vlimit :
A voltage limiting element.

The vlimit primitive represents a shunt resistor element that keeps the voltage difference between pos and neg within the specified limits. The parameters Vmax and Vmin define the maximum and minimum limits, respectively.

When the voltage difference V is within the limits, the element has a high shunt resistance, defined by the parameter Rpass, passing V as-is. On the other hand, when V is about to exceed one of the limits, the element switches to a low shunt resistance, defined by the parameter Rstop, stopping V at the corresponding limit. For effective voltage limiting, Rstop must be sufficiently small compared to the output resistance of the circuit driving the voltages.

Note that this primitive is a pseudo-module to describe a structural netlist of electrical circuits and not a behavioral model by itself. The XMODEL simulator extracts an event-driven behavioral model at run-time based on the circuit network described by these circuit-level pseudo-modules.

Input/Output Terminals

Name	I/O	Type	Description
pos	input	xreal	positive terminal
neg	input	xreal	negative terminal

Parameters

Name	Type	Default	Unit	Description
Vmax	real	`INFINITY	V	maximum voltage limit
Vmin	real	-`INFINITY	V	minimum voltage limit
Rpass	real	`INFINITY	ohms	shunt resistance while passing
Rstop	real	0.01	ohms	shunt resistance while limiting
m	real	1.0	None	multiplicity factor