Limiter

Limit the range of a signal

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

The Limiter block passes its input signal as output signal as long as the input is within the specified upper and lower limits. If this is not the case, the corresponding limits are passed as output.

The parameter homotopyType in the Advanced tab specifies the simplified behaviour if homotopy-based initialization is used:

NoHomotopy: the actual expression with limits is used
Linear: a linear behaviour y = u is assumed (default option)
UpperLimit: it is assumed that the output is stuck at the upper limit u = uMax
LowerLimit: it is assumed that the output is stuck at the lower limit u = uMin

If it is known a priori in which region the input signal will be located, this option can help a lot by removing one strong nonlinearity from the initialization problem.

Parameters (4)

uMax	Value: Type: Real Description: Upper limits of input signals
uMin	Value: -uMax Type: Real Description: Lower limits of input signals
strict	Value: false Type: Boolean Description: = true, if strict limits with noEvent(..)
homotopyType	Value: Modelica.Blocks.Types.LimiterHomotopy.Linear Type: LimiterHomotopy Description: Simplified model for homotopy-based initialization

Connectors (2)

	u	Type: RealInput Description: Connector of Real input signal
	y	Type: RealOutput Description: Connector of Real output signal

Type: RealInput

Description: Connector of Real input signal

Type: RealOutput

Description: Connector of Real output signal

Used in Examples (4)

	SMPM_Braking Modelica.Electrical.Machines.Examples.SynchronousMachines Test example: PermanentMagnetSynchronousMachine acting as brake
	DC_CompareCharacteristics Modelica.Electrical.Machines.Examples.DCMachines Test example: Compare torque-speed characteristic of DC motors
	SMPM_Braking Modelica.Magnetic.FundamentalWave.Examples.BasicMachines.SynchronousMachines Test example: PermanentMagnetSynchronousMachine acting as brake
	DrumBoiler Modelica.Fluid.Examples.DrumBoiler Complete drum boiler model, including evaporator and supplementary components

Used in Components (6)

	LimPID Modelica.Blocks.Continuous P, PI, PD, and PID controller with limited output, anti-windup compensation, setpoint weighting and optional feed-forward
	TotalHarmonicDistortion Modelica.Blocks.Math Output the total harmonic distortion (THD)
	Bode Modelica.ComplexBlocks.ComplexMath Calculate quantities to plot Bode diagram
	Signal2mPulse Modelica.Electrical.PowerConverters.ACDC.Control Generic control of 2*m pulse rectifiers
	SignalPWM Modelica.Electrical.PowerConverters.DCDC.Control Generates a pulse width modulated (PWM) boolean fire signal
	VoltageToAngle Modelica.Electrical.PowerConverters.ACAC.Control Reference voltage to firing angle converter