Manufacturing Industry
Circular piezoelectric devices make more efficient transformers.
Advanced Ceramics Report, April, 2000
US researchers have developed circular piezoelectric transformers that may find uses in thinner portable computers.
Scientists at Penn State University make the disc-shaped transformers from lead zirconate titanate (PZT) that is doped with manganese and cerium.
One of the main researchers on the project, Dr Kenji Uchino, Professor of Electrical Engineering and a member of Penn State's Materials Research Laboratory, had previously collaborated with NEC Corp in Japan in developing the rectangular piezoelectric transformers currently in use in the company's notebooks. However, he says that the circular wafers promise increased efficiency and higher conversion ratios.
Conventional electromechanical transformers are big, very heavy and produce a...
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