Research on high-precision constant current source technology based on operational amplifiers
Minghui Liu, Panhui Chen, Min Cong Zhu, Yanru Ren, Qiao Peng · IET conference proceedings. · 2025
A constant current source is a power supply capable of providing controllable and stable current to a load, with the core component being the constant current circuit. Addressing the design challenges of constant current circuits for small specialized devices, this paper introduced two typical constant current circuits based on operational amplifiers (Op-Amps) and analyzed the practical issues encountered during their application. To address these issues, the paper proposed improvement strategies for the two circuits. To validate the usability of the circuits, simulations and analyses were conducted using a simulation software Multisim, and constructed the high-precision constant current circuit experimental system with multiple operational amplifier feedback loops. Simulation resulted demonstrate the stability and usability of the improved constant current circuits, offering valuable references for the design and application of constant current circuits in small specialized devices.