High Current Density Low Voltage Isolated Dc Dc Converters With Fast Transient Response

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High Current Density Low Voltage Isolated DC-DC Converters with Fast Transient Response

Author : Liangbin Yao
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis High Current Density Low Voltage Isolated DC-DC Converters with Fast Transient Response by : Liangbin Yao

Download or read book High Current Density Low Voltage Isolated DC-DC Converters with Fast Transient Response written by Liangbin Yao and published by . This book was released on 2007 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid development of microprocessor and semiconductor technology, industry continues to update the requirements for power supplies. For telecommunication and computing system applications, power supplies require increasing current level while the supply voltage keeps decreasing. For example, the Intel's CPU core voltage decreased from 2 volt in 1999 to 1 volt in 2005 while the supply current increased from 20A in 1999 to up to 100A in 2005. As a result, low-voltage high-current high efficiency dc-dc converters with high power-density are demanded for state-of-the-art applications and also the future applications. Half-bridge dc-dc converter with current-doubler rectification is regarded as a good topology that is suitable for high-current low-voltage applications. There are three control schemes for half-bridge dc-dc converters and in order to provide a valid unified analog model for optimal compensator design, the analog state-space modeling and small signal modeling are studied in the dissertation and unified state-space and analog small signal model are derived. In addition, the digital control gains a lot of attentions due to its flexibility and re-programmability. In this dissertation, a unified digital small signal model for half-bridge dc-dc converter with current doubler rectifier is also developed and the digital compensator based on the derived model is implemented and verified by the experiments with the TI DSP chip. In addition, although current doubler rectifier is widely used in industry, the key issue is the current sharing between two inductors. The current imbalance is well studied and solved in non-isolated multi-phase buck converters, yet few discusse this issue in the current doubler rectification topology within academia and industry. This dissertation analyze the current sharing issue in comparison with multi-phase buck and one modified current doubler rectifier topology is proposed to achieve passive current sharing. The performance is evaluated with half bridge dc-dc converter; good current sharing is achieved without additional circuitry. Due to increasing demands for high-efficiency high-power-density low-voltage high current topologies for future applications, the thermal management is challenging. Since the secondary-side conduction loss dominates the overall power loss in low-voltage high-current isolated dc-dc converters, a novel current tripler rectification topology is proposed. Theoretical analysis, comparison and experimental results verify that the proposed rectification technique has good thermal management and well-distributed power dissipation, simplified magnetic design and low copper loss for inductors and transformer. That is due to the fact that the load current is better distributed in three inductors and the rms current in transformer windings is reduced. Another challenge in telecommunication and computing applications is fast transient response of the converter to the increasing slew-rate of load current change. For instance, from Intel's roadmap, it can be observed that the current slew rate of the age regulator has dramatically increased from 25A/uS in 1999 to 400A/us in 2005. One of the solutions to achieve fast transient response is secondary-side control technique to eliminate the delay of optocoupler to increase the system bandwidth. Active-clamp half bridge dc-dc converter with secondary-side control is presented and one industry standard 16th prototype is built and tested; good efficiency and transient response are shown in the experimental section. However, one key issue for implementation of secondary-side control is start-up. A new zero-voltage-switching buck-flyback isolated dc-dc converter with synchronous rectification is proposed, and it is only suitable for start-up circuit for secondary-side controlled converter, but also for house-keeping power supplies and standalone power supplies requiring multi-outputs.

High-density On-chip DC-DC Power Conversion

Author : Bumkil Lee
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (123 download)

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Book Synopsis High-density On-chip DC-DC Power Conversion by : Bumkil Lee

Download or read book High-density On-chip DC-DC Power Conversion written by Bumkil Lee and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern mobile devices have been developed with the trend towards improving performance, integrating further multiple functions in limited form factor, and providing long runtime. Therefore, high-density power converters are required to facilitate this trend, while maintaining fundamental features, such as high efficiency over the wide-load-range, fixed switching frequency, low EMI noise, high reliability, low latency, low-quiescent power consumption, and wide input voltage (VIN) for direct usage of the varied battery voltage. This dissertation describes advanced system architectures, control schemes, and circuit designs, which can overcome the design challenges to enhance power density of the DC-DC converters. First, the dissertation discusses achieving system-level miniaturization by improving the power distribution plan in the battery-operated mobile applications. To mitigate the design challenges, a 3-level converter is essential due to its half VIN swing, which allows direct supply connection with the varied battery voltage while using the thin-oxide devices, enabling power converter integration with another functional device on the same chip. Although the half VIN swing in the 3-level converter allows operating at high switching frequency, which induces small passives and fast response, the efficiency as well as VIN range reported in the published works was limited. To further improve the efficiency, a 20MHz all-NMOS 3-level converter is presented. To handle all-NMOS power switches even with varied VIN supply, such as battery, the isolated bootstrap circuit is proposed to mitigate the voltage charging issue in the 3-level high-side gate driving. Also, proposed is a precise sub-ns dead-time controller, which is integrated in the gate buffer stage, minimizing the dead-time power loss without sacrificing reliability. To deliver high power with tremendous current slew rate required in the mobile application processors, a 25 MHz, 4-phase power converter is presented. The converter employs a synchronized adaptive window hysteretic control to facilitate ultra-fast transient response and minimize output voltage (VO) undershoot and overshoot. Its inherent clock synchronization ability ensures current balancing among the phase sub-converters. The control is also capable of providing a wide range of programmable VO for dynamic voltage scaling, thereby efficiently saving system power. As the all-phase operation degrades the light-load efficiency, a 1-Cycle active phase count scheme is introduced to maintain high efficiency over a wide load range without degrading transient speed. To further integrate required design features for mobile applications, the hybrid digital-assisted double adaptive bound (DAB) converter is developed. The analog DAB controller achieves fast transient response, fixed switching frequency, high output regulation, and wide VIN supply in a compact structure. Combining the DAB control with a digital mode manager, the proposed hybrid converter provides four operation modes to further improve transient performance and wide-load range efficiency. Due to the single control loop assisted by the digital mode manager, the converter successfully utilizes fast and seamless mode transitions without any supply glitch.

High Efficiency Bi-directional DC-DC Converter with Matrix Transformer Isolation for Heavