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Convergence problems in TINA high voltage design

Ronny Thomsen
Prodigy 150 points

Hello,

I cant seem to get this attached TINA schematic file to work, i.e to converge. I have tried all the pre-defined PRM (Parameter) files.

Can you please helt me ?

I have attached the TINA schematics file.

Best regards

RonnyAC voltage limiter.TSC 

  • 0
    Prodigy 5 points

    Hello Ronny,

    Thank you for posting.
    I tried your TSC file and indeed diode D1 fails for not being able to converge.
    I can not find the cause for this after experimenting with your circuit.

    This would be a question for DesignSoft/TINA. 
    Please use this support page: www.tina.com/technical-support/

  • 0 in reply to Ed Walker
    Prodigy 150 points

    OK, thansk for you effort.

    I have sent a message to the TINA support via the link you sent me. I really hope they can solve my problem..

    Best regards,

    Ronny

  • 0 in reply to Ronny Thomsen
    Prodigy 5 points

    Hello Ronny,

    I have experimented with your circuit some more and still are baffled by the non-convergence problem.

    If you would, please reply when you get some help from DesignSoft and what the resolution was.
    This will help others when the TI Forum is searched for the same problem.

  • 0 in reply to Ed Walker
    Prodigy 150 points

    Hi,

    Well.. I actually got an answer from TINA support and it all depends on my output load model. If you remove this and insetad places a simple resistor as load the circuits simulated fine.

    However, I really want to simulate with a constant power load since this will be the case in real life so it would be great if the constant power load could then be simulated in some other way.

    Best regards

    Ronny

  • 0 in reply to Ronny Thomsen
    Prodigy 5 points

    Interesting Ronny,

    It sounds very similar to reality.
    When I was testing supplies on the bench, I found a normal switcher would not start up if my electronic loads were set to Constant current, or Constant power.
    This is because, when the output is just coming up, the voltage is very low so the constant P or I load would try and pull so much current that the supply would see this as an output short and start crowbar action.

    To remedy this I would bring up the supply in Constant resistance, then after the output is regulating I could switch over to Constant I or P.

    Perhaps you could enable the Constant power load, with a timed switch or some other means, after the simulation has achieved a stable operating point.

    Thank you for the reply.

  • 0 in reply to Ed Walker
    Prodigy 150 points

    Yes, that is of course correct.. I havn't though about the initial mathematical conditions and the resulting very large calculated current..

    I will try to implement a timed switch, or a voltage controlled switch that will enable the constant power load as you described first when the output voltage has come up to a certain min level that will not result in an excessive load current.

    Many thanks!

    Best regards

    Ronny