Triangle Waveform Load

The Triangle Waveform Load subcircuit models a repeating triangle waveform load current. This load is not used in any test objectives, but you can set a load to use this subcircuit with a Tri() call in the Load column of your testplan.

Other similar pulsed current loads include:

In this topic:

  DVM Information Power Supply (Non-DVM) Information
Model Name Triangle Waveform Load
Simulator
Parts Selector
Menu Location
  • DVM > Loads > DVM Output Load - 2 Terminal
  • DVM > Loads > DVM Output Load - 3 Terminal
  • DVM > Loads > DVM Output Load - 4 Terminal
Power Supply Loads > Power Supply Load ( DC Current, Pulse, Bode, Zout... )
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_LOAD_2T_TRI
  • SIMPLIS_DVM_ADVANCED_LOAD_3T_TRI
  • SIMPLIS_DVM_ADVANCED_LOAD_4T_TRI
 POWER_SUPPLY_LOAD_TRI
Symbols
Schematic - 2 Terminal
Note: Power Supply probes will not have the "DVM" prefix.
Schematic - 3 Terminal
Note: Power Supply probes will not have the "DVM" prefix.
Schematic - 4 Terminal
Note: Power Supply probes will not have the "DVM" prefix.

Triangle Waveform Load Parameters

The following table explains the relevant parameters.

Parameter Name Default Data Type Range Units Parameter Description
DRATIO 0.5 Real 0 to 1   The duty cycle ratio for the triangle waveform load
FINAL_CURRENT 750m Real   A The peak or maximum current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
FREQUENCY 10k Real min: > 0 Hz The frequency of the load pulse
IDLE_IN_POP 0 Real 0 or 1   If set to 0, the load current during the POP analysis is set to the START_CURRENT; otherwise the load will be active during the POP analysis.
LOAD_NAME LOAD String n/a n/a Name of the DVM load. This name cannot contain spaces.
OFF_UNTIL_DELAY 0 Real 0 or 1   If set to 1, the load current will be the START_CURRENT until the time specified by TIME_DELAY. If set to 0, the value of TIME_DELAY is interpreted as a phase delay.
PHASE_ANGLE 90 Real   ° The phase angle of the triangle waveform, used only if the USE_PHASE parameter is 1.
START_CURRENT 0 Real   A The valley or starting current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
TIME_DELAY 10u Real min: 0 s The delay before the load current pulse starts. The load behavior before the TIME_DELAY is determined by the OFF_UNTIL_DELAY parameter.
USE_PHASE 0 Real 0 or 1   If set to 1, the load is configured to use the phase angle supplied by the PHASE_ANGLE parameter.

DVM Testplan Entry

To set any managed DVM load to a Triangle Waveform Load subcircuit, place a Tri() testplan entry in the Load column.

The Tri() testplan entry has the following syntax with the arguments taken from the list of Triangle Waveform Load Parameters above.

Tri(REF, START_CURRENT, FINAL_CURRENT, FREQUENCY, DRATIO)
Tri(REF, START_CURRENT, FINAL_CURRENT, FREQUENCY, DRATIO, OPTIONAL_PARAMETER_STRING)
Argument Range Description
REF n/a The actual reference designator of the DVM load or the more generic syntax of OUTPUT:n where n is an integer indicating a position in the list of DVM loads. 
START_CURRENT n/a The valley or starting current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
FINAL_CURRENT n/a The peak or maximum current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
FREQUENCY min: > 0 The frequency of the triangle waveform load
DRATIO  0 to 1 The duty ratio of the load
OPTIONAL_PARAMETER_STRING n/a Parameter string with any of the other parameters from the parameter table above*

*    If multiple parameters are specified, join the parameter key-value pairs with a space, as shown in the DVM Examples below. The order of the parameter names does not matter.

DVM Examples

The following examples set the first DVM managed load to a Triangle Load with a starting current of 1A and a final current of 5A. The timing parameters and the optional parameter strings are different for each example.

Note: In the following testplans, the Load column is prefaced with the characters *?@ because it is the first column in the testplan.

Zero Time Delay Example

Since the TIME_DELAY parameter is set to zero, the pulse waveform begins with the START_CURRENT value of 0 at t=0.

*?@ Load
Tri(OUTPUT:1 , 1 , 5 , 10k , 0.70 , TIME_DELAY=0)

The results of this testplan entry are shown below:

Time Delay Example

In this example, the TIME_DELAY parameter is set to 50μs. Since the OFF_UNTIL_DELAY parameter is not specified, the TIME_DELAY is interpreted as a phase delay, meaning that the waveform is active from time=0.

*?@ Load
Tri(OUTPUT:1 , 1 , 5 , 10k , 0.70, TIME_DELAY=50u)

The results of this testplan entry are shown below:

Time Delay Example With OFF_UNTIL_DELAY=1

In this example the TIME_DELAY parameter is set to 50μs, and the OFF_UNTIL_DELAY is set to 1; therefore, for simulation times less than the TIME_DELAY parameter, the load current is 1A, which is the value of the START_CURRENT argument.

*?@ Load
Tri(OUTPUT:1 , 1 , 5 , 10k , 0.70, OFF_UNTIL_DELAY=1 TIME_DELAY=50u)

The results of this testplan entry are shown below:

Phase Delay Example

In this example, the USE_PHASE parameter is set to 1, and the PHASE_ANGLE parameter is set to 60. Setting USE_PHASE to 1 configures the load to use the PHASE_ANGLE parameter to determine the effective time delay. The time delay is calculated by:

\[ \text{TIME_DELAY} = \frac{\text{PHASE_ANGLE}}{\text{360*FREQUENCY}} \]

*?@ Load
Tri(OUTPUT:1 , 1 , 5 , 10k , 0.70, USE_PHASE=1 PHASE_ANGLE=60)

The results of this testplan entry are shown below:

Phase Delay Example With OFF_UNTIL_DELAY=1

In this example the PHASE_ANGLE parameter is set to 60, and the OFF_UNTIL_DELAY is set to 1; therefore, for simulation times less than the time delay defined by the PHASE_ANGLE parameter, the load current is 1A, which is the value of the START_CURRENT argument.

*?@ Load
Tri(OUTPUT:1 , 1 , 5 , 10k , 0.70, OFF_UNTIL_DELAY=1 USE_PHASE=1 PHASE_ANGLE=60)

The results of this testplan entry are shown below:

Converting between DVM and Power Supply Loads

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

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

Collected links
Load
Pulse Load - Single Current Pulse
Pulse Load - Single Pure Current Pulse
Symbolic Values
Managed Sources and Loads