Ramp voltage

Voltage ramp from offset to offset + V.

  • electrical
  • Modelica Standard Library
  • 2 ports
  • 4 parameters
BlockRamp voltageKindrampVoltageLibraryElectrical

Description

An ideal voltage source that holds Offset until Start time, rises linearly by V over Duration, then stays at Offset + V.

Example

Electrical sources Every voltage and current source driving a resistor, each with a voltmeter across it.

DC 12 VLoad A 12 Ωv AGround ADC 1 ALoad B 10 Ωv BGround BSine 10 VLoad C 10 Ωv CGround CSine 1 ALoad D 10 Ωv DGround DRamp 10 VLoad E 10 Ωv EGround EPulse 5 VLoad F 10 Ωv FGround F3 sin(2π·50t)Signal voltageLoad G 10 Ωv GGround G0.5Signal currentLoad H 10 Ωv HGround H
In Gradara, select a Ramp voltage block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:DC voltageVoltage sensorConstantGroundSine waveResistorAC voltageAC currentDC currentPulse voltageControlled voltageControlled current

Ports

Conserving terminals 2

  • +pelectrical

    Positive terminal.

  • −nelectrical

    Negative terminal.

Parameters

  • HeightV12 V

    Total rise, in volts. Negative values ramp down.

  • Durationduration1 s

    ≥ 0

    Time taken to rise, in seconds. Must be greater than 0.

  • Offsetoffset0 V

    Voltage before the ramp, in volts.

  • Start timestartTime0 s

    ≥ 0

    Time the ramp starts, in seconds. 0 or more.

Equations

Modelica
p.v − n.v = offset for time < startTime
p.v − n.v = offset + V · (time − startTime) / duration for startTime ≤ time < startTime + duration
p.v − n.v = offset + V afterward
p.i + n.i = 0

Implementation

Modelica Standard Library 4.1.0Modelica.Electrical.Analog.Sources.RampVoltage
MSL documentation

Tips

  • Use it for soft-start supplies that would otherwise charge capacitors with a current spike.

See also

Select a block in Gradara and press F1 to open its page offline.