Hi everyone,

I want to develop a soft start system for the receiver. In real system, it is a power supply in the laboratory with a variable resistance value - hence programming the resistance R3 as a variable value determined by the voltage source.

The system to perform a soft start for the receiver, which causes a large current peak when switching on the voltage, is based on a triac, i.e. when the triac sees that the current flowing to R3 is 12A, it cuts off the sine wave at this point, which makes that the intensity will never reach a greater value.

Besides the soft start model, I am attaching the contents of trctriac.lib and TRIAC_Teccor.asy which I have implemented into the circuit in the form of a triac element.

Please help me develop an algorithm for setting the changeable angle. I thought about defining angle alpha using the arcus function, e.g. atan(I(R3))=12, but that was beyond my skills.

Best regards,
Anna

 

This looks like a Homework assignment.

I wouldn't do it this way, simply because Triacs are so NOISY.
( but they can be cheap and effective )

It doesn't look like you've tried to come up with a solution.
Try looking at how a cheap "Light-Dimmer" works.
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i.e. when the triac sees that the current flowing to R3 is 12A, it cuts off the sine wave at this point

Unfortunately, triacs don't work like that.
Once the triac is ON it remains ON until the end of the half-cycle.