Title page for ETD etd-71898-95410


Type of Document Master's Thesis
Author Luan, Jiyuan
Author's Email Address jluan@vt.edu
URN etd-71898-95410
Title Design and Development of High-Frequency Switching Amplifiers Used for Smart Material Actuators With Current Mode Control
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Lee, Fred C. Committee Chair
Hua, Guichao Committee Member
Lai, Jason Committee Member
Keywords
  • Current Mode Control
  • Electrostrictive Actuator
  • Piezoelectric Actuator
  • Smart Material
  • Switching Amplifier
Date of Defense 1998-07-29
Availability unrestricted
Abstract
This thesis presents the design and development of

two switching amplifiers used to drive the so-called

smart material actuators. Different from conventional

circuits, a smart material actuator is ordinarily a

highly capacitive load. Its capacitance is non-linear

and its strain is hysteretic with respect to its

electrical control signal. This actuator's reactive

load property usually causes a large portion of reactive

power circulating between the power amplifier and the

driven actuator, thus reduces the circuit efficiency

in a linear power amplifier scenario. In this thesis,

a switching amplifier design based on the PWM technique

is proposed to develop a highly efficient power

amplifier, and peak current mode control is proposed

to reduce the actuator's hysteretic behavior. Since

the low frequency current loop gain tends to be low

due to the circuit's capacitive load, average current

mode control is further proposed to boost the low

frequency current loop gain and improve the amplifier's

low frequency performance. Both of the circuits have

been verified by prototype design and their experimental

measurement results are given.

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