A Study of Two Control Methods for Full Bridge Converters: Soft Switch Bypass and Current Mode Control PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 61
Book Description
In a broad sense, there are now 3 basic categories for high power (above several KW) DC/DC converters: (1) Forced commutation (FC) (2) Resonant (R) (3) Soft switch (SS). Some topologies that are combinations of the above also have been proposed, such as certain pulse width modulation (PWM)-resonant arrangements. The first part of this project was a proposed improvement of the third category, the soft switch. The basic idea of this new converter was to use two additional switches that would bypass the loading during part of the operating cycle if the current decreased below a certain level. The motivation for this was to retain the soft switching characteristic at light loads--a common problem with soft switch converters. Although the bypass circuit proved functional, certain problems were uncovered which raise doubts about its ultimate feasibility. Because of these problems, the research emphasis was shifted from the bypass to an improve current mode control (CMC) converter that promised better results.
Author: Publisher: ISBN: Category : Languages : en Pages : 61
Book Description
In a broad sense, there are now 3 basic categories for high power (above several KW) DC/DC converters: (1) Forced commutation (FC) (2) Resonant (R) (3) Soft switch (SS). Some topologies that are combinations of the above also have been proposed, such as certain pulse width modulation (PWM)-resonant arrangements. The first part of this project was a proposed improvement of the third category, the soft switch. The basic idea of this new converter was to use two additional switches that would bypass the loading during part of the operating cycle if the current decreased below a certain level. The motivation for this was to retain the soft switching characteristic at light loads--a common problem with soft switch converters. Although the bypass circuit proved functional, certain problems were uncovered which raise doubts about its ultimate feasibility. Because of these problems, the research emphasis was shifted from the bypass to an improve current mode control (CMC) converter that promised better results.
Author: Xinbo Ruan Publisher: John Wiley & Sons ISBN: 9781118702208 Category : Technology & Engineering Languages : en Pages : 0
Book Description
Soft-switching PWM full-bridge converters have been widely used in medium-to-high power DC-DC conversions for topological simplicity, easy control and high effi ciency. Early works on soft-switching PWM full-bridge converter by many researchers included various topologies and modulation strategies. However, these works were scattered, and the relationship among these topologies and modulation strategies had not been revealed. This book intends to describe systematically the soft-switching techniques for pulse-width modulation (PWM) full-bridge converters, including the topologies, control and design, and it reveals the relationship among the various topologies and PWM strategies previously proposed by other researchers. The book not only presents theoretical analysis, but also gives many detailed design examples of the converters. Describes the soft-switching techniques for pulse-width modulation (PWM) full-bridge converters systematically Covers topologies, control and design, from the basics, through to applications and development Deliberates the soft-switching PMW control technique rather than the standard PWM control technique Presents detailed theoretical analysis with design examples for various possible variations to the full-bridge topology using the soft-switching technique Soft-Switching PWM Full-Bridge Converters: Topologies, Control, and Design is an essential and valuable reference for graduate students and academics majoring in power electronics and power supply design engineers. Senior undergraduate students majoring in electrical engineering and automation engineering would also fi nd this book useful.
Author: Simon Ang Publisher: CRC Press ISBN: 9780824722456 Category : Technology & Engineering Languages : en Pages : 574
Book Description
After nearly a decade of success owing to its thorough coverage, abundance of problems and examples, and practical use of simulation and design, Power-Switching Converters enters its second edition with new and updated material, entirely new design case studies, and expanded figures, equations, and homework problems. This textbook is ideal for senior undergraduate or graduate courses in power electronic converters, requiring only systems analysis and basic electronics courses. The only text of such detail to also include the use of PSpice and step-by-step designs and simulations, Power-Switching Converters, Second Edition covers basic topologies, basic control techniques, and closed-loop control and stability. It also includes two new chapters on interleaved converters and switched capacitor converters, and the authors have added discrete-time modeling to the dynamic analysis of switching converters. The final two chapters are dedicated to simulation and complete design examples, respectively. PSpice examples and MATLAB scripts are available for download from the CRC Web site. These are useful for the simulation of students' designs. Class slides are also available on the Internet. Instructors will appreciate the breadth and depth of the material, more than enough to adapt into a customized syllabus. Students will similarly benefit from the more than 440 figures and over 1000 equations, ample homework problems, and case studies presented in this book.
