This is a follow-up post to my previous project page Part 5 (PC software).
This is the last post concerning this project. I have done some tests with the final hardware and software. Furthermore I have written a small conclusion to this project.
An interesting test is the transient response on a sudden change of the setpoint current. In this case I stepped the setpoint current from 2 A to 0 A. The following picture shows the voltage across the shunt. You can see a voltage drop of 200 mV (corresponding to 2 A) within a time span of around 20 ms. The time could be reduced by decreasing C18 and C21 in the schematic. The latter one should be adjusted carefully because a too small capacitor may destabilise the control loop.