Charge-recovery power amplifier for piezoelectric applications

John A. Main

doi:10.1117/12.275698

6 June 1997 Charge-recovery power amplifier for piezoelectric applications

John A. Main

Proceedings Volume 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems; (1997) https://doi.org/10.1117/12.275698
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

Abstract

A power amplifier concept that considers both the electrical and mechanical nature of piezoelectric actuators is presented in this paper. It is referred to as a charge-recovery amplifier because it is designed to recover during actuator contraction the energy that is stored in the electric field of the actuator during extension. This is accomplished by creating a closed system with a flying capacitor that can be switched from a parallel configuration to a series configuration, effectively trapping the electric charge in the closed system and moving it between the piezoelectric actuator and the capacitor. Desired deflection levels within the range of the actuator are accomplished by switching the system at a high rate and using a pulse-width-modulation strategy.

Citation Download Citation

John A. Main "Charge-recovery power amplifier for piezoelectric applications", Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); https://doi.org/10.1117/12.275698

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