Patent ID: 6465933
Filing Date: 2002-10-15
Classification: H01L,H02N

Abstract:
A method for adding damping to a piezoelectric positioner by electronic means, comprising the steps of:(a) applying a control voltage driving said piezoelectric positioner to control a physical position of said piezoelectric positioner, and (b) producing a first voltage proportional to the total current passing through said piezoelectric positioner in response to said control voltage, and (c) producing a second voltage proportional to the current passing through the static capacitance portion of said piezoelectric positioner in response to said control voltage, and (d) subtracting said second voltage from said first voltage to produce a third voltage proportional to the current passing through the dynamic impedance portion of said piezoelectric positioner impedance, and (e) amplifying or attenuating said third voltage to obtain the desired degree of damping, and (f) subtracting said amplified or attenuated third voltage from said control voltage applied to said piezoelectric positioner, whereby a negative feedback effect is produced for the current flowing through said dynamic impedance thereby producing the effect of damping added to said piezoelectric positioner.