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Author: Manish Bhardwaj (Electrical engineer) Publisher: ISBN: Category : Electric current converters Languages : en Pages :
Book Description
In power electronic applications, frequency response analysis (FRA) data is used to analyze the plant, design the control and verify the control design. Traditionally, external equipment is used to measure the frequency response by breaking the feedback path and injecting signals inside the closed loop system. This limits the use of FRA to design time of the converter. Recently in-circuit FRA measurement techniques have been presented. However, most techniques so far have required either special hardware to run, like FPGA, or required host processing power to do the complete computation. The aim of this research is to: • Design an in-circuit frequency response measurement algorithm that can run in a cycle efficient manner without any host computation requirements and is easily embedded into a commercial microcontroller used for controlling the power stage. • Highlight the constraints and assumptions under which in-circuit FRA can work, along with limits of in-circuit FRA such as noise performance and frequency bands. • Develop and demonstrate use of the designed in-circuit FRA on DC-DC, AC-DC and DC-AC converters, proving and highlighting the wide applicability of the developed technique for rapid control design. • Apply the developed in-circuit FRA for monitoring and diagnostic applications, showcasing applicability for extending capabilities with digital control of power converters.
Author: Manish Bhardwaj (Electrical engineer) Publisher: ISBN: Category : Electric current converters Languages : en Pages :
Book Description
In power electronic applications, frequency response analysis (FRA) data is used to analyze the plant, design the control and verify the control design. Traditionally, external equipment is used to measure the frequency response by breaking the feedback path and injecting signals inside the closed loop system. This limits the use of FRA to design time of the converter. Recently in-circuit FRA measurement techniques have been presented. However, most techniques so far have required either special hardware to run, like FPGA, or required host processing power to do the complete computation. The aim of this research is to: • Design an in-circuit frequency response measurement algorithm that can run in a cycle efficient manner without any host computation requirements and is easily embedded into a commercial microcontroller used for controlling the power stage. • Highlight the constraints and assumptions under which in-circuit FRA can work, along with limits of in-circuit FRA such as noise performance and frequency bands. • Develop and demonstrate use of the designed in-circuit FRA on DC-DC, AC-DC and DC-AC converters, proving and highlighting the wide applicability of the developed technique for rapid control design. • Apply the developed in-circuit FRA for monitoring and diagnostic applications, showcasing applicability for extending capabilities with digital control of power converters.
Author: Marian K. Kazimierczuk Publisher: John Wiley & Sons ISBN: 1118585860 Category : Religion Languages : en Pages : 632
Book Description
This book is devoted to resonant energy conversion in power electronics. It is a practical, systematic guide to the analysis and design of various dc-dc resonant inverters, high-frequency rectifiers, and dc-dc resonant converters that are building blocks of many of today's high-frequency energy processors. Designed to function as both a superior senior-to-graduate level textbook for electrical engineering courses and a valuable professional reference for practicing engineers, it provides students and engineers with a solid grasp of existing high-frequency technology, while acquainting them with a number of easy-to-use tools for the analysis and design of resonant power circuits. Resonant power conversion technology is now a very hot area and in the center of the renewable energy and energy harvesting technologies.
Author: Luca Corradini Publisher: John Wiley & Sons ISBN: 1119025370 Category : Technology & Engineering Languages : en Pages : 368
Book Description
This book is focused on the fundamental aspects of analysis, modeling and design of digital control loops around high-frequency switched-mode power converters in a systematic and rigorous manner Comprehensive treatment of digital control theory for power converters Verilog and VHDL sample codes are provided Enables readers to successfully analyze, model, design, and implement voltage, current, or multi-loop digital feedback loops around switched-mode power converters Practical examples are used throughout the book to illustrate applications of the techniques developed Matlab examples are also provided
Author: Trevor Chase Smith Publisher: ISBN: Category : Digital control systems Languages : en Pages : 148
Book Description
"In the field of power electronics, designers are constantly researching new methods to improve efficiency while optimizing dynamic performance. As communication technologies progress we are more often dealing with systems of increasing speed and complexity. For instance, from 1991 to 2013 we have observed the mobile broadband communication sector evolve from ~230 Kbits/s (2G) speeds to ~100 Mbits/s (4G LTE), a 430% increase in communication speed. In contrast, we have not observed the same evolutionary development in industrial power converters. Most switch-mode power supplies are still manufactured for 100 KHz to 800 KHz operating frequencies. The main reason for this is that most electrical devices only require steady-state DC power, so high speed conversion performance is largely unnecessary. But as size expectations for portable electronic devices continue to decrease, the only way to meet future demand is to realize power electronics that operate at much higher switching frequencies. Furthermore there is increasing demand to improve the transient response requirements in processor-based systems and achieve practical envelope tracking in RF communication systems. The most straightforward method of increasing the dynamic response for these systems is to increase the switching frequency of the power electronics in a sustainable and coherent manner."--Abstract.
