Battery simulator

To design a battery charger with switching regulators you need quite a few flat batteries and the patience of Job. When you come to calibrate the circuits or accuracy, control and efficiency you need a constant load. unfortunately, the terminal voltage of a battery is never very stable. On top of that difficulty you have to be careful not to overload either the charger or the battery. The simulator described in this article provides a load that remains constant for long periods of time.