Piecewise Linear Voltage Source

R2026b

Time-dependent voltage source using lookup table

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  • Piecewise Linear Voltage Source block

Libraries:
Simscape / Electrical / Sources
Simscape / Electrical / Additional Components / SPICE Sources

Description

The Piecewise Linear Voltage Source block represents a voltage source that you specify in lookup table form using a vector of time values and a vector of the corresponding voltage values. You must specify at least two time-current value pairs. The block generates a time-dependent voltage based on these time-voltage values using the selected interpolation and extrapolation methods. You have a choice of two interpolation methods and extrapolation methods. The output voltage is independent of the current through the source.

Examples

Linear LED Driver

Linear LED Driver

A LED driver based on a linear current regulator. The scope shows the light and current output and the supply voltage. The output comes into regulation for a supply voltage greater than about 12V.

SPICE Conversion of a MOSFET Subcircuit and Validation

SPICE Conversion of a MOSFET Subcircuit and Validation

Convert a metal-oxide-semiconductor field-effect transistor (MOSFET) subcircuit into an equivalent Simscape™ component and compare the Spice and Simscape plots for some standard MOSFET characteristics, namely Id versus Vgs, Id versus Vds, Qiss/ Gate charge, Qoss/ Output charge, and Breakdown voltage. The subcircuit2ssc function converts all the subcircuit components inside a SPICE netlist file into one or more equivalent Simscape files.

Troubleshoot a SPICE Conversion of an IGBT Subcircuit

Troubleshoot a SPICE Conversion of an IGBT Subcircuit

Troubleshoot the conversion of a SPICE insulated gate bipolar transistor (IGBT) subcircuit and convert it into an equivalent Simscape™ component. The subcircuit2ssc function converts all the subcircuit components inside a SPICE netlist file into one or more equivalent Simscape files. However, in some cases, you must manually edit the original SPICE netlist.

Assumptions and Limitations

The Piecewise Linear Voltage Source block does not support energy accounting. If you try to get energy information for this block using the getEnergyInfo function, the function generates an error message.

Ports

Conserving

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Electrical conserving port associated with the piecewise linear voltage source positive voltage

Electrical conserving port associated with the piecewise linear voltage source negative voltage

Parameters

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Vector of time values as a tabulated 1-by-n array. The time values vector must be strictly monotonically increasing.

Vector of voltage values as a tabulated 1-by-n array. The voltage values vector must be the same size as the time values vector.

Select the method that the block uses to determine the output current values at intermediate time points that are not specified in the preceding vectors:

  • Linear — Prioritize performance by using a linear function.

  • Smooth — Prioritize accuracy by producing a continuous curve with continuous first-order derivatives.

Select the method that the block uses to determine the output current values at time points that are outside the time range specified in the preceding vectors:

  • Nearest — Select this option to use the nearest input value for extrapolation.

  • Linear — Select this option to use a linear function.

References

[1] D. Kahaner, C. Moler, and S. Nash. Numerical Methods and Software. Prentice Hall, 1988.

[2] W.H. Press, B.P. Flannery, S.A. Teulkolsky, and W.T. Wetterling. Numerical Recipes in C: The Art of Scientific Computing. Cambridge University Press, 1992.

Extended Capabilities

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C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2008a

See Also

Simscape Blocks

Functions

Topics