Home Forums Bug Reports Unphysical behavior of transformers

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  • #8553
    74442PPOE
    Participant

      Hello, thanks for the tool, I’m very impressed by its capabilities. I’ve tried to simulate mixed signal circuit using ideal transformer models and I’ve found it I don’t get DC voltage to my transistors at VCC. I started to investigate and found it that transformer models don’t seem to differentiate between AC and DC signals correctly.

      As shown in the attached picture, I feed DC voltage into coil and I’m not getting the same value at Pr1, however, I get the same DC voltage at Pr3. I however, get nothing on Pr1 where I was expecting to see 12V.

      Furthermore, if I increase T to 2, I get 24V on Pr3, meaning that simulation treats it as AC circuit.

      However, I found a way to correct this bug by cutting out transformer (CTRL+X) and pasting back at the exact same spot (CTRL+V). After that, I get the correct behavior. Still, I don’t know know how to tell if the transformer will act correctly or not.

      #8557
      tomhajjar
      Participant

        Ideal transformer not right. Use transformer made up of mutual inductors instead.

        You should never float nodes either. Voltage probe has infinite input Z.

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