Download or read book New Current Sensing Solutions for Low cost High power density Digitally Controlled Power Converters written by Silvio Ziegler and published by . This book was released on 2009 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] This thesis studies current sensing techniques that are designed to meet the requirements for the next generation of power converters. Power converters are often standardised, so that they can be replaced with a model from another manufacturer without an expensive system redesign. For this reason, the power converter market is highly competitive and relies on cutting-edge technology, which increases power conversion efficiency and power density. High power density and conversion efficiency reduce the system cost, and thus make the power converter more attractive to the customer. Current sensing is a vital task in power converters, where the current information is required for monitoring and control purposes. In order to achieve the above-mentioned goals, existing current sensing techniques have to be improved in terms of cost, power loss and size. Simultaneously, current information needs to be increasingly available in digital form to enable digital control, and to allow the digital transmission of the current information to a centralised monitoring and control unit. All this requires the output signal of a particular current sensing technique to be acquired by an analogue-to-digital converter, and thus the output voltage of the current sensor has to be sufficiently large. This thesis thoroughly reviews contemporary current sensing techniques and identifies suitable techniques that have the potential to meet the performance requirements of the next-generation of power converters. After the review chapter, three novel current sensing techniques are proposed and investigated: 1) The usefulness of the resistive voltage drop across a copper trace, which carries the current to be measured, to detect electrical current is evaluated. Simulations and experiments confirm that this inherently lossless technique can measure high currents at reasonable measurement bandwidth, good accuracy and low cost if the sense wires are connected properly. 2) Based on the mutual inductance theory found during the investigation of the copper trace current sense method, a modification of the well-known lossless inductor current sense method is proposed and analysed. This modification involves the use of a coupled sense winding that significantly improves the frequency response. Hence, it becomes possible to accurately monitor the output current of a power converter with the benefits of being lossless, exhibiting good sensitivity and having small size. 3) A transformer based DC current sense method is developed especially for digitally controlled power converters. This method provides high accuracy, large bandwidth, electrical isolation and very low thermal drift. Overall, it achieves better performance than many contemporary available Hall Effect sensors. At the same time, the cost of this current sensor is significantly lower than that of Hall Effect current sensors. A patent application has been submitted. .... The current sensing techniques have been studied by theory, hardware experiments and simulations. In addition, the suitability of the detection techniques for mass production has been considered in order to access the ability to provide systems at low-cost.
Download or read book Integrated Wide Bandwidth Current Sensing written by Tobias Funk and published by Springer Nature. This book was released on 2020-09-04 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with a single-source reference to current sensing integrated circuit design. It is written in handbook style, including systematic guidelines and implementation examples. The authors focus on the implementation of wide-bandwidth current sensing on a single microchip, toward usage in applications such as sensing, control and optimization of the energy flow in growth areas like industrial electronics, renewable energies, smart grids, electromobility and the Internet of Things. Provides readers with a comprehensive, all-in-one source for current sensing integrated circuit design, including implementation examples; Discusses modeling and optimization of on-chip Rogowski coil and Hall sensor in both lateral and vertical orientation; Includes noise reduction techniques, such as auto-zeroing and chopping; Covers open-loop and closed-loop sensor front-end design; Presents the first on-chip current sensor with a planar coil placed besides a power line to measure internal signal currents and the first off-chip current sensor with a helix-shaped coil for external signal currents in the multi-MHz region.
