A Simple DC Electronic Load

This paper introduces the design of a simple DC electronic load by single-chip microcomputer of C8051F020.The electronic load is beads on a constant current mode.Constant current controls NMOS tube circuit to generate a constant current with DA on the MCU.When voltage supplied by the DC power changes within a certain range,the current going through the DC electronic load is a constant.In the constant current mode,setting current is very accurate.When the terminal voltage off Electronic load changes 10V,the changing value of output current can be controlled less than 0.9%.Overvoltage protection volt age is about 18V。Meanwhile,the simple DC electronic load can work in the constant resistance mode.