A Frequency Response Based Approach to DC-DC Control Loop Design PDF Download

Author: Jack Andrew Redilla
Publisher:
ISBN:
Category : DC-to-DC converters
Languages : en
Pages : 85

View

Book Description
This thesis encompasses control theory, mathematical models and practical methods for developing high performance control loops for compact DC-DC power converters. In this research we compare an existing hardware control loop design developed through traditional empirical tuning methods to a control loop established by a proposed systematic design approach. To address the many problems of ad-hoc controller design for DC-DC converters, we develop a procedure utilizing tools from frequency domain analysis and loop shaping techniques. This design approach is used to ensure control loop stability and to verify improved loop performance. This systematic control loop design procedure can be utilized for future development work to create improved DC-DC converter control loops. Our goal is to turn the art of traditional empirical tuning into a science by creating a systematic process utilizing tools that can quantify and define DC-DC converter control loop performance. Mathematical simulations are used to verify the control loop models before hardware verification. Finally we compare resulting performance of the control loop circuitry designed with the proposed approach to that of the empirical approach.

Author: Luca Corradini
Publisher: John Wiley & Sons
ISBN: 1119025397
Category : Technology & Engineering
Languages : en
Pages : 357

View

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: Farzin Asadi
Publisher: Springer Nature
ISBN: 3031025024
Category : Technology & Engineering
Languages : en
Pages : 229

View

Book Description
DC-DC converters have many applications in the modern world. They provide the required power to the communication backbones, they are used in digital devices like laptops and cell phones, and they have widespread applications in electric cars, to just name a few. DC-DC converters require negative feedback to provide a suitable output voltage or current for the load. Obtaining a stable output voltage or current in presence of disturbances such as: input voltage changes and/or output load changes seems impossible without some form of control. This book tries to train the art of controller design for DC-DC converters. Chapter 1 introduces the DC-DC converters briefly. It is assumed that the reader has the basic knowledge of DC-DC converter (i.e., a basic course in power electronics). The reader learns the disadvantages of open loop control in Chapter 2. Simulation of DC-DC converters with the aid of Simulink® is discussed in this chapter as well. Extracting the dynamic models of DC-DC converters is studied in Chapter 3. We show how MATLAB® and a software named KUCA can be used to do the cumbersome and error-prone process of modeling automatically. Obtaining the transfer functions using PSIM® is studied as well. These days, softwares are an integral part of engineering sciences. Control engineering is not an exception by any means. Keeping this in mind, we design the controllers using MATLAB® in Chapter 4. Finally, references are provided at the end of each chapter to suggest more information for an interested reader. The intended audiencies for this book are practice engineers and academians.

Author: Manuel Arias
Publisher: MDPI
ISBN: 3036515631
Category : Technology & Engineering
Languages : en
Pages : 402

View

Book Description
In this book, 20 papers focused on different fields of power electronics are gathered. Approximately half of the papers are focused on different control issues and techniques, ranging from the computer-aided design of digital compensators to more specific approaches such as fuzzy or sliding control techniques. The rest of the papers are focused on the design of novel topologies. The fields in which these controls and topologies are applied are varied: MMCs, photovoltaic systems, supercapacitors and traction systems, LEDs, wireless power transfer, etc.

Author: Keng Chih Wu
Publisher: Springer Science & Business Media
ISBN: 1461560217
Category : Technology & Engineering
Languages : en
Pages : 242

View

Book Description
For the first time in power electronics, this comprehensive treatment of switch-mode DC/DC converter designs addresses many analytical closed form equations such as duty cycle prediction, output regulation, output ripple, control loop-gain, and steady state time-domain waveform. Each of these equations are given various topologists and configurations, including forward, flyback, and boost converters. Pulse Width Modulated DC/DC Converters begins with a detailed approach to the quiescent operating locus of a power plant under open-loop. The reader is then led through other supporting circuits once again in the quiescent condition. These exercises result in the close-loop formulations of the subject system, providing designers with the ability to study the sensitivities of a system against disturbances. With the quiescent conditions well established, the book then guides the reader further into the territories of system stability where small signal behaviors are explored. Finally, some important large signal time-domain studies cap the treatment. Some distinctive features of this book include: *detailed coverage of dynamic close-loop converter simulations using only personal computer and modern mathematical software *Steady-state, time-domain analysis based on the concept of continuity of states Voltage-mode and current-mode control techniques and their differences of merits A detailed description on setting up different equations for DC/DC converters'simulation using only PC

Author: Marco Cupelli
Publisher: Academic Press
ISBN: 0128132213
Category : Technology & Engineering
Languages : en
Pages : 304

View

Book Description
Modern Control of DC-Based Power Systems: A Problem-Based Approach addresses the future challenges of DC Grids in a problem-based context for practicing power engineers who are challenged with integrating DC grids in their existing architecture. This reference uses control theory to address the main concerns affecting these systems, things like generation capacity, limited maximum load demands and low installed inertia which are all set to increase as we move towards a full renewable model. Offering a new approach for a problem-based, practical approach, the book provides a coordinated view of the topic with MATLAB®, Simulink® files and additional ancillary material provided. Includes Simulink® Files (of examples and for lab training classes) and MATLAB® files Presents video slides to support the problem-based approach to understanding DC Power System control and application Provides stability analysis of DC networks and examples of common stability problems

Author: VaraPrasad Arikatla
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 152