Download or read book Applications of Quasi fixed Frequency Current mode Power Converters written by Yue Wen and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Power Converter with Digital Filter Feedback Control written by Keng C. Wu and published by Academic Press. This book was released on 2016-02-01 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power Converter with Digital Filter Feedback Control presents a logical sequence that leads to the identification, extraction, formulation, conversion, and implementation for the control function needed in electrical power equipment systems. This book builds a bridge for moving a power converter with conventional analog feedback to one with modern digital filter control and enlists the state space averaging technique to identify the core control function in analytical, close form in s-domain (Laplace). It is a useful reference for all professionals and electrical engineers engaged in electrical power equipment/systems design, integration, and management. Offers logical sequences to identification, extraction, formulation, conversion, and implementation for the control function needed Contains step-by-step instructions on how to take existing analog designed power processors and move them to the digital realm Presents ways to extract gain functions for many power converters' power processing stages and their supporting circuitry
Download or read book Input Voltage Ripple Based Sensorless Current Sharing Auto tuning Controller for Multiphase DC DC Converters written by Wangxin Huang and published by . This book was released on 2015 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase power converter topology has been widely adopted for Point-of-Load (PoL) converter application. To achieve a high-performance multiphase converter design, several design considerations must be taken into account during the design phase. These factors include but are not limited to high power density (smaller size), fast transient response and equal current sharing which are introduced in Chapter 1. Current sharing, as a key design consideration to ensure reliable operation of multiphase DC-DC converter, is further explored in this work. Equal current sharing control loop is typically required for multiphase converter in order to prevent inductor current saturation and overstressing the devices in certain phases. Several conventional current sharing control schemes are first reviewed in Chapter 2. The major drawback of these schemes is the need for accurate current sensing for each phase, which causes the performance of the current sharing to be highly sensitive to the accuracy of current sensing in addition to increased cost and complexity. To address the need for accurate current sensing, a new digital sensorless current sharing control scheme is proposed and developed in this work. It is based on auto-tuning the duty cycle value for each phase while observing the input capacitor voltage of the multiphase converter. The theoretical basis/observation of the proposed concept is presented and mathematically verified in Chapter 2 followed by an introduction of the operation of the proposed controller. In addition to eliminating all of the current sensors, the proposed controller eliminates the impact of voltage sensing inaccuracies on the performance of current sharing. The simulation verification of the theoretical basis and operation of the proposed controller is performed by using MATLAB®/SIMULINK® software package. The simulation model is introduced and the simulation results are presented in Chapter 3. A proof-of-concept experimental prototype set-up is first introduced in Chapter 4. The design and implementation of the proposed controller are then covered in details. The periodic and continuous auto-tuning operations are demonstrated under both steady-state and load transient conditions. The experimental results are presented and discussed to further validate the proposed controller. Finally, some directions for future work are given.
Download or read book Resonant Power Converters written by Marian K. Kazimierczuk and published by Wiley-Interscience. This book was released on 1995-05 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resonant power converters have many applications in the computer industry, telecommunications and in industrial electronics. Their advantage over traditional converters lies in their ability to transform power at very high frequencies. This book discusses resonant power converters.
Download or read book An Integrated Lossless and Accurate Current sensing Technique for High performance Switching Regulators written by H. Pooya Forghani-zadeh and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Switching power converters are an indispensable part of every battery-operated consumer electronic product, nourishing regulated voltages to various subsystems. In these circuits, sensing the inductor current is not only necessary for protection and control but also is critical to be done in a lossless and accurate fashion for state-of-the-art advanced control techniques, which are devised to optimize transient response, increase the efficiency over a wide range of loads, eliminate off-chip compensation networks, and integrate the power inductor. However, unavailability of a universal, integrable, lossless, and accurate current-sensing technique impedes the realization of those advanced techniques and limit their applications. Unfortunately, use of a conventional series sense resistor is not recommended in high-performance, high-power switching regulators where more than 90% efficiency is required because of their high current levels. A handful of lossless current-sensing techniques are available but their accuracies are significantly lower than the traditional sense resistor scheme. Among available lossless but not accurate techniques, an off-chip, filter-based method that uses a tuned filter across the inductor to estimate current flow and its accuracy is dependent on the inductance and its equivalent series resistance (ESR) was selected for improvement because of its inherent continuous and low-noise operation. A schemes is proposed to adapt the filter technique for integration by automatically adjusting bandwidth and gain of an on-chip programmable gm-C filter to the off-chip power inductor during the system start-up through measuring the inductance and its ESR with on-chip generated test currents. The IC prototype in AMI2s 0.5-um CMOS process achieved overall DC and AC gain errors of 8% and 9%, respectively, at 0.8 A DC load and 0.2 A ripple currents for inductors from 4 uH-14 uH and ESR from 48 mOhm to 384 mOhm when lossless, state-of-the-art schemes achieve 20640% error and only when the nominal specifications of power component (power MOSFET or inductor) are known. Moreover, the proposed circuit improved the efficiency of a test bed current-mode controlled switching regulator by more than 2.6% at 0.8 A load compared to the traditional sense resistor technique with a 50 mOhm sense resistor.
Download or read book Digital Control of High Frequency Switched Mode Power Converters written by Luca Corradini and published by John Wiley & Sons. This book was released on 2015-07-10 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book ISIE written by and published by . This book was released on 1997 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fluxgate Magnetometer written by Fritz Primdahl and published by . This book was released on 1979 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital Signal Processing in Power Electronics Control Circuits written by Krzysztof Sozański and published by Springer. This book was released on 2017-05-10 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revised and extended second edition covers problems concerning the design and realization of digital control algorithms for power electronics circuits using digital signal processing (DSP) methods. This book discusses signal processing, starting from analog signal acquisition, through conversion to digital form, methods of filtration and separation, and ending with pulse control of output power transistors. The book is focused on two applications for the considered methods of digital signal processing, a three-phase shunt active power filter and a digital class-D audio power amplifier. The book bridges the gap between power electronics and digital signal processing. Many control algorithms and circuits for power electronics in the current literature are described using analog transmittances. This may not always be acceptable, especially if half of the sampling frequencies and half of the power transistor switching frequencies are close to the band of interest. Therefore in this book, a digital circuit is treated as a digital circuit with its own peculiar characteristics, rather than an analog circuit. This helps to avoid errors and instability. This edition includes a new chapter dealing with selected problems of simulation of power electronics systems together with digital control circuits. The book includes numerous examples using MATLAB and PSIM programs.
