RLC circuit with diode

• Shortcut diode:
  • all components including Diode in MSL
  • implementation uses standard "s trick"

    • off = s < 0;
      v = if off then s else 0;
      i = if off then 0 else s;

  • variable s is curve parameter along characteristic
• Shockley diode:
  • easily implemented using a partial model from MSL
  • piecewise linear interpolated approximation
    • mainly graphically with LookupTable and VoltageSensor from MSL
• “Real-time” variant:
  • replace characteristic equation by its derivative
    • → reduces DAE to ODE (at least for simplified total model)
  • here: i = 0 remains in diode component
  • diode switches from locking to conducting phase
    • → i changes from algebraic to state variable
    • works in MapleSim, not in Dymola
  • workaround: use der(i) = 0 instead