Piecewise Linear Voltage Source
Time-dependent voltage source using lookup table
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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 four 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.
+ — Positive voltage
Electrical conserving port associated with the piecewise linear voltage source positive voltage
- — Negative voltage
Electrical conserving port associated with the piecewise linear voltage source negative voltage
Time specification — Vector of time values
[0, 1, 2, 3, 4]
Vector of time values as a tabulated 1-by-n array. The time values vector must be strictly monotonically increasing.
Current at specified time — Vector of current values
[0, 0, 0, 0, 0]
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.
Interpolation method — Interpolation method
Linear (default) |
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.
Extrapolation method — Extrapolation method
Nearest (default) |
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.
 D. Kahaner, C. Moler, and S. Nash. Numerical Methods and Software . Prentice Hall, 1988.
 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.