Parallel driving of piezoelectric transformers has been
studied to increase output power, and output characteristics
of multiple piezoelectric transformers that are driven in
parallel from 2 to 5 have been compared to those of a
single transformer. The voltage step-up ratio increased in
proportion to the parallel connection number, n, but the rate
of increase decreased gradually, so there was little increase
with driving over 5 piezoelectric transformers in parallel. The
relative efficiency showed a maximum value of 1.06 with n of
2 and a minimum value of 0.75 with n of 5. The output
power increased continuously according to the parallel
connection number, but the relative output power per
transformer gave a value of 1.015 with n of 2 and decreased
to below 1.0 with greater n, so n of 5 gave a value of
0.75.
Abstract:In this paper, Pb(Mn 1/3 Nb 2/3 ) 0.07 (Ni 1/3 Nb 2/3 ) 0.10 (Zr 0.5 Ti 0.5 ) 0.83 O 3 ceramics were fabricated by the conventional solid state method to obtain excellent dielectric properties for ultrasonic generators. The effects of 2nd calcination temperature on their microstructure and piezoelectric properties were systematically investigated. The tetragonality increased in the ceramics when 2nd calcination temperature increased to the optimized temperature at 750℃. At that temperature, excellent physical properties (d 33 = 352 pC/N, ε r = 1,687, k p = 0.570, Q m = 1,640) were obtained for ultrasonic generator application.
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