Download or read book Analysis and Design of Analog Integrated Circuits written by Paul R. Gray and published by John Wiley & Sons. This book was released on 2024-01-04 with total page 981 pages. Available in PDF, EPUB and Kindle. Book excerpt: ANALYSIS AND DESIGN OF ANALOG INTEGRATED CIRCUITS Authoritative and comprehensive textbook on the fundamentals of analog integrated circuits, with learning aids included throughout Written in an accessible style to ensure complex content can be appreciated by both students and professionals, this Sixth Edition of Analysis and Design of Analog Integrated Circuits is a highly comprehensive textbook on analog design, offering in-depth coverage of the fundamentals of circuits in a single volume. To aid in reader comprehension and retention, supplementary material includes end of chapter problems, plus a Solution Manual for instructors. In addition to the well-established concepts, this Sixth Edition introduces a new super-source follower circuit and its large-signal behavior, frequency response, stability, and noise properties. New material also introduces replica biasing, describes and analyzes two op amps with replica biasing, and provides coverage of weighted zero-value time constants as a method to estimate the location of dominant zeros, pole-zero doublets (including their effect on settling time and three examples of circuits that create doublets), the effect of feedback on pole-zero doublets, and MOS transistor noise performance (including a thorough treatment on thermally induced gate noise). Providing complete coverage of the subject, Analysis and Design of Analog Integrated Circuits serves as a valuable reference for readers from many different types of backgrounds, including senior undergraduates and first-year graduate students in electrical and computer engineering, along with analog integrated-circuit designers.
Download or read book F S Index United States Annual written by and published by . This book was released on 2007 with total page 1424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the IEEE International Symposium on Industrial Electronics written by and published by . This book was released on 1997 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Digital Consumer Technology Handbook written by Amit Dhir and published by Elsevier. This book was released on 2004-04-30 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: The consumer electronics market has never been as awash with new consumer products as it has over the last couple of years. The devices that have emerged on the scene have led to major changes in the way consumers listen to music, access the Internet, communicate, watch videos, play games, take photos, operate their automobiles—even live. Digital electronics has led to these leaps in product development, enabling easier exchange of media, cheaper and more reliable products, and convenient services. This handbook is a much-needed, comprehensive engineering guide to the dynamic world of today's digital consumer electronics. It provides complete details on key enabling technologies, standards, delivery and reception systems, products, appliances and networking systems. Each chapter follows a logical progression from a general overview of each device, to market dynamics, to the core technologies and components that make up that particular product. The book thoroughly covers all of the key digital consumer product categories: digital TV, digital audio, mobile communications devices, gaming consoles, DVD players, PCs and peripherals, display devices, digital imaging devices, web terminals and pads, PDAs and other handhelds, screenphones/videophones, telematics devices, eBooks and readers, and many other current and future products.To receive a FREE daily newsletter on displays and consumer electronics, go to: http://www.displaydaily.com/·Surveys crucial engineering information for every digital consumer product category, including cell phones, digital TVs, digital cameras, PDAs and many more—the only reference available to do so·Has extremely broad market appeal to embedded systems professionals, including engineers, programmers, engineering managers, marketing and sales personnel—1,000,000+ potential readers·Helps engineers and managers make the correct design decisions based on real-world data
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Power Electronics Handbook written by Muhammad H. Rashid and published by Elsevier. This book was released on 2023-09-27 with total page 1472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power Electronics Handbook, Fifth Edition delivers an expert guide to power electronics and their applications. The book examines the foundations of power electronics, power semiconductor devices, and power converters, before reviewing a constellation of modern applications. Comprehensively updated throughout, this new edition features new sections addressing current practices for renewable energy storage, transmission, integration, and operation, as well as smart-grid security, intelligent energy, artificial intelligence, and machine learning applications applied to power electronics, and autonomous and electric vehicles. This handbook is aimed at practitioners and researchers undertaking projects requiring specialist design, analysis, installation, commissioning, and maintenance services. - Provides a fully comprehensive work addressing each aspect of power electronics in painstaking depth - Delivers a methodical technical presentation in over 1500 pages - Includes 50+ contributions prepared by leading experts - Offers practical support and guidance with detailed examples and applications for lab and field experimentation - Includes new technical sections on smart-grid security and intelligent energy, artificial intelligence, and machine learning applications applied to power electronics and autonomous and electric vehicles - Features new chapter level templates and a narrative progression to facilitate understanding
