Simulink Problem: Derivative input is Inf

Hi,

I face a Simulink problem at the input of the integration block, which is:

Derivative input 1 of 'diode4_1_test/Integrator' at time 0.00050002112037682831 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)

However,the input of the integration block is not infinity according the scope. I also tried to put saturation block at the input, but the problem also exists.

Thank you!

[Jordan Monthei]

It would be helpful to see what sort of system you are trying to run as well as what is seen on the scope to have a better understanding of your problem.

Answer 1

[Guy Rouleau]

Use the Simulink debugger to identify where the Inf or NaN originates. There is a "NaN" breakpoint.

[Fan]

Thank you!

Answer 2

[Brahim MOUDOUD]

Hi,

I had the same problem for the integrator

Derivative of state '1' in block '..../integrator' at time 4.4501477170144018E-309 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)

Thank you .