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Analog.Examples.ShowVariableResistor.md

Analog.Examples.ShowVariableResistor ​

MSL validation test: ShowVariableResistor.

Recreates Modelica.Electrical.Analog.Examples.ShowVariableResistor from MSL v4.0.0. A sine voltage source drives two parallel branches: a fixed 3-resistor chain (R1-R2-R3, each 1 Ohm) and a variable-resistor chain (R4-VR-R5). The variable resistor's value is swept by a ramp from 2 to 7 Ohm over 2 s. The VariableResistor branch should be compared with R2 in the fixed branch.

MSL reference: tolerance=1e-6, StopTime=1.

Usage ​

ElectricalComponents.Analog.Examples.ShowVariableResistor()

Behavior ​

julia
using ElectricalComponents #hide
using ModelingToolkit #hide
@named sys = ElectricalComponents.Analog.Examples.ShowVariableResistor() #hide
full_equations(sys) #hide
<< @example-block not executed in draft mode >>

Source ​

dyad
"""
MSL validation test: ShowVariableResistor.

Recreates `Modelica.Electrical.Analog.Examples.ShowVariableResistor` from MSL v4.0.0.
A sine voltage source drives two parallel branches: a fixed 3-resistor chain
(R1-R2-R3, each 1 Ohm) and a variable-resistor chain (R4-VR-R5).
The variable resistor's value is swept by a ramp from 2 to 7 Ohm over 2 s.
The VariableResistor branch should be compared with R2 in the fixed branch.

MSL reference: tolerance=1e-6, StopTime=1.
"""
example component ShowVariableResistor
  "Sine voltage source: V=1 V, f=1 Hz"
  sine = BlockComponents.Sources.Sine(amplitude = 1, frequency = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 20, "y1": 20, "x2": 120, "y2": 120, "rot": 0}
      },
      "tags": []
    }
  }
  "Voltage source driven by the sine signal"
  voltage_source = ElectricalComponents.Analog.Sources.VoltageSource() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 100, "y1": 230, "x2": 200, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  "Ground at source negative terminal"
  ground1 = ElectricalComponents.Analog.Basic.Ground() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 10, "y1": 660, "x2": 110, "y2": 760, "rot": 0}
      },
      "tags": []
    }
  }
  "Ground at return path (right side)"
  ground2 = ElectricalComponents.Analog.Basic.Ground() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 900, "y1": 690, "x2": 1000, "y2": 790, "rot": 0}
      },
      "tags": []
    }
  }
  "Fixed resistor chain (top branch)"
  R1 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 300, "y1": 230, "x2": 400, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  R2 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 500, "y1": 230, "x2": 600, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  R3 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 700, "y1": 230, "x2": 800, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  "Variable resistor chain (bottom branch)"
  R4 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 290, "y1": 530, "x2": 390, "y2": 630, "rot": 0}
      },
      "tags": []
    }
  }
  variable_resistor = ElectricalComponents.Analog.Basic.VariableResistor() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 500, "y1": 530, "x2": 600, "y2": 630, "rot": 0}
      },
      "tags": []
    }
  }
  R5 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 700, "y1": 530, "x2": 800, "y2": 630, "rot": 0}
      },
      "tags": []
    }
  }
  "Ramp signal for variable resistance: offset=2, height=5, duration=2 s"
  ramp = BlockComponents.Sources.Ramp(height = 5, offset = 2, duration = 2) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 380, "y1": 370, "x2": 480, "y2": 470, "rot": 0}
      },
      "tags": []
    }
  }
  "Fixed temperature to ground the thermal port (alpha=0, so T is irrelevant)"
  fixed_temp = ThermalComponents.Sources.FixedTemperature(T = 300.15) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 320, "y1": 740, "x2": 420, "y2": 840, "rot": 0}
      },
      "tags": []
    }
  }
relations
  guess variable_resistor.i = 0
  "Signal to voltage source"
  connect(sine.y, voltage_source.V) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 150, "y": 70}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Source positive to ground1 (matches MSL SineVoltage1.p -> Ground1)"
  connect(voltage_source.p, ground1.g) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 60, "y": 280}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Source negative to both branches (matches MSL SineVoltage1.n -> R1.p, R4.p)"
  connect(voltage_source.n, R1.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(voltage_source.n, R4.p) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 270, "y": 280}, {"x": 270, "y": 580}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Top branch: R1 -> R2 -> R3 -> ground2"
  connect(R1.n, R2.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(R2.n, R3.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(R3.n, ground2.g) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 950, "y": 280}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Bottom branch: R4 -> VR -> R5 -> ground2"
  connect(R4.n, variable_resistor.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(R5.n, ground2.g) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 950, "y": 580}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  connect(variable_resistor.n, R5.p) {"Dyad": {"renderStyle": "standard", "edges": [{"S": 1, "E": 2, "M": []}]}}
  connect(ramp.y, variable_resistor.R) {
    "Dyad": {
      "renderStyle": "standard",
      "edges": [{"S": 1, "M": [{"x": 550, "y": 420}], "E": 2}]
    }
  }
  connect(fixed_temp.port, variable_resistor.heat_port) {
    "Dyad": {
      "renderStyle": "standard",
      "edges": [{"S": 1, "M": [{"x": 551, "y": 790}], "E": 2}]
    }
  }
end
Flattened Source
dyad
"""
MSL validation test: ShowVariableResistor.

