AC Quasi-Square-Wave Input Source

The AC quasi-square-wave input source models the line voltage typically generated by inverters.

The AC Quasi-Square-Wave source (QSW) is not used in any test objectives. You can set a AC Source to a QSW type source using the testplan syntax below.

In this topic:

Model Name	AC Quasi-Square-Wave Input Source
Simulator		This device is compatible with both the SIMetrix and SIMPLIS simulators.
Parts Selector Menu Location	DVM > Sources > DVM Input Source w/ AC Line Support
Symbol Library	None - the symbol is automatically generated when placed or edited.
Model File	SIMPLIS_DVM_ADVANCED.lb
Subcircuit Name	SIMPLIS_DVM_ADVANCED_SOURCE_AC_QSW
Symbols
Schematic

AC Quasi-Square-Wave Input Source Parameters

The following table explains the relevant parameters.

Parameter Name	Default	Data Type	Range	Units	Parameter Description
AC_VOLTAGE1	115	Real	min: 0	V	The RMS value of the source during normal operating conditions.
FREQUENCY	50	Real	min: >0	Hz	The frequency of the source
F_CORNER	1Meg	Real	min: >0	Hz	The corner frequency for the internal low pass filter. The number of poles is set by the N_ORDER parameter.
LINE_PHASEANGLE	0	Real	0- 360	°	Sets the source phase angle at time=0. Most often used in three phase systems to set the phase angle of each phase.
N_ORDER	0	Real	0 - 3		The number of poles in the filter. Set to 0 to remove the filter from the design.
PULSE_WIDTH	200u	Real	min:0	s	The duration of the pulse in seconds.
RISE_TIME	10u	Real	min:>0	s	The rise and fall time of the internal square wave source. See the waveforms section for details.
SLEW_RATE	10Meg	Real	max: 1E11	V/s	The maximum slew rate of the voltage source
SOURCE_INDUCTANCE	795.8u	Real	min: 0	H	Sets the inductance of the line source
SOURCE_NAME	SRC	String	n/a	n/a	Name of the DVM source. This name cannot contain spaces.
SOURCE_RESISTANCE	0.4	Real	min:0	Ω	Sets the source resistance of the source.

Testplan Entry

To set a managed DVM source to use the AC Quasi-Square-Wave subcircuit, the source symbol must be set to support AC line sources. Then, to set the source definition to a AC QSW source, place a AcQsw() testplan entry in a Source column.

The AcQsw() testplan entry has the following syntax with the arguments taken from the list of AC Quasi-Square-Wave Input Source Parameters above.

AcQsw(REF, LINE_RANGE, AC_VOLTAGE1, FREQUENCY, PULSE_WIDTH, RISE_TIME)
AcQsw(REF, LINE_RANGE, AC_VOLTAGE1, FREQUENCY, PULSE_WIDTH, RISE_TIME, OPTIONAL_PARAMETER_STRING)

Argument	Range	Description
REF	n/a	The actual reference designator of the DVM Source or the generic syntax of INPUT:`n` where `n` is an integer indicating a position in the list of DVM sources.
LINE_RANGE	LL or HL	The line range to select the correct symbolic voltage value. This can only be the two strings LL or HL.
AC_VOLTAGE1	min:0	The pulse voltage for the input source. The voltage can be a numeric value or a symbolic value, such as a percentage of nominal input voltage. Symbolic values use the LINE_RANGE parameter to find the correct symbolic value.
FREQUENCY	min: > 0	The AC line frequency of the input source. This is used to both set the frequency of the input source and to set the simulation timing. The frequency can be a numeric or a symbolic value, such as F_High or F_Low.
PULSE_WIDTH	min:>0	The pulse duration of the source
RISE_TIME	min:>0	The rise and fall times of the source
OPTIONAL_PARAMETER_STRING	n/a	Parameter string with any of the other parameters from the parameter table above*

* If more than one parameter is specified, join the parameter key-value pairs with a space, for example:

parameter_name1=parameter_value1 parameter_name2=parameter_value2

The order of the parameter key-value pairs does not matter.

Waveforms

This example uses the optional parameter LINE_PHASEANGLE set to 90°. The pulse width is set to 30% of the period and the rise time to 5% of the period.