Charge driven piezoelectric transducers in self-sensing configuration

摘要

The aim of the present paper is to illustrate the configuration and the performances of a charge feedback amplifier to drive a piezoelectric transducer in self-sensing operation, i.e. to use the same transducer as sensor and actuator at the same time. A suitable balancing procedure of the self-sensing circuit allows to obtain an output signal proportional to the displacement of the mechanical structure. Experimental tests show that the proposed charge feedback amplifier simplifies the balancing procedures needed to obtain a useful output signal from the self-sensing readout circuit, this is attributed to the increased stability of the electric parameters of the piezoelectric that can be achieved with charge control.