View

Book Description
Tight regulation of the output voltage is often required in many power supply applications, despite the highly dynamic nature of the loads. This is conventionally obtained by the design of high bandwidth feedback loop or recently by using adaptive control methods. The control loop is designed with specified safe bandwidth and gain and phase margins such that it maintains stable operation under variable conditions and parameters. However, this results in a compromise between achievable dynamic performance and robustness of control loop. The large variations in operating points and load makes the system design challenging. The tight regulation requirements, in addition to size and weight requirements, are getting stricter by time, which makes it necessary to investigate new control concepts in order to meet these requirements. Not meeting the tight regulation requirements may result in either the malfunctioning of the device (load) being powered or the destruction of that device. This work focuses on the development and implementation of adaptive control methods that result in the improvement of the dynamic performance of power converter, by utilizing the flexibility of digital controllers to realize advanced control schemes. Four different methods are proposed that improve the dynamic performance of converter without compromising the steady-state performance. A Sensorless Adaptive Voltage Positioning (SLAVP) control scheme is proposed in Chapter 2, in order to realize Adaptive Voltage Positioning (AVP) control without the need for load or inductor current sensing and high-resolution high-speed Analog-to-Digital Converter (ADC) sampling. The SLAVP control law utilizes the readily available error signal of the conventional voltage-mode closed-loop compensated controller, or in other words the duty cycle of a DC-DC buck converter, in order to realize AVP control. The elimination of the need for high-speed and accurate sensing and sampling of currents using the proposed SLAVP control reduces the size and cost of the digital controller, reduces the power losses associated with current sensing and sampling, and simplifies hardware design, apart from improving dynamic performance. In Chapter 3, an Adaptive Digital PID (AD-PID) controller scheme is proposed. The controller adaptively adjusts the integral constant (K_i) and the proportional constant (K_p) of the compensator following a new control law. The control law is a function of the magnitude change in the error signal and its peak value during dynamic transients. The proposed AD-PID controller adaptively detects the peak value of the error signal which is a function of the transient nature and magnitude and utilize it in the control law such that no ocillations are generated as a result of the adaptive operation. As a result, the dynamic output voltage deviation and the settling time of the output voltage are reduced. A novel Compensator Error Observe and Modulate method (CEO & M) for online closed-loop-compensator auto-tuning of digital power controller is proposed in Chapter 4. The proposed method is relatively simple and does not require the knowledge and/or measurement of the power stage or closed-loop frequency response. Moreover, the proposed method does not depend on conventional design methods and the associated rule of thumb design criteria in order to tune closed-loop feedback controllers of power converter for high, and possibly optimum, dynamic performance. Furthermore, two approaches for dynamic variable switching frequency digital control scheme under dynamic transients are proposed in Chapter 5 in order to improve the dynamic performance of the DC-DC switching power converter. The proposed controller varies the switching frequency of the converter, higher or lower than the steady-state frequency, during the transient as a function of peak and magnitude of error signal depending on the amount and type of the transient. Finally, Chapter 6 summarizes this work and provides conclusions before discussing future related research direction.

Author: Bob Dobkin
Publisher: Newnes
ISBN: 0123979021
Category : Technology & Engineering
Languages : en
Pages : 1269

View

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: Akshay Kumar Rathore
Publisher: CRC Press
ISBN: 1000925870
Category : Technology & Engineering
Languages : en
Pages : 285

View

Book Description
This book explains the basic and advanced technology behind the Power Electronics Converters for EV charging, and their significant developments, and introduces the Grid Impact issues that underpin the grid integration of electric vehicles. Advanced Concepts and Technologies for Electric Vehicles reviews state-of-the-art and new configurations and concepts of more electric vehicles and EV charging, mitigating the impact of EV charging on the power grid, and technical considerations of EV charging infrastructures. The book considers the environmental benefits and advantages of electric vehicles and their component devices. It includes case studies of different power electronic converters used for charging EVs. It offers a review of PFC-based AC chargers, WBG-based chargers, and Wireless chargers. The authors also explore multistage charging systems and their possible implementations. The book also examines the challenges and opportunities posed by the progressive integration of electric drive vehicles on the power grid and reported solutions for their mitigation. The book is intended for professionals, researchers, and engineers in the electric vehicle industry as well as advanced students in electrical engineering who benefit from this comprehensive coverage of electric vehicle technology. Readers can get an in-depth insight into the technology deployment in EV transportation and utilize that knowledge to develop novel ideas in the EV area.

Author: Mohsen Mirtalebi
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages :

View

Book Description
ABSTRACT: The backbone of simulation is nothing but mathematical equations from simple linearization method to solving complex differential equations. Although simulating a real system with realistic outcomes is a hard task to come by but minimizing the amount of rework required after design makes it a very desirable method to see results before building a device. The scope of this thesis paper is to bring to the light the concept of simulating power electronics devices purely in form of equations to reduce the cost of development, to speed up the time to market of the product and to establish design benchmarks to guide the designer to the right direction. The thesis topic started as a simple application of converting an analog-based control of DC-DC converter to a DSP-based digital control, but it quickly developed into control hardware in the loop project. This shows how powerful and effective a DSP-based simulation can perform. This and a demand from the application engineering perspective made the author to explore different methods that can be even more effective. As the author researched around the idea, he realized there has been some work done in the past but nothing to the effect of utilizing a DSP to simulate DC-DC converters. Therefore the last part of this thesis is to study feasibility of utilizing DSP as a real time simulator of power electronics devices especially high frequency DC-DC converters. Although the results on the last part of the project are not definitive but there are very strong signs showing that in the future there is very strong potential of DSP-based real time simulation for power electronics devices. This along other advantages that real time simulation can bring about such as, speed of simulation in opposed to a slow, off-line, and computer-based simulation, significant cost reduction, portability, and creating a guided-design are a few advantages to name.