Fundamental limits on energy transfer and circuit considerations for piezoelectric transformers

被引:149
作者
Flynn, AM [1 ]
Sanders, SR
机构
[1] Microprop Corp, Berkeley, CA 94704 USA
[2] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA
关键词
piezoelectric; soft-switching; transformer; work cycle;
D O I
10.1109/63.988662
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This work investigates fundamental limits on electromechanical energy conversion capacity of piezoelectric transformers by considering a work cycle analysis. Fundamental limitations in a lossless piezoelectric transformer are imposed by maximum electric field strength, maximum surface charge density, maximum stress, and maximum strain. For the lossless case, our analysis indicates that the mechanical stress limit is the effective constraint in typical PZT materials. For a specific PZT-5H sample considered, a mechanical stress-limited work cycle indicates that this material can handle 330 W/cm(3) at 100 kHz. A second direction this work has taken has been an investigation into a soft-switching drive and control circuit, that does not require any magnetic components. The theory of operation of soft-switching resonant drive circuitry is discussed, and experimental results on a soft-switching inverter incorporating no magnetic components are reported.
引用
收藏
页码:8 / 14
页数:7
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