Author: Lei Gu (Researcher in power electronics) Publisher: ISBN: Category : Languages : en Pages :
Book Description
Compact and efficient high-frequency power converters and amplifiers are needed in a variety of applications, including base stations, mobile devices, and medical equipment. The ever-growing need for a smaller size, longer battery life, and lower cost introduces challenging design considerations for radio-frequency power converters. Today, these radio-frequency resonant converters use harmonic tuning to shape the voltage or current waveform of the switching device, with the primary goals of reducing device stress and increasing achievable efficiency. Although harmonic-tuned resonant converters can be very compact and efficient for a certain condition, significant challenges remain to widespread adoption, including limited high-efficiency range, complicated design procedures, and higher device stress compared with conventional approaches. This thesis presents circuit techniques that can extend the voltage, frequency, and efficiency ranges of radio-frequency power converters and provides more straightforward analysis and easy-to-implement design procedures. This thesis first presents a multi-resonant gate driver circuit developed using the harmonic wave-shaping technique that significantly reduces the high-frequency gate driving losses for Si and SiC MOSFETs. By controlling different harmonic components of an ideal square wave, we can resonantly shape a quasi-square voltage waveform at the gate. This gate driver is simple to control and has a low component count. Compared with a sine wave gate signal, this method reduces the transition time between the MOSFET is fully enhanced and turned-off, driving down the switching losses. Compared with similar multi-resonant drivers that are self-oscillating, this driver reduces the long start-up time required to reach steady-state. Intuitive design methodologies based on the frequency-domain plot are introduced. Using this technique, we are able to resonantly drive a Si MOSFET at 20 MHz and recycle 60% of the hard-switching gate-driving loss. We also demonstrate this driver on a SiC MOSFET switching at 30 MHz and save 80% of the hard-switching loss. Modern applications demand power converters to maintain a constant voltage output with high efficiency across significant load variation. This thesis presents a bidirectional dc-dc converter that enables efficient fixed-ratio voltage conversion at tens of megahertz. By selecting a proper matching network for the intermediate gain stage, we address multiple challenges simultaneously; a) replacing a lossy passive diode with a more efficient active transistor, b) maintaining efficient soft-switching operation, and c) a constant voltage conversion ratio over a wide load range. A 64 MHz, 12 W, 36 V-to-12 V prototype converter with 75% peak efficiency verifies the operation of the structure. An interleaved configuration is then proposed to improve the efficiency and transient performance of a single-phase structure. A 13.56 MHz, 210 V-to-30 V prototype converter with 90% peak efficiency at 200 W demonstrates the advantages of this proposed structure. RF power amplifiers underpin many systems that support our modern infrastructure. The Class EF and E/F family of harmonic-tuned switch-mode amplifiers have simple gate drives, reduced voltage stress, and higher output power capabilities than a conventional Class E circuit. To best utilize the performance potential of this family of circuits, this thesis presents a novel push-pull Phi2 (EF2) amplifier using interleaving and series-stacking techniques, denoted as a PPT Phi2 circuit. This series-stacked PPT Phi2 circuit combines all of the main advantages of different topologies, like the simplicity of gate driving, highest cut-off frequency, lowest voltage stress, and load-invariant operation. A compact 6.78 MHz, 100 V, 300 W prototype converter is demonstrated. Using lowcost Si devices, the prototype converter achieves 96% peak total efficiency and maintains above 94.5% drain efficiency across a wide range of voltage and power. This new series-stacked PPT F2 RF amplifier doubles the maximum operating frequency and voltage range of a Class EF or E/F amplifier with benefits in many modern applications that require high-frequency high-power RF signals, like wireless charging for electric vehicles, plasma RF drives, and nuclear magnetic resonance (NMR) spectroscopy.
Author: Bob Dobkin Publisher: Newnes ISBN: 0123979021 Category : Technology & Engineering Languages : en Pages : 1269
Book Description
Analog circuit and system design today is more essential than ever before. With the growth of digital systems, wireless communications, complex industrial and automotive systems, designers are being challenged to develop sophisticated analog solutions. This comprehensive source book of circuit design solutions aids engineers with elegant and practical design techniques that focus on common analog challenges. The book’s in-depth application examples provide insight into circuit design and application solutions that you can apply in today’s demanding designs. This is the companion volume to the successful Analog Circuit Design: A Tutorial Guide to Applications and Solutions (October 2011), which has sold over 5000 copies in its the first 6 months of since publication. It extends the Linear Technology collection of application notes, which provides analog experts with a full collection of reference designs and problem solving insights to apply to their own engineering challenges Full support package including online resources (LTSpice) Contents include more application notes on power management, and data conversion and signal conditioning circuit solutions, plus an invaluable circuit collection of reference designs
Author: Miguel Castilla Publisher: IET ISBN: 1849198225 Category : Technology & Engineering Languages : en Pages : 457
Book Description
Control circuits are a key element in the operation and performance of power electronics converters. This book describes practical issues related to the design and implementation of these control circuits, and is divided into three parts - analogue control circuits, digital control circuits, and new trends in control circuits.
Author: Pavle Boškoski Publisher: Springer ISBN: 3319533908 Category : Technology & Engineering Languages : en Pages : 90
Book Description
This book offers a review of electrochemical impedance spectroscopy (EIS) and its application in online condition monitoring of electrochemical devices, focusing on the practicalities of performing fast and accurate EIS. The first part of the book addresses the theoretical aspects of the fast EIS technique, including stochastic excitation signals, time-frequency signal processing, and statistical analysis of impedance measurements. The second part presents an application of the fast EIS technique for condition monitoring and evaluates the performance of the proposed fast EIS methodology in three different types of electrochemical devices: a Li-ion battery, a Li-S cell, and a polymer electrolyte membrane (PEM) fuel cell. Uniquely, in addition to theoretical aspects the book provides practical guidelines for implementation, commissioning, and exploitation of EIS for condition monitoring of electrochemical devices, making it a valuable resource for practicing engineers as well as researchers.
Author: Manish Bhardwaj (Electrical engineer)
Author: Manish Bhardwaj (Electrical engineer)
Author: Marian K. Kazimierczuk
Author: Luca Corradini
Author: Trevor Chase Smith
Author: 
Author: Lei Gu (Researcher in power electronics)
Author: 
Author: Bob Dobkin
Author: Miguel Castilla
Author: Pavle Boškoski