Compact Lightweight Power Amplifier for Piezoelectric Actuators

摘要

Existing power amplifier concepts for driving piezoelectric actuators are characterized by a conflict of objectives. Excellent signal quality can only be achieved by means of analogue amplifiers, while low-loss supply and recovery of field energy can only be accomplished with the aid of switching amplifiers [1]. This paper introduces an innovative analogue circuit concept that offers all familiar advantages of analogue circuitry and, at the same time, transforms the field energy in such a way that loss is reduced and a high degree of efficiency is achieved. With a correspondingly high degree of integration the small size of a switching amplifier can be reached or even undercut.