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Artículo: AMZ-B0G6FQSGKR
Modelling, Control, and Simulation of DC-DC Converters
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- This book deals with modelling, control, and simulation of DC-DC converters. In chapters 1 to 7, the modelling technique based on “the method of dependent sources” is applied to buck, boost, buck-boost, flyback, forward, half-bridge, full-bridge, and push-pull converters. It must be noted that this modelling technique not only provides us with the dynamic behavior of the converter, but also with its static behavior. Hence, the result of the modelling process is the complete knowledge of the converter, including the necessary design equations for static operation and the small-signal transfer functions for dynamic operation. In each chapter we have tried to provide all these equations for the different converters so that the book can also be used as a quick guide to find the necessary information for both static and dynamic design of the most common DC-DC converters. This modelling technique is much more friendly than the one based on the coldness of equation averaging. It gives us equivalent circuits that by themselves are much easier to understand than equations and allow for a better insight into the operation and behavior of the converter. Chapter 8 focuses on the implementation of compensators for closed-loop operation. We thought it convenient to include this chapter to show the different implementations of compensators using different techniques, i.e., not only based on the use of operational amplifiers (OPA) but also on the use of transconductance amplifiers (OTA). Many integrated circuits intended to control power converters incorporate OTAs instead of OPAs for the implementation of the compensator, because of their many advantages when used for this function. Also, in the introduction of this chapter we explain the DC operation of the compensator in closed loop. This is something that we have never seen in any book and that we think is very important for beginners to clearly understand the closed loop operation by knowing the DC levels that are expected in the different nodes of the loop. Also, in the introduction we explain how the frequency response of the OPA or OTA affects the final response of the converter in closed loop, i.e., from the reference voltage to the output voltage, which is something that we have never seen before in any book. The frequency response of the OPA and OTA is also considered in this chapter to show how to analyze with more accuracy the frequency response of the compensator, which will also have an important effect on the converter response in closed loop. This chapter also presents how to implement and model isolated compensators based on the use of optocouplers. The implementation of compensators with a TL431 is also shown in this chapter, both in non-isolated and isolated versions. The chapter ends with the presentation of two design examples of type II and type III compensators for a voltage-mode-controlled buck converter. Chapter 9 deals with different control methods of DC-DC converters, namely voltage-mode, current-mode, hysteretic, on-time, and off-time control of DC-DC converters. These control methods are not only analyzed in the conventional way that can be found in many books but also by means of more sophisticated techniques based on sampling theory and discrete-time analysis. The loop delay also affects the dynamic response of the converter in closed loop as is also studied in this chapter. Finally, chapter 10 is devoted to computer simulation of DC-DC converters. This chapter explains how to simulate DC-DC converters including their dynamic behavior to obtain the different transfer functions of the converter. Different possibilities to carry out simulations based on the actual converter, averaged models, and small-signal models are presented.
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