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Proceedings Paper

Piezoelectric actuation systems: optimization of driving electronics
Author(s): David V. Newton; John A. Main; Ephrahim Garcia; Lloyd Massengill
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Paper Abstract

Voltage control is by far the most common strategy for driving piezoelectric actuators, but it is, at times, handicapped by large, inefficient amplifiers and nonlinear piezoelectric actuator behavior. Optimizing voltage-feedback amplifiers for driving capacitive-type loads with amplifier schemes such as pulse-width-modulation promises to drastically reduce amplifier weight and improve efficiency. This development work is currently in progress and is discussed in this paper. Also presented are some methods that take advantage of direct charge control of piezoelectric actuators. Direct charge control removes much of the hysteresis that is inherent in voltage control so it is a likely option if a high level of positioning accuracy is needed in a given application. Unlike voltage-feedback control, charge amplifiers can accurately control a piezoactuator open loop. The main drawback to charge control is that periodic removal of charge bias is necessary to prevent actuator drift. Discussed are strategies that attempt to accomplish charge control while simultaneously avoiding actuator drift and conserving power.

Paper Details

Date Published: 1 May 1996
PDF: 8 pages
Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); doi: 10.1117/12.239029
Show Author Affiliations
David V. Newton, Garman Systems, Inc. (United States)
John A. Main, Univ. of Maine (United States)
Ephrahim Garcia, Vanderbilt Univ. (United States)
Lloyd Massengill, Vanderbilt Univ. (United States)

Published in SPIE Proceedings Vol. 2717:
Smart Structures and Materials 1996: Smart Structures and Integrated Systems
Inderjit Chopra, Editor(s)

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