Inductors-Variable-and-Controllable

Inductors: Variable and Controllable
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Inductors: Variable and Controllable
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Inductors: Variable and Controllable
DESCRIPTION
COPY LINK: https://pdf.bookcenterapp.com/yumpu/B094CWJLPB The book is organized in five
chapters. Chapter 1 is an introductory chapter where the basic knowledge on magnetic devices is
reviewed. The fundamental laws of magnetic fields are presented, and the different types of
magnetic materials and their behavior are revised. Next, the spice modeling of magnetic circuits is
presented, showing the different elements that can be used to implement spice models of
magnetic structures: air gaps, linear and non-linear reluctances, permanent magnets, windings,
etc. The spice definitions of these components are provided for direct implementation in LTspice.
The chapter finalizes with some examples of implementation of LTspice models for simple
magnetic circuits.Chapter 2 deals with self-variable inductors, which are those whose inductance
value changes with the current circulating through them. This chapter is also used to introduce
several relevant aspects, as the definition of DC and AC inductors, the effective and differential
inductance, and the analysis methodology that will be later used in Chapter 3 to study the behavior
of controllable inductors. In this chapter, the real inductor is studied as an example of self-variable
inductor since, at the end, any physical inductor implemented on a magnetic material will change
its value with the current level circulating through it, so that it can be considered as a self-variable
inductor. Also, other more sophisticated structures of variable inductors that can be found in the
literature are presented and analyzed at the end of this chapter, namely, the self-variable inductor
with stepped air gap, and the self-variable inductor with sloped air gap. These structures can allow
the designer to have a better control of the change of the inductance against its current, to better
adapt them to a particular application.Chapter 3 focuses on controllable inductors. The chapter
explains how a structure of controllable inductor can mathematically be analyzed to obtain the
most important characteristics, as the main winding inductance versus bias current characteristic,
the DC and AC induction levels in the different parts of the structure, the voltage reflected across
the bias windings, the bias winding inductance versus the bias current, etc. Three different
structures are used as examples: the double-E structure, the quad-U structure, and the triple-E
structure. Some ideas about the use of permanent magnets in the design and implementation of
controllable inductors are also provided in this chapter. Finally, a design procedure for controllable
inductors is presented in the last section of the chapter. Examples of analysis and simulation of all
the structures are included. As in the rest of the book, free software is used for both mathematical
analysis and simulation, WinPython and LTspice respectively.In Chapter 4 driving and control
issues of controllable inductors are presented. The chapter starts with the basic modeling of the
bias circuit and its effect on the controllable inductor dynamics. A full dynamic model of the
controllable inductor is also presented. In the second part of the chapter, several solutions to
implement bias circuits are studied, which are based on linear current sources and switching
power converters. The dynamics of each solution is investigated, and examples are provided with
analysis in WinPython and simulations in LTspice.Finally, Chapter 5 presents several application
examples of controllable inductors, such as those in resonant inverters, DC-DC converters, LED
drivers, and high-power-factor AC-DC converters.