Design of constant current electronic load system based on MSP430F149

A simple DC electronic load of constant current working-mode is designed by this system.This system use MSP430F149 MCU as the core and via A/D collects current which is measured by current detection module meanwhile the V/I conversion circuit is controlled by D/A output module with PID processing algorithm.When the system is working,no matter whether the voltage of electronic load is changed,the current through the electronic load is constant value which is set by user.The practical application shows,this system has important application significance of constant current electronic load.