A series RL circuit is connected to a voltage source for a very long time and passes 1A constant current.¨
All of a sudden a switch between the voltage source and the RL circuit is opened and the circuit is let alone with its natural response as below switch 1 to switch 2:
I wanted to illustrate this by using LTspice. So I set the initial current for the inductor as 1A and used the built-in switch component in LTspice as follows:
The current I(L2) in the above plot is exactly how we predict in real life and obeys the first order differential equation solution ect.
The inductor Vl's behaviour above is also how we would predict as it starts from a negative voltage and ends up as zero, as a back-emf.
But as a value it does not represent the real life measurements. In real life the back-emf voltage would never go that much as -1GV. I tried to tweak some parameters of the switch but failed to reduce the back-emf voltage in the simulation. Obviously something is missing which exists in real life (?)
What could be added or adjusted so that this switch causes more realistic back-emf?