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. This source is used in the LineDropout() Test Objective.

In this topic:

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
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_DROPOUT
Symbols
Schematic

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 Sets the source resistance of the source.
TIME_DELAY 10u Real min:0 s Sets the time delay before the dropout event.

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 180°, 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.