TY - CONF AB - 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. AU - Hemsel, Tobias AU - Littmann, Walter AU - Wallaschek, Jörg ID - 8926 IS - vol.1 KW - piezoelectric devices KW - reviews KW - transformers KW - backlighting systems KW - flatness KW - high efficiency piezoelectric transformers KW - high step-up KW - light-weight KW - low volume KW - operating principle KW - piezoelectric transformers KW - Circuits KW - Costs KW - Electromagnetic devices KW - Electromagnetic fields KW - Mechanical energy KW - Piezoelectric materials KW - Power electronics KW - Switching frequency KW - Transformers KW - Vibrations SN - 1051-0117 T2 - Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE TI - Piezoelectric transformers - state of the art and development trends VL - 1 ER -