DVM - Design Verification Module

Sine Waveform Load

The Sine Waveform Load subcircuit models a time-varying load with a sinusoidal current. At time=0, the load starts at $\frac{1}{2}\left(\text{START_CURRENT}+\text{FINAL_CURRENT}\right)$, and has a sine-wave function. The sine load is not used in any test objectives. You can change any load to a Sine Waveform Load with a Sin() call in a Load column.

Other similar loads include:

Cosine Load - Same as a Sine Waveform Load but with a Cosine function.

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Parameters
Testplan Entry
Examples

Model Name	Sine Waveform Load
Simulator		This device is compatible with both the SIMetrix and SIMPLIS simulators.
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
Symbol Library	None - the symbol is automatically generated when placed or edited.
Model File	SIMPLIS_DVM_ADVANCED.lb
Subcircuit Name	SIMPLIS_DVM_ADVANCED_LOAD_2T_SIN SIMPLIS_DVM_ADVANCED_LOAD_3T_SIN SIMPLIS_DVM_ADVANCED_LOAD_4T_SIN
Symbols
Schematic - 2 Terminal
Schematic - 3 Terminal
Schematic - 4 Terminal

Parameters

The following table explains the relevant parameters.

Parameter Name	Default	Data Type	Range	Units	Parameter Description
COEFFICIENT	0	Real			The damping coefficient for the sinusoidal load current. If non-zero, the sinusoidal load current amplitude will decay with a time constant equal to$\frac{1}{\text{COEFFICIENT}}.
FINAL_CURRENT	750m	Real		A	The peak or maximum current for the sine wave 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 $\frac{1}{2}\left(\text{START_CURRENT}+\text{FINAL_CURRENT}\right)$ 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 sinusoidal waveform, used only if the USE_PHASE parameter is 1.
START_CURRENT	0	Real		A	The minimum or starting current for the sine 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 sinusoid 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.

Testplan Entry

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

The Sine Waveform Load testplan entry has the following syntax with the arguments taken from the list of parameters above.

Sin(REF, START_CURRENT, FINAL_CURRENT, FREQUENCY)
Sin(REF, START_CURRENT, FINAL_CURRENT, FREQUENCY, 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 managed DVM loads.
START_CURRENT	n/a	The minimum or starting current for the sine 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 sine wave 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 sine wave 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 examples below. The order of the parameter names does not matter.

Examples

The following examples set the first DVM managed load to a Sine Waveform Load with a minimum current of 0A and a peak current of 1A. The timing parameters and the optional parameter strings are different for each example.

Zero Time Delay Example

The TIME_DELAY parameter is set to zero, resulting in a sine wave which starts at the calculated value of $\frac{1}{2}\left(\text{START_CURRENT}+\text{FINAL_CURRENT}\right)$ at t=0.

*?@ Load
Sin(OUTPUT:1, 0, 1, 10k, 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 25us. Since the OFF_UNTIL_DELAY parameter is not specified, the TIME_DELAY is interpreted as a phase delay.

*?@ Load
Sin(OUTPUT:1, 0, 1, 10k, TIME_DELAY=25u)

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 25us, and the OFF_UNTIL_DELAY is set to 1; therefore, for simulation times less than the TIME_DELAY parameter, the load current is 0.5A, as determined by the following equation: $\frac{1}{2}\left(\text{START_CURRENT}+\text{FINAL_CURRENT}\right)$

*?@ Load
Sin(OUTPUT:1, 0, 1, 10k, TIME_DELAY=25u OFF_UNTIL_DELAY=1)

The results of this testplan entry are shown below: