Electrical Source Conversion

Superconducting power line

One of the most basic principles of power supplies is that the user expects an ideal source. Designers of electrical equipment and electronic circuits generally assume that this type of energy supply is available. Most of us are accustomed to this idea. The electric utility grid is carefully operated to provide a sinusoidal voltage source of good quality. Student lab […]

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Introduction to Power Converter Concepts


Throughout the following posts, basic concepts of the electrical energy conversion process, together with indicators of conversion quality, are introduced. We need to establish a specific set of objectives for a converter. It is important to identify performance measures to determine ether objectives are being met. How can user expectations for a power supply be translated into design goals? How […]

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Summary of Power Switch Analysis

Power Switch Circuit Analysis

Switches are the key to electronic conversion of energy. Three major aspects of design – the hardware, software, and interface problems – can be defined and studied. Consider some of the major concepts covered so far: The hardware problem (build a switch matrix). Switches can be organized in a matrix. Given information about the source and the load, the switch […]

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Fourier Series Representations of Switching Functions


To take full advantage of Fourier analysis, we need to consider series representations of switching functions. The idea is to figure out the Fourier Series of a switching function in some general way, in order to avoid recomputing it multiple times in the future. Since any switching function is either 0 or 1, and is normally periodic, a plot of […]

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Fourier Series of an Inverter Circuit

Power Inverter Circuit

One of the simplest inverters switches between polarities of a DC input to create a square wave. This wave can be filtered to give an approximate sinusoidal output. Let’s find the Fourier Series of a square wave of radian frequency . We will also determine which components are wanted and the amplitude of the wanted components. These specifications will have […]

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Fourier Series of Full-Wave Rectifier Circuit

Diode bridge rectifier

In an earlier post, we established that there is typically only a single component of the Fourier Series desired in most cases. All other components are effectively noise. An example of a typical full-wave rectifier circuit will help to illustrate this idea. Let’s compute the Fourier Series of a full-wave rectified signal . What is the fundamental frequency? Which is […]

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