Fundamentals of Power Electronics by Robert W. Erickson

By Robert W. Erickson

In many college curricula, the facility electronics box has developed past the prestige of comprising one or special-topics classes. frequently there are a number of classes facing the facility electronics box, overlaying the themes of converters, motor drives, and gear units, with in all likelihood extra complex classes in those components to boot. There can also be extra conventional power-area classes in power conversion, machines, and tool platforms. within the breadth vs. intensity tradeoff, it now not is sensible for one textbook to try to hide all of those classes; certainly, each one direction should still preferably hire a committed textbook. this article is meant to be used in introductory strength electronics classes on converters, taught on the senior or first-year graduate point. there's adequate fabric for a three hundred and sixty five days direction or, at a speedier speed with a few fabric passed over, for 2 quarters or one semester. the 1st classification on converters has been known as a fashion of attractive regulate and electronics scholars into the facility quarter through the "back door". the facility electronics box is sort of large, and comprises basics within the parts of • Converter circuits and electronics • keep watch over platforms • Magnetics • energy purposes • Design-oriented research This big choice of parts is likely one of the issues which makes the sphere so attention-grabbing and attractive to newbies. This breadth additionally makes educating the sphere a demanding venture, simply because one can't suppose that each one scholars enrolled within the category have reliable prerequisite wisdom in such a lot of areas.

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An equivalent form is obtained by dividing both sides of Eq. 20) The right-hand side of Eq. 20) is recognized as the average value, or de component, of vL (t). 20) states that, in equilibrium, the applied inductor voltage must have zero de component. The inductor voltage waveform of Fig. 9 is reproduced in Fig. 12, with the area under the vL (t) curve specifically identified. 24) Solution for V yields which coincides with the result obtained previously, Eq. 3). So the principle of inductor volt-second balance allows us to derive an expression for the de component of the converter output voltage.

This will allow us to determine the converter voltages, currents, and efficiency using well-known techniques of circuit analysis. In the previous section, we used the principles of inductor volt-second balance and capacitor charge balance to write Eqs. 15) Steady-State Equimlent Circuit Modeling, Losses, and Efficiency 47 D'V Fig. 10 Circuit whose loop equation is identical to Eq. 16), obtained by equating the average inductor voltage ( vL) to zero. These equations state that the de components of the inductor voltage and capacitor current are equal to zero.

In steady state, the average current applied to a capacitor must be zero. By knowledge of the slopes of the inductor current and capacitor voltage waveforms, the ac switching ripple magnitudes may be computed. Inductance and capacitance values can then be chosen to obtain desired ripple magnitudes. In converters containing multiple-pole filters, continuous (nonpulsating) voltages and currents are applied to one or more of the inductors or capacitors. Computation of the ac switching ripple in these elements can be done using capacitor charge and/or inductor flux-linkage arguments, without use of the small-ripple approximation.

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