High Stability Output Current Control Method of Current Source

In order to solve the problem of accuracy and stability of power type programmed high stable current source, this paper presents a high stable current source and its control method. Firstly, the main circuit topology and its component selection of current supply are introduced, which consists of high frequency isolated rectifier and H-bridge inverter. Secondly, the output current closed-loop and virtual impedance control strategy are adopted, combined with current command temperature drift correction technology. The current command increases as the ambient temperature increases to compensate for the temperature drift of the acquisition circuit, which can increase the stability of the current source over the full temperature range by more than 5 times. Finally, the correctness of the topology and component selection of the high stability power supply and the feasibility of the control method are verified by simulation and experiment, which has good application value.