AC Line Dropout Input Source

The AC line dropout input source simulates the shorting of the AC line source at a specific time and for a specified duration. In DVM, this source is used in the LineDropout() Test Objective.

In this topic:

	DVM Information	Power Supply (Non-DVM) Information
Model Name	AC Line Dropout 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	Power Supply Sources > Power Supply Source ( AC Line )
Symbol Library	SIMPLIS_DVM_ADVANCED.sxslb	power_supply_source_and_loads.sxslb
Model File	SIMPLIS_DVM_ADVANCED.lb	power_supply_source_and_loads.lb
Subcircuit Name	SIMPLIS_DVM_ADVANCED_SOURCE_AC_DROPOUT	POWER_SUPPLY_SOURCE_AC_DROPOUT
Symbols
Schematic	Note: Power Supply probes will not have the "DVM" prefix.

AC Line Dropout 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
DC_VOLTAGE	5	Real		V	The DC voltage offset of the source
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 line dropout in seconds.
SLEW_RATE	10Meg	Real	max: 1.0E11	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.
TIME_DELAY	10u	Real	min:0	s	Sets the time delay before the dropout event.

DVM Testplan Entry

To set a managed DVM source to use the AC Dropout subcircuit, the source symbol must be set to support AC line sources. Then, to set the source definition to a AC Dropout source, place a AcDropout() testplan entry in a Source column.

The AcDropout() testplan entry has the following syntax with the arguments taken from the list of AC Line Dropout Input Source Parameters above.

AcDropout(REF, LINE_RANGE, VOLTAGE, FREQUENCY)
AcDropout(REF, LINE_RANGE, VOLTAGE, FREQUENCY, 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.
VOLTAGE	min:0	The RMS 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.
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 0°, and a time delay before the dropout event. The duration of the dropout event is set with the PULSE_WIDTH parameter. The voltage transition between the normal AC voltage and the dropout voltage is limited by the combination of the slew rate limiter and the programmable low pass filter.

Converting between DVM and Power Supply Sources

To change a Power Supply source to a DVM source, right click the symbol to bring up the context menu, and select the menu option: Upgrade to DVM Source/Load

To change a DVM source to a Power Supply source, right click the symbol to bring up the context menu, and select the menu option: Downgrade to SIMetrix/SIMPLIS Source/Load