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If you have ever worked with Batteries, SMPS circuits or other Power supply circuits, then often it would have occurred that you have to test your power source by loading it to check how it performs under different loading conditions. A device that is commonly used to perform this type of test is called a Constant Current DC Load, which allows us to adjust the output current of your power source and then keeps it constant until it is adjusted again changes. In this tutorial, we will learn how to build our very own Adjustable Electronic Load using Arduino, which can take a maximum input voltage of 24V and drain current as high as 5A. For this project, we have used PCB boards which are manufactured by AllPCB, a china based professional PCB manufacturing and assembling service provider.
In our previous voltage-controlled current source tutorial, we have explained how to use an operational amplifier with a MOSFET and make use of a voltage-controlled current source circuit. But in this tutorial, we will apply that circuit and make a digitally controlled current source. Obviously, A digitally controlled current source requires a digital circuit and to serve the purpose, an Arduino NANO is used. The Arduino NANO will provide required controls for the DC load.
The circuit consists of three parts. The first part is the Arduino Nano section, the second part is the digital to analog converter, and the third part is a pure analog circuit where a dual operational amplifier in a single package is used which will control the load section. This project is inspired by a post on Arduino, however, the circuit is changed for less complexity with basic features for everyone to build it.
Our Electronic load is designed to have the following input and output sections.
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