Patent ID: 9070856
Filing Date: 2015-06-30
Classification: B06B,H01L

Abstract:
1. A method for driving an electrostrictive or magnetostrictive transducer, comprising: applying an amplifier output voltage across said transducer; processing a feedback signal from said transducer to determine amplitude and phase characteristics of said feedback signal; using the determined amplitude and phase characteristics to calculate a motional voltage of a transducer equivalent circuit having capacitive, inductive and resistive components, the calculating of the motional voltage including subtracting a voltage drop across a static capacitor of the transducer equivalent circuit as a function of load and maintaining constant a theoretical voltage across motion components of the transducer equivalent circuit; modifying said output voltage by the calculated value of said motional voltage; and feeding a current to said transducer in an amount to maintain the voltage drop across said transducer at the modified value of said output voltage.