DVM - Design Verification Module

AC Glitch Input Source

The AC glitch input source simulates a "glitch" disturbance in the AC line. The glitch amplitude can be greater or less than the line voltage. The phase angle and duration of the glitch are programmable. This source can be configured to simulate a broad range of abnormal AC Line voltage conditions.

The AC Glitch source is not used in any test objectives. You can set a AC Source to a Glitch type source using the testplan syntax below.

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AC Glitch Input Source Parameters
Testplan Entry
Waveforms

Model Name	AC Glitch Input Source
Simulator		This device is compatible with both the SIMetrix and SIMPLIS simulators.
Parts Selector Menu Location	DVM ▶ Source ▶ 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_GLITCH
Schematic

AC Glitch 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.
AC_VOLTAGE2	230	Real	min:0	V	The peak voltage of the source during a glitch event. See the waveforms section for details.
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.
PHASE_ANGLE	0	Real	0 - 180	°	Sets the phase angle where the glitch disturbance occurs.
PULSE_WIDTH	200u	Real	min:0	s	The duration of the line glitch 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:	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.
PHASE_ANGLE	0	Real	0 - 360	°	Sets the phase angle where the glitch disturbance occurs.

Testplan Entry

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

The AcGlitch() testplan entry has the following syntax with the arguments taken from the list of parameters above.

AcGlitch(REF, LINE_RANGE, NOMINAL_VOLTAGE, GLITCH_VOLTAGE, FREQUENCY, PHASE_ANGLE, PULSE_WIDTH, RISE_TIME)
AcGlitch(REF, LINE_RANGE, NOMINAL_VOLTAGE, GLITCH_VOLTAGE, FREQUENCY, PHASE_ANGLE, 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 managed 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.
NOMINAL_VOLTAGE	min:0	The RMS voltage for the input source during the normal operating conditions. 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.
GLITCH_VOLTAGE	min:0	The peak voltage for the input source during the glitch event. The voltage can be a numeric value or a symbolic value, such as HL_Maximum. 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.
PHASE_ANGLE	0-180	The phase angle of the glitch disturbance
PULSE_WIDTH	min:>0	The duration of the glitch disturbance
RISE_TIME	mon:>0	The rise time of the underlying AC square wave sources
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, as shown in the example below. The order of the parameter names does not matter.

Waveforms

This example uses the optional parameter LINE_PHASEANGLE set to 90°, and a PHASE_ANGLE of 30°. The duration of the glitch event is set with the PULSE_WIDTH parameter. The voltage transition between the normal AC voltage and the glitch voltage is limited by the combination of the slew rate limiter and the programmable low pass filter.