From there, you can download free copies of the software either for Windows operating system or for the Macintosh operating system. To get started, what you should do is follow this link to the LTspice website. Also in red, here is a plot of the inductor current waveform during the same turn-on transient. The green wave form here is the output voltage that it computes, it goes through some turn-on transient and eventually settles down to a DC voltage that is approximately for the buck converter approximately equal to the input voltage multiplied by the duty cycle. So, here is a turn-on transient of a buck converter where the output starts at zero. Then, SPICE can numerically calculate things of interest in the converter such as the waveforms in a transient analysis, as well as other things like frequency analysis plots. Here's an example which we're going to talk about in this lecture. Since then, there have been many commercial implementations of it, and one of them LTspice is freely available now and I think works very well.

SPICE is a program that was originally developed at UC, Berkeley in the 1960s.

Know how to derive an averaged equivalent circuit model and solve for the converter efficiencyĪ basic understanding of electrical circuit analysis is an assumed prerequisite for this course.

Be able to solve for the steady-state voltages and currents of step-down, step-up, inverting, and other power converters.

Understand what a switched-mode converter is and its basic operating principles.

Assignments include simulation of a dc-dc converter, analysis of an inverting dc-dc converter, and modeling and efficiency analysis of an electric vehicle system and of a USB power regulator. Principles of converter circuit analysis are introduced, and are developed for finding the steady state voltages, current, and efficiency of power converters. This course introduces the basic concepts of switched-mode converter circuits for controlling and converting electrical power with high efficiency. This course can also be taken for academic credit as ECEA 5700, part of CU Boulder’s Master of Science in Electrical Engineering degree.

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