AC Startup Input Source
The AC startup input simulates the initial startup of a AC line source. The delay before the startup is programmable as are the filter and slew rate limiter parameters which affect the simulated waveshape. In DVM, the AC Startup Source is used in the LineStartup() Test Objective.
In this topic:
| DVM Information | Power Supply (Non-DVM) Information | |
| Model Name | AC Startup Input Source | |
| Simulator |
 This device is compatible with both the SIMetrix and SIMPLIS
simulators. |
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| Parts
Selector Menu Location |
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| 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_STARTUP | POWER_SUPPLY_SOURCE_AC_STARTUP |
| Symbols |
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| Schematic |
Note: Power Supply probes will not have the "DVM" prefix.
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AC Startup 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. | |
| 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 startup source is activated. |
DVM Testplan Entry
To set a managed DVM source to use the AC Startup subcircuit, the source symbol must be set to support AC line sources. Then, to set the source definition to a AC Startup source, place a AcStartup() testplan entry in a Source column.
The AcStartup() testplan entry has the following syntax with the arguments taken from the list of AC Startup Input Source Parameters above.
AcStartup(REF, LINE_RANGE, VOLTAGE, FREQUENCY) AcStartup(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 Managed Sources and Loads. |
| 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* |
parameter_name1=parameter_value1 parameter_name2=parameter_value2The order of the parameter key-value pairs does not matter.
Waveforms
This example uses the optional parameter LINE_PHASEANGLE set to 90°, and a time delay before the source starts. The dotted curve represents the source prior to the startup time, which is set by the TIME_DELAY parameter. For simulation times greater than the TIME_DELAY, the source is a fixed AC sine wave.
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