CIRCUIT FOR CONTROLLING FEEDBACK CURRENT OF PIEZOCERAMIC ACTUATOR OF PIEZOELECTRIC CERAMIC ACTUATOR

摘要

The present invention relates to a circuit for controlling a voltage applied to a piezoelectric ceramic actuator (2), comprising: a piezoelectric ceramic actuator (2) changing a length corresponding to an input current amount; A current-to-voltage converter (6) for changing the current supplied to the actuator (2) to a voltage; An integrator (3) for integrating and outputting the voltage of the current-to-voltage converter (3); A subtracter (1) for subtracting the output voltage of the integrator (3) from a control voltage for controlling the length of the actuator and outputting the subtracted output voltage; And a voltage feedback amplifier (4) for amplifying the output voltage of the subtracter (1) and applying the amplified voltage to the actuator (2).;That is, since the voltage applied to the actuator is controlled according to the amount of electric charge applied to the actuator, the piezoelectric ceramic actuator can be precisely controlled.