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Improved charge amplifier using hybrid hysteresis compensation.

Darya Amin-Shahidi1, David L Trumper

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Summary
This summary is machine-generated.

This study introduces a new charge amplifier with a robust feedback circuit and a hybrid method to reduce piezoelectric actuator hysteresis at low frequencies, enhancing performance in demanding applications.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Control Systems

Background:

  • Piezoelectric actuators are widely used but exhibit hysteresis, complicating precise control.
  • Existing charge amplifiers can be sensitive to load impedance, limiting their application in systems with cabling.
  • Low-frequency hysteresis in piezoelectric actuators poses significant challenges for accurate positioning and force control.

Purpose of the Study:

  • To develop a novel charge amplifier with enhanced robustness to series load impedance.
  • To introduce a hybrid method for compensating piezoelectric actuator hysteresis at low frequencies.
  • To demonstrate the practical utility and performance improvements of the proposed charge amplifier design.

Main Methods:

  • A modified feedback circuit was designed to improve robustness against series load impedance.
  • A hybrid hysteresis compensation method was developed, integrating feedforward and feedback control strategies.
  • Experimental validation was performed using a piezoelectric actuator system to assess performance.

Main Results:

  • The modified feedback circuit demonstrated improved robustness to added series load impedance.
  • The hybrid compensation method effectively reduced low-frequency hysteresis in the piezoelectric actuator.
  • Experimental results confirmed the practical utility and enhanced performance of the novel charge amplifier.

Conclusions:

  • The novel charge amplifier design offers improved robustness and effective low-frequency hysteresis compensation for piezoelectric actuators.
  • The developed hybrid compensation method is suitable for real-time control applications requiring precise actuator positioning.
  • This work contributes to the advancement of high-performance control systems utilizing piezoelectric actuators.