Thyristor SCR test circuit

Hello

Attached a simple test for a thyristor (SCR) circuit.

Normally, this circuit should work for a 106D TIC, but it doesn't. (Even tried with 'real' components. Light starts to burn without pressing the switch 2. The lamp, we used was a 230V/10W halogen bulb).

I replaced the TIC106D with a BT150-500R in Multisim, but same result/problem.

Could someone tell me what is wrong and what to do to do things?

Kind regards

Daniel

Hello Daniel,.

It is indeed correct that the warning lamp burning if you open J1 and J2 closed to leave.

The reason why I can't get this, was because you use the same shortcut keyboard (space) for two switches.

In general, this is done when both switches are controlled by the same entries.

I see that there are several changes in the schema. (eg. placement of the thyristor also changed)

The lamp of 10W or 5W (10W, said schema 5W said forum post)?

If you want to have the switch J1 to actually turn off the lamp when you turn off the power, then there is something you missed.

No matter what source of power (no matter if it can be disabled or not) on a schema must always have a discharge capacity.

This discharge capacity should provide a path of the soruce to the ground.

If you do not include this, then the source of voltage (according to diagram) is not properly off.

As an attachment, there is an example of how you could do that.

In practice this might not always necessary, but it is always a good practice with custom designs.

In the simulation, you should always check that it has a way of discharge when you encounter these issues.

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