Piezo actuator driving circuit

Abstract

The present invention relates to a piezo actuator driving circuit. The piezo actuator driving circuit includes a pulse generator that generates a first voltage pulse with a constant period; a first driver stage that receives the first voltage pulse of the pulse generator and buffers the first voltage pulse to output; a second driver stage that converts the first voltage pulse, buffered and output in the first driver stage, into a first current pulse to output; a driving voltage maintaining section that is connected to the pulse generator and the second driver stage so as to output a second current pulse for maintaining a constant amplitude of driving voltage pulse; and a piezo actuator that is connected to the second driver stage and the driving voltage maintaining section so as to be charged and discharged by the first and second current pulses and that is driven by the driving voltage pulse with a constant amplitude.

Description

[0001] Related Application Cross Reference [0002] This application claims priority from Korean Patent Application No. 2005-0062052 filed with the Korean Industrial Property Office on Jul. 11, 2005, the disclosures of which are incorporated herein by reference. technical field [0003] The present invention relates to a piezoelectric actuator driving circuit, and more particularly, to a piezoelectric actuator driving circuit capable of preventing signal distortion caused by processing deviation or temperature variation when manufacturing a piezoelectric actuator , and it is possible to maintain the driving voltage by additionally transmitting current pulses to the driving voltage holding portion of the piezoelectric actuator to prevent the piezoelectric actuator from malfunctioning or stopping. Background technique [0004] At present, the mobile phone market is growing rapidly at a rate of more than 20% every year. Recently, there has been a demand for the development of ...

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