Unable to resolve the error of convergence

I have a thermostat to diode based using a 1N4148 as reverse engineering temperature sensor.

I entered the circuit in the schematic editor, but whatever I do, he refuses to perform the simulation!  I get an immediate "Timestep too small" simulation error, and the assistance of convergence can not solve.

I don't * think * I have all "stupid" that would cause the simulation to fail, but maybe I've missed something obvious.

As a "Starter for 10 points" How can I get the simulation to run?

As a '30-point Bonus question' how can I change the temperature of the led (say) 150C while leaving the rest of the simulation at nominal temperature?

Hello

We use a better model for the LM324N SPICE:

  • Double-click this component (U3A) to open its Properties.

  • Select the value and click the replace button.

  • Make sure the LM324N is selected in the browser pane.

  • Visit the Model FAB/ID field and select the model of National Semiconductor National (it is a model of 5 pins, more precision).

  • Click OK, select the section.

  • Repeat this procedure for the section B, C and D.

Run the simulation, this convergence error should disappear. I have attached your circuit with this change.

I hope this helps.
Fernando

Tags: NI Software

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