A number of software packages are now available to simulate
the operation of nearly any power electronic circuit. Component characteristics
are included, and the programs are set up so that representation of a circuit
is relatively easy.
All are described on the Internet in some detail, and most
have student versions, limited-capability versions, limited-time versions, or
introductory packages. The comments that follow must be taken at a point in
time, since the software evolves rapidly.
MATLAB—An interactive program for numerical
computation and data visualization that is used by control engineers for
analysis and design. Numerous “toolboxes” such as SIMULINK, a differential
equation solver, are available for simulation of dynamic systems.
It provides an interactive graphical environment and a
customizable set of block libraries that allow for the design, simulation, and
implementation of control, signal processing, communications, and other
time-varying systems.
MATHCAD—An equation-based program that allows one to
document, perform, and share calculation and design work. It can integrate
mathematical notation, text, and graphics in a single worksheet. It allows
capture of the critical methods and values of engineering projects.
Spice—One of the early simulation programs, Spice
allows a circuit to be built directly on the display screen in schematic form.
Libraries are available for the various circuit elements. Both steady-state and
transient behavior can be analyzed.
Many related programs are also available—PSpice, Saber, and
Micro-Cap to name just a few. Some are directly compatible with Spice.
ElectroMagnetic Transients Program (EMTP)—Devoted
primarily to the solution of transient effects in electric power systems,
variants are available for circuit work. It is developed and maintained by a
consortium of international power companies and associated organizations.
The core program is in the public domain. The above is only
a sampling of the more popular software available for circuit analysis. Most
packages can be purchased on the Internet and some have student versions that
can be downloaded at no cost.
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