Abstract
The voltage transformation behavior is obtained at unloaded condition in the piezoelect- ric transformers (PTs) for two different designs. One design involves disk-type (cylindrical shape) single-layer (piece) piezoelectric material, and another design involves two-layer rectangular-type piezoelectric materials. Each of these piezoelectric transformers possesses three terminals of which one terminal being common between the input pair of terminals and the output pair of terminals. The cylindrical disk-type PT is unipoled and designed with varying geometry of the electrode areas used as input and output terminals. The rectangular-type PT consists of two piezoelectric layers having each layer separately poled and designed with uniform thickness and rectangular electrode area. The disk PT has a ring electrode area (A R ) and a dot electrode area (A D ) on the same face used as input and output terminals. The common terminal has a full-face electrode on the opposite face. The ratio of the output dot electrode area to the input ring electrode area (A D /A R ) for the output voltage (V out = V D ) measured at the dot terminal and input voltage (V in = V R ) supplied at the ring terminal indicates leakage effect of the device attributing to the unelectroded region of the unipoled PTs. The same leakage effect is observed in the case of the reverse voltage transformation having switching input and output terminals (i.e., V in = V D and V out = V R such that A R /A D becomes the electrode area ratio). In both the cases (i.e., switching input and output terminals) of the voltage transformation the unipoled PTs exhibited step-up response except for the transformation factor. The results are presented in the form of output voltage as a function of applied frequency at fixed input voltage. The time dependence of the maximum output voltage corresponding to the peak applied frequency appears to exhibit transient response for the disk and rectangular PTs. Both step-up and step-down responses are noted for the rectangular PTs. *Present address of Ravindra B. Lal, Exploration Science and Technology Division, NASA-MSFC, Huntsville, AL 35812, USA.
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