Design of Constant Current Electronic Load Base on STM32

Abstract

In order to improve the utilization efficiency of the electrical laboratory and reduce the experimental cost, the paper designs the adjustable constant current electronic load. The single-chip digital port reads the current reference value and sample load current controller with reference value of 12 bit DAC chip; using general operational amplifier to realize PID regulator, to realize constant current and overvoltage protection circuit using selective control simulation. The electronic load can realize the constant current load mode, and has the functions of over voltage protection, keyboard input, digital display, complete function and low cost. The DC current stability of the prototype is close to 99%, and the stability of the AC constant current is 99.8%.