DRIVE DEVICE AND DRIVE DEVICE CONTROL METHOD

摘要

A drive device (12) is provided with: an output voltage-resolving unit (1221) for resolving output voltage to an ultrasonic transducer into a base component and higher harmonic components; an output current-resolving unit (1222) for resolving output current flowing to the ultrasonic transducer into a base component and higher harmonic components; a Cb current-calculating unit (1223) for calculating the base component and higher harmonic components of a Cb current on the basis of the output voltage base component and higher harmonic components; a drive current-calculating unit (1224) for calculating the base component and higher harmonic components of a drive current for the ultrasonic transducer on the basis of the base component and higher harmonic components of the output current and the base component and higher harmonic components of the Cb current; a drive current-summing unit (1226) for summing the base component and the higher harmonic components of the drive current; and a constant current control unit (1227) for generating constant current control data so that the summed drive current reaches a target value.