Chapter 4 : we now enter the world of compensation: how to shape the return path so that my control system be stable, fast and precise. Nothing new here, but this is done step by step so that you can follow the path. A few examples put the PID at work and show that in some cases where Bode says it will be stable, the system isn't.
Learn why and how to properly compensate your product. Chapter 5 : this chapter covers compensators using operational amplifiers. You will find type 1, 2 and 3 structures, with and without optocouplers. You have all the equations, ready to use. I even re-wrote the k factor equations for those interested in the approach. All derivations steps are detailed and commented. They are easy to design and require less die area than they op amp cousins.
However, the set of equations you have for op amps does not readily apply. I have re-derived all the design equations in this chapter. Even if you add an optocoupler, it is covered. Also, I explain why it is difficult to build a type 3 with an OTA and what are its limitations. C hapter 7 : the TL is the most popular elements found in todays power converters. Hosting a precise reference voltage and an open-collector op amp, it is a remarkably well-crafted device. Actually, op amp and reference make only one and the transistors arrangement was made by a genius designer!
Check TL internals and learn how to use that component to build type 1, 2 and 3 compensators with an optocoupler. Rather than hosting a voltage control input, these devices are sensitive to injected current as a means to control the duty ratio. Again, previous equations no longer fit and I have reworked them all for the classical compensator types. Chapter 9 : bench measurements are mandatory when you deal with control systems.
It is important to verify that all hypothesis you made during the design phase lead to the expected phase and gain margins on the real prototype. And a prototype is a real piece of hardware, not a Simplis simulation bench, please! In this chapter, I explain the theory behind closed-loop measurements and where to be careful for reliable measurements. Then follow 5 design examples, putting theory at work. Simulation files:. There is no CDROM with that book but there are available simulation files that correspond to some of the book examples.
Download e-book Simulation of the Buck Boost Converter using LTspice (Design Kit Book 3)
These examples are simulated with Intusoft IsSpice and their demonstration version will certainly run a few of them. Didier Balocco was kind enough to translate some of these examples in LTSpice. These are beta versions. If you have the time to translate the remaining examples, I will be glad to post them in this webpage. Yes, I know it for fact, there will be errors and typos in the equations I derived in this book. The term derived is correct because I really worked almost all these equations myself. First, because doing so let me identify obstacles that I could teach you how to avoid them when you follow my steps.
I apologize in advance if you find errors, mistakes or typos in these mathematical expressions. Given their number and despite the care I put in chasing them, this is unavoidable. Please, let me know where these errors are and I will maintain an errata list 1st print , 2nd print , giving credits to people who found these mistakes.
Merci d'avance! Thanks in advance. The flyer is here.
If you want to read my interview by EEWeb, please follow this link. I'm sure some of you will recognize the guy in the wall poster :. Another book on power electronics you say? Not really. In the technical literature, you either have books that are purely academicals and offer in-depth analysis of converters, unfortunately without the essential links to the market reality.
Simulating Buck-Boost Converter Designs | Advanced PCB Design Blog | Cadence
You also have purely practical books that pull equations out of thin air without any theoretical grounds. This book bridges both approaches and will hopefully please the power electronics student and the design engineer, both looking for analytical explanations but also for practical solutions when facing customer demands. It covers dc-dc but also ac-dc converters. By the way, the ac-dc conversion in offline converters is made by the diodes bridge and the capacitor, the downstream converter is always a dc-dc, isn't it?
Xi e -xie to Patrick Wang and a rigato gozaimasu to Iguchi-san! The book is now available in simplified Chinese and Korean. Thank you to Mr Zhangde Lu who translated the whole book in a record time! The book is organized in eight chapters covering the following subjects:.
Chapter 1: this chapter starts with the basics of dc-dc conversion, step by step with linear regulators used to derive essential formulas such as closed-loop impedances or closed-loop input rejection. There, you will discover the effects of the filter insertion 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.
- e-book Simulation of the Buck Boost Converter using LTspice (Design Kit Book 3)!
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The chapter starts by showing what State Space Averaging is all about and how complicated it can be. 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 page chapter really explains how these models were derived and how to use them for your studies 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 is not a panacea. I propose different equations to let you manually select the poles and zeros, crossing over at the exact desired frequency.
Also, in most of the books, only op amps are used to illustrate compensation. In this book, I derived the transfer functions of TLbased type 2 and 3 compensators and I showed how the optocoupler pole can affect the phase margin 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 UCX 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.
Equivalent Circuit Model Library. TDK Corporation Passive Application Center
See how to wire generic PWM models in various configurations for the best simulation speed. 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. C hapter 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 configuration then further 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. C hapter 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 design examples, among which a multi-output borderline converter using the new BCM average model, also described in the book 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 to W applications.
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The chapter explores the various reset methods and introduces you to multi-output configurations through mag amps, or synchronous rectifiers. A complete design example is proposed at the end of the book pages. Some of the distributed versions also feature examples kindly translated by the software editors themselves. Other demos include Power , Transim and TopSpice. I updated the Excel file dedicated to the k-factor to which TLbased configurations have been added.
Download the Table Of Content. I purposely created specific application circuits that are not given away with the book. The same applies for Power Factor Correction circuits, ready to go on several platforms. Please drop me a line to my address: cbasso wanadoo. I am currently setting up a distribution network for these files.
I also have participated to the development of a more comprehensive library file with AEi Systems. There are currently more than PWM IC models in this file and you can obtain a detailed quotation and information via this link. Yes, I know, there is place for more and there are subjects that I did not cover.