Scheme design and experimental verification of programmable current source for giant magnetostrictive actuator based on field programmable gate array

Abstract

In order to meet the requirements of a giant magnetostrictive actuator for a microstep, high precision, and wide range of input power supply, a design scheme of the high performance programmable current source based on a field programmable gate array processor and the OPA549 amplifier is proposed. Based on the circuit principle of the microstepping continuous adjustment current source, the microstepping control circuit and the constant current source control circuit are designed and the feasibility of the design scheme is verified by circuit simulation and experimental test. The results show that the current output range of the programmable current source is 0 A–6.99 A and the minimum step value is 1.7 mA. The output current precision can reach 1.10% in circuit simulation and 4.38% in experimental test. The research results show that the proposed design scheme of the programmable current source satisfies the requirements of the giant magnetostrictive actuator.