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Development of dual-mode precision current source for macro-microcomposite actuator based on field programmable gate

Chuanli Wang1, Meijun Xiong1, Caofeng Yu1

  • 1School of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China.

The Review of Scientific Instruments
|July 10, 2021
PubMed
Summary
This summary is machine-generated.

A novel dual-mode precise programmable current source was developed using a field-programmable gate array (FPGA). This system precisely controls macro-microcomposite actuators, achieving high linearity and low error for advanced applications.

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Area of Science:

  • Electrical Engineering
  • Control Systems Engineering
  • Materials Science

Background:

  • Macro-microcomposite actuators, combining voice coil motors and giant magnetostrictive actuators, require precise current control.
  • Existing current sources face challenges with variable input, microstep adjustment, linearity, and ripple.

Purpose of the Study:

  • To design and implement a dual-mode precise programmable current source for macro-microcomposite actuators.
  • To achieve high output linearity, low error, and minimal ripple in the actuator's driving current.

Main Methods:

  • Developed a circuit system model based on the operational amplifier principle.
  • Designed a current switching circuit and a dual-mode current sampling circuit.
  • Utilized a field-programmable gate array (FPGA) as the control core with an incremental PI algorithm for feedback compensation.

Main Results:

  • The FPGA-controlled current source demonstrated two output modes: 0-5 A and -5 to 5 A.
  • Achieved an average current error coefficient (ε) ≤ 0.006.
  • Attained a maximum nonlinearity (ηmax) ≤ 0.005 and a step value error < 1%.

Conclusions:

  • The proposed dual-mode precise programmable current source effectively meets the demanding requirements of macro-microcomposite actuators.
  • The FPGA-based control system offers high precision, linearity, and stability for actuator applications.
  • This design enables advanced control for systems utilizing combined voice coil and giant magnetostrictive actuation.