Piezoelectric transformer using energy trapping of width-shear vibration in LiNbO/sub 3/ plate

Piezoelectric micro-transformer based on PZT unimorph membrane

“…The functioning principle remains strictly the same as for macroscopic size piezoelectric transformers [2,3], namely, it is based on a double electromechanical conversion (reverses piezoelectric effect) then mechanical electric (direct piezoelectric effect) of energy. Indeed, a piezoelectric transformer is made of piezoelectric material on which two primary and two secondary electrodes are placed.…”

Radio frequency (10–23 MHz)-assisted excitation of a microdischarge with a piezoelectric transformer

“…Transformers employing ceramic piezoelectric materials were first described by Rosen et al in 1958 [8]. Subsequently, LiNbO 3 -based piezoelectric transformers were demonstrated [9][10][11][12][13] and, despite the introduction of complex geometries to better utilize the properties of the crystal, these devices typically operated at or below frequencies of a few megahertz. Recently, Zimnicki and Mattson [14] reported a novel LiNbO 3 resonant transformer design, employing 1-2 mm thick crystals in a simple parallelplate contact geometry and operating at ∼1 MHz.…”

High power multi-output piezoelectric transformers

“…From (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) and (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18), the mechanical vibration equations can be expressed in the following form…”

“…But £ 0 decreases with increasing the length and become saturated after the length reaches a certain value when R x is constant. From equation (5-17a),(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23) and(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24), it can be concluded that the equivalent mass m e increases and equivalent inductance L decreases with increasing the length, and the increase of m e and decrease of I induces the decrease of displacement of input section £ 0 when the load resistance and other dimensions are constant. But this influence will be counteracted by the decrease of impedance Z/ when the load resistance is matched.…”