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As a simulation exercise, I am trying to work out a power supply and actually I am at the point provided in the figure below

enter image description here

There is a message of error which I don't understand, but I realized it happens only with the presence of the diode in the circuit.

In fact, in order to understand this, I did two other attempts: a separate circuit on the right with a diode which works fine and a short circuit around the diode itself which is reported in the next figure

enter image description here

and still it works fine.

So the question is: which is the problem with adding that diode in the circuit?

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There is a warning message relating to the fact that you have the secondary of Tr1 (the transformer) floating. It would be better to ground one side for the purposes of simulation.

I don't see an error message.

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  • \$\begingroup\$ it works! Still I don't understand the reason for which if no diodes is present than it could work even without a ground attached at the secondary coil, while the ground became necessary once one diode is present there... \$\endgroup\$
    – Stefano Fedele
    Commented Jan 4, 2021 at 8:41

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