Littmann, and J. Wallaschek, “Piezoelectric transformers - state
of the art and development trends,” in Ultrasonics Symposium, 2002. Proceedings.
2002 IEEE, 2002, vol. 1, no. vol.1, pp. 645–648.
mla: Hemsel, Tobias, et al. “Piezoelectric Transformers - State of the Art and Development
Trends.” Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE, vol. 1, no.
vol.1, 2002, pp. 645–48, doi:10.1109/ULTSYM.2002.1193485.
short: 'T. Hemsel, W. Littmann, J. Wallaschek, in: Ultrasonics Symposium, 2002.
Proceedings. 2002 IEEE, 2002, pp. 645–648.'
date_created: 2019-04-15T10:18:15Z
date_updated: 2022-01-06T07:04:05Z
department:
- _id: '151'
doi: 10.1109/ULTSYM.2002.1193485
intvolume: ' 1'
issue: vol.1
keyword:
- piezoelectric devices
- reviews
- transformers
- backlighting systems
- flatness
- high efficiency piezoelectric transformers
- high step-up
- light-weight
- low volume
- operating principle
- piezoelectric transformers
- Circuits
- Costs
- Electromagnetic devices
- Electromagnetic fields
- Mechanical energy
- Piezoelectric materials
- Power electronics
- Switching frequency
- Transformers
- Vibrations
language:
- iso: eng
page: 645-648
publication: Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE
publication_identifier:
issn:
- 1051-0117
status: public
title: Piezoelectric transformers - state of the art and development trends
type: conference
user_id: '55222'
volume: 1
year: '2002'
...