Recreates `Modelica.Electrical.Analog.Examples.ShowVariableResistor` from MSL v4.0.0.
A sine voltage source drives two parallel branches: a fixed 3-resistor chain
(R1-R2-R3, each 1 Ohm) and a variable-resistor chain (R4-VR-R5).
The variable resistor's value is swept by a ramp from 2 to 7 Ohm over 2 s.
The VariableResistor branch should be compared with R2 in the fixed branch.

MSL reference: tolerance=1e-6, StopTime=1.
"""
example component ShowVariableResistor
  "Sine voltage source: V=1 V, f=1 Hz"
  sine = BlockComponents.Sources.Sine(amplitude = 1, frequency = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 20, "y1": 20, "x2": 120, "y2": 120, "rot": 0}
      },
      "tags": []
    }
  }
  "Voltage source driven by the sine signal"
  voltage_source = ElectricalComponents.Analog.Sources.VoltageSource() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 100, "y1": 230, "x2": 200, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  "Ground at source negative terminal"
  ground1 = ElectricalComponents.Analog.Basic.Ground() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 10, "y1": 660, "x2": 110, "y2": 760, "rot": 0}
      },
      "tags": []
    }
  }
  "Ground at return path (right side)"
  ground2 = ElectricalComponents.Analog.Basic.Ground() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 900, "y1": 690, "x2": 1000, "y2": 790, "rot": 0}
      },
      "tags": []
    }
  }
  "Fixed resistor chain (top branch)"
  R1 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 300, "y1": 230, "x2": 400, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  R2 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 500, "y1": 230, "x2": 600, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  R3 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 700, "y1": 230, "x2": 800, "y2": 330, "rot": 0}
      },
      "tags": []
    }
  }
  "Variable resistor chain (bottom branch)"
  R4 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 290, "y1": 530, "x2": 390, "y2": 630, "rot": 0}
      },
      "tags": []
    }
  }
  variable_resistor = ElectricalComponents.Analog.Basic.VariableResistor() {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 500, "y1": 530, "x2": 600, "y2": 630, "rot": 0}
      },
      "tags": []
    }
  }
  R5 = ElectricalComponents.Analog.Basic.Resistor(R = 1) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 700, "y1": 530, "x2": 800, "y2": 630, "rot": 0}
      },
      "tags": []
    }
  }
  "Ramp signal for variable resistance: offset=2, height=5, duration=2 s"
  ramp = BlockComponents.Sources.Ramp(height = 5, offset = 2, duration = 2) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 380, "y1": 370, "x2": 480, "y2": 470, "rot": 0}
      },
      "tags": []
    }
  }
  "Fixed temperature to ground the thermal port (alpha=0, so T is irrelevant)"
  fixed_temp = ThermalComponents.Sources.FixedTemperature(T = 300.15) {
    "Dyad": {
      "placement": {
        "diagram": {"iconName": "default", "x1": 320, "y1": 740, "x2": 420, "y2": 840, "rot": 0}
      },
      "tags": []
    }
  }
relations
  guess variable_resistor.i = 0
  "Signal to voltage source"
  connect(sine.y, voltage_source.V) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 150, "y": 70}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Source positive to ground1 (matches MSL SineVoltage1.p -> Ground1)"
  connect(voltage_source.p, ground1.g) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 60, "y": 280}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Source negative to both branches (matches MSL SineVoltage1.n -> R1.p, R4.p)"
  connect(voltage_source.n, R1.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(voltage_source.n, R4.p) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 270, "y": 280}, {"x": 270, "y": 580}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Top branch: R1 -> R2 -> R3 -> ground2"
  connect(R1.n, R2.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(R2.n, R3.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(R3.n, ground2.g) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 950, "y": 280}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  "Bottom branch: R4 -> VR -> R5 -> ground2"
  connect(R4.n, variable_resistor.p) {"Dyad": {"edges": [{"S": 1, "M": [], "E": 2}], "renderStyle": "standard"}}
  connect(R5.n, ground2.g) {
    "Dyad": {
      "edges": [{"S": 1, "M": [{"x": 950, "y": 580}], "E": 2}],
      "renderStyle": "standard"
    }
  }
  connect(variable_resistor.n, R5.p) {"Dyad": {"renderStyle": "standard", "edges": [{"S": 1, "E": 2, "M": []}]}}
  connect(ramp.y, variable_resistor.R) {
    "Dyad": {
      "renderStyle": "standard",
      "edges": [{"S": 1, "M": [{"x": 550, "y": 420}], "E": 2}]
    }
  }
  connect(fixed_temp.port, variable_resistor.heat_port) {
    "Dyad": {
      "renderStyle": "standard",
      "edges": [{"S": 1, "M": [{"x": 551, "y": 790}], "E": 2}]
    }
  }
metadata {}
end


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