---
_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. <i>Ultrasonics</i>.
    2006;44, Supplement(0):e741-e745. doi:<a href="https://doi.org/10.1016/j.ultras.2006.05.086">10.1016/j.ultras.2006.05.086</a>
  apa: Hemsel, T., &#38; Priya, S. (2006). Model based analysis of piezoelectric transformers.
    <i>Ultrasonics</i>, <i>44</i>, <i>Supplement</i>(0), e741–e745. <a href="https://doi.org/10.1016/j.ultras.2006.05.086">https://doi.org/10.1016/j.ultras.2006.05.086</a>
  bibtex: '@article{Hemsel_Priya_2006, title={Model based analysis of piezoelectric
    transformers}, volume={44, Supplement}, DOI={<a href="https://doi.org/10.1016/j.ultras.2006.05.086">10.1016/j.ultras.2006.05.086</a>},
    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.”
    <i>Ultrasonics</i> 44, Supplement, no. 0 (2006): e741–45. <a href="https://doi.org/10.1016/j.ultras.2006.05.086">https://doi.org/10.1016/j.ultras.2006.05.086</a>.'
  ieee: T. Hemsel and S. Priya, “Model based analysis of piezoelectric transformers,”
    <i>Ultrasonics</i>, vol. 44, Supplement, no. 0, pp. e741–e745, 2006.
  mla: Hemsel, Tobias, and S. Priya. “Model Based Analysis of Piezoelectric Transformers.”
    <i>Ultrasonics</i>, vol. 44, Supplement, no. 0, 2006, pp. e741–45, doi:<a href="https://doi.org/10.1016/j.ultras.2006.05.086">10.1016/j.ultras.2006.05.086</a>.
  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: <i>Ultrasonics Symposium, 2002. Proceedings.
    2002 IEEE</i>. Vol 1. ; 2002:645-648. doi:<a href="https://doi.org/10.1109/ULTSYM.2002.1193485">10.1109/ULTSYM.2002.1193485</a>'
  apa: Hemsel, T., Littmann, W., &#38; Wallaschek, J. (2002). Piezoelectric transformers
    - state of the art and development trends. In <i>Ultrasonics Symposium, 2002.
    Proceedings. 2002 IEEE</i> (Vol. 1, pp. 645–648). <a href="https://doi.org/10.1109/ULTSYM.2002.1193485">https://doi.org/10.1109/ULTSYM.2002.1193485</a>
  bibtex: '@inproceedings{Hemsel_Littmann_Wallaschek_2002, title={Piezoelectric transformers
    - state of the art and development trends}, volume={1}, DOI={<a href="https://doi.org/10.1109/ULTSYM.2002.1193485">10.1109/ULTSYM.2002.1193485</a>},
    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 <i>Ultrasonics Symposium, 2002.
    Proceedings. 2002 IEEE</i>, 1:645–48, 2002. <a href="https://doi.org/10.1109/ULTSYM.2002.1193485">https://doi.org/10.1109/ULTSYM.2002.1193485</a>.
  ieee: T. Hemsel, W. Littmann, and J. Wallaschek, “Piezoelectric transformers - state
    of the art and development trends,” in <i>Ultrasonics Symposium, 2002. Proceedings.
    2002 IEEE</i>, 2002, vol. 1, no. vol.1, pp. 645–648.
  mla: Hemsel, Tobias, et al. “Piezoelectric Transformers - State of the Art and Development
    Trends.” <i>Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE</i>, vol. 1, no.
    vol.1, 2002, pp. 645–48, doi:<a href="https://doi.org/10.1109/ULTSYM.2002.1193485">10.1109/ULTSYM.2002.1193485</a>.
  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'
...