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HAIT Journal of Science and Engineering B Volume 2, Issues 5-6, pp. 830-847 © 2005 Holon Academic Institute of Technology | ||||
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Feedback isolation by piezoelectric transformers: | ||||
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Power Electronics Laboratory, Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel *Corresponding author: simonl@ee.bgu.ac.il Received 1 March 2005, accepted 10 July 2005 | ||||
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Signal isolation is needed in power electronics systems that include separate primary and secondary 'grounds'. The feasibility of using a piezoelectric transformer (PT) as a galvanic barrier was investigated in this study theoretically and experimentally. The research included the issues of drive, demodulation, bandwidth, and common mode rejection. In particular, two types of excitation signals were compared: amplitude modulated and frequency modulated. The frequency response of the piezoelectric isolator was studied both by small signal envelope simulation using ORCAD/PSPICE and experimentally. It is concluded that the FM approach offers a larger BW but the AM scheme seems to be easier to implement. Keywords: Acoustoelectric devices, isolators, piezoelectric devices, transformers, AM, FM. | ||||
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