Power Electronics

Collection by Power Circuits

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Review of Fourier Series

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Nearly any periodic function of time , $latex f(t) $ such that $latex f(t)=f(t+T)$, can be written as a sum of sinusoids known as the Fourier Series. $latex f(t)= a_0 + \sum\limits_{n=1}^{\infty} a…

The Early History of Rectifying Devices

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In many ways, the search since the 1880s for better rectifier methods has grown into the entire field of power electronics. The basic form of the diode rectifier circuit was discussed in the ninete…

Fourier Series Representations of Switching Functions

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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 w…

The Effect of Phase on Switching Rectifiers

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In the previous post, we examined some of the most basic switch based rectifying circuits and saw that the switch could be replaced with a passive diode. Here, we will explore what happens when the…

Summary of Power Switch Analysis

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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 th…

Introduction to Switches

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We have seen that circuits involving switches and energy storage can be operated to give energy conversion functions. Switches come in a huge variety including mechanical and semiconductor styles. …

Characteristics of Power Semiconductor Devices

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Diode – Current ratings from under 1 A to more than 5000 A. Voltage ratings from 10 V to 10 kV or more. The fastest power devices switch in less than 20 nanoseconds, while the slowest require…

The Effect of Phase on Switching Rectifiers

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In the previous post, we examined some of the most basic switch based rectifying circuits and saw that the switch could be replaced with a passive diode. Here, we will explore what happens when the…

Inversion From DC Voltage

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Two of the fastest growing inverter applications are not as well served by the SCR. These are circuits for independent backup power and circuits for control of AC motors. A variety of modern commer…

Power Electronics Summary and Future Developments

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Much of the historical discussion in previous posts have described the special semiconductors used for power conversion circuits. The special energy processing applications addressed by power elect…

The Reliability Objective and Integration

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It is well established in military electronics that the more parts are in a system, the more likely it is to fail. As we shall see, power electronic circuits tend to have few parts, especially in t…

Important Variables and Notation

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In a power electronic system, several electrical quantities are of special interest. Efficiency has already been identified in previous posts. Maximum values of currents and voltages will be needed…

Recap of Power Electronics

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Power electronics involves the study of electronic circuits intended to control the flow of electrical energy. These circuits handle power flow at levels higher than the individual device ratings. …

Introduction to Switches

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We have seen that circuits involving switches and energy storage can be operated to give energy conversion functions. Switches come in a huge variety including mechanical and semiconductor styles. …

Characteristics of Power Semiconductor Devices

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Diode – Current ratings from under 1 A to more than 5000 A. Voltage ratings from 10 V to 10 kV or more. The fastest power devices switch in less than 20 nanoseconds, while the slowest require…

Electrical Source Conversion

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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 supp…