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Switch- Mode Power Supplies: SPICE Simulations And Practical Designs

Switch- Mode Power Supplies: SPICE Simulations And Practical Designs

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Author : Christophe P Basso

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The book is organized in eight chapters covering the following subjects:

Chapter 1: this chapter starts with the basics of dc-dc conversion, starting step by step with linear regulators, to derive essential formulas such as closed-loop impedances or closed-loop input rejection. Then the classical buck, boost, buck-boost are analyzed in CCM/DCM and critical modes until an input filter is needed. There, discover the effects of the filter addition and learn how to compensate the converter while still attenuating the input noise (95 pages).

Chapter 2: small-signal modeling is really an important topic if you want to be serious about power supply designs. The chapter starts by showing what State Space Averaging is all about and how complicated it can come. The, the PWM switch model is introduced and three new versions are derived: auto-toggling DCM/CCM voltage-mode and current-mode models, with sub harmonic prediction in CCM for the later. Of course, these models are large signal ones and operate in dc, ac and transient analysis. Finally, a borderline model is derived, later used in PFC stages. This 100-page chapter really explains how these models were derived and how to use them for your studies (146 pages).

Chapter 3: loop control is always hard to understand for some new comers. I've strived to make things look simple, explaining how the k factor was derived and showing that, sometimes, it cannot be a panacea to use it. I propose different equations to let you manually select the poles and zeros, right crossing over at the desired point. Also, in most of the books, only op amps are used to illustrate compensation. In this book, author derived transfer functions of TL431 for type 2 and 3 compensators and show how the optocoupler pole can affect the phase margin (100 pages).

Chapter 4: this is where you will learn how to build your basic subcircuit blocks and how to construct your new models, if necessary. For instance, how to model the error amp of the UC384X family. Understand the differences between syntaxes and learn how to write in-line equations. A section specifically details the derivation of a magnetic model, based on non-linear junctions. See how to wire generic models in various configurations. Learn how to extract physical data from a transformer to later pass them to a subcircuit (66 pages).

Chapter 5: in this chapter, we cover the design of dc-dc converters, the classical structures, in both voltage-mode and current mode configurations. There are small-signal analysis and transient studies in all cases The front-end filter section is also analyzed with input ripple specification targets (84 pages).

Chapter 6: rectifying the sinusoidal mains is a section common to all ac-dc converters. After all, the diode bridge and the capacitor are the elements that really perform the ac to dc conversion. The downstream converter is still a dc-dc, no? This chapter covers the classical diode bridge configurations then introduces passive power factor correction, quickly followed by active power factor correction. The most popular topologies are covered and there are several design examples. An extensive usage of the average models is made here, leading to extremely short simulation times (88 pages).

Chapter 7: it is time to describe the isolated buck-boost also called the flyback converter. This chapter covers a lot of techniques pertinent to the flyback converter, what is the leakage inductor role, how it affects the drain voltage excursion and how you can use its presence in active clamp versions etc. The design section contains useful tricks to limit the converter power capability at high line for instance or to compensate the leakage spike on the auxiliary winding. There are three designs, among which a multi-output borderline converter using the new BCM average model, also described in the book (160 pages).

Chapter 8: the forward converter is widely used in ATX power supplies (the so-called silver box) where the 2-switch configuration excels in 250 to 400 W applications. The chapter explores the various reset methods and introduces you to multi-output configuration through mag amps, or synchronous rectifiers. A complete design example is proposed at the end of the book (129 pages).

CDROM: the CDROM found with the book contains some of the most popular demonstration versions of currently available simulation softwares.

Book Details
Hardcover: 264 pages
Subjects: education, non-fiction
ISBN: 9780071508582
Publisher: McGraw-Hill Professional Publishing
Published: 2008

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