Author: Keng C. Wu Publisher: Elsevier ISBN: 0080459560 Category : Technology & Engineering Languages : en Pages : 409
Book Description
Switch-Mode Power Converters introduces an innovative, highly analytical approach to symbolic, closed-form solutions for switched-mode power converter circuits. This is a highly relevant topic to power electronics students and professionals who are involved in the design and analysis of electrical power converters. The author uses extensive equations to explain how solid-state switches convert electrical voltages from one level to another, so that electronic devices (e.g., audio speakers, CD players, DVD players, etc.) can use different voltages more effectively to perform their various functions. Most existing comparable books published as recently as 2002 do not discuss closed-loop operations, nor do they provide either DC closed-loop regulation equations or AC loop gain (stability) formulae. The author Wu, a leading engineer at Lockheed Martin, fills this gap and provides among the first descriptions of how error amplifiers are designed in conjunction with closed-loop bandwidth selection. BENEFIT TO THE READER: Readers will gain a mathematically rigorous introduction to numerous, closed-form solutions that are readily applicable to the design and development of various switch-mode power converters. Provides symbolic, closed-form solutions for DC and AC studies Provides techniques for expressing close-loop operation Gives readers the ability to perform closed-loop regulation and sensitivity studies Gives readers the ability to design error amplifiers with precision Employs the concept of the continuity of states in matrix form Gives accelerated time-domain, steady-state studies using Laplace transform Gives accelerated time-domain studies using state transition Extensive use of matrix, linear algebra, implicit functions, and Jacobian determinants Enables the determination of power stage gain that otherwise could not be obtained
Author: Laurent Fribourg Publisher: John Wiley & Sons ISBN: 1118791622 Category : Technology & Engineering Languages : en Pages : 150
Book Description
This book presents correct-by-design control techniques for switching systems, using different methods of stability analysis. Switching systems are increasingly used in the electronics and mechanical industries; in power electronics and the automotive industry, for example. This is due to their flexibility and simplicity in accurately controlling industrial mechanisms. By adopting appropriate control rules, we can steer a switching system to a region centered at a desired equilibrium point, while avoiding “unsafe” regions of parameter saturation. The authors explain various correct-by-design methods for control synthesis, using different methods of stability and invariance analysis. They also provide several applications of these methods to industrial examples of power electronics. Contents 1. Control Theory: Basic Concepts. 2. Sampled Switched Systems. 3. Safety Controllers. 4. Stability Controllers. 5. Application to Multilevel Converters. 6. Other Issues: Reachability, Sensitivity, Robustness and Nonlinearity. About the Authors Laurent Fribourg is head of the LSV (Laboratoire Spécification et Vérification) and Scientific Coordinator of the Institut Farman, Institut Fédératif de Recherche CNRS, which brings together the expertise of five laboratories from ENS Cachan, in France, in the fields of modeling, simulation and validation of complex systems. He has published over 70 articles in international journals and reviewed proceedings of international conferences, in the domain of the theory of formal methods and their industrial applications. Romain Soulat is in the third year of his doctorate at the LSV at ENS Cachan in France, under the supervision of Laurent Fribourg. He is working on the modeling and verification of hybrid systems. In particular, his interests concern robustness in scheduling problems – especially as part of a collaborative project with EADS Astrium on the verification of a component in the launcher for the future Ariane 6 rocket. He has published 5 articles in reviewed proceedings of international conferences.
Author: Siew-Chong Tan Publisher: ISBN: 9781138075498 Category : Switching power supplies Languages : en Pages : 0
Book Description
This reference provides a through analysis of sliding mode control principles, their application to power converters, and the practical realization of such controllers. Bridging the gap between power electronics and control theory, it presents a detailed description of the various theories, operating principles, and information relevant to the state of the art and the current development of sliding mode controllers and their applications to power converters. The book also reviews traditional and modern implementation techniques of sliding mode control for power converters--covering pulse-width modulation as well as conventional hysteresis modulation.
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Author: Xinbo Ruan
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Author: Simon Ang
Author: Institute of Electrical and Electronics Engineers
Author: Keng C. Wu
Author: Laurent Fribourg
Author: Siew-Chong Tan