We have here, this is the buck converter power stage with the input voltage Vg of 24 volts, and output voltage that supplies a five ohm load resistor. Here, I have opened LTspice and opened the buck converter schematic. Or you can click on an element and it will plot the current through the element. When it's done, then to display a waveform, you can click on a node and it will give you the node voltage. When the simulation will take maybe 10 or 20 seconds to run. Then, what you do is press the run button to start the simulation. So, when you've done that, then you can double-click on this file buck.asc which will open the file in LTspice, and that file contains the circuit schematic. From this Coursera website, you can also download a zip file containing the buck converter circuit files for this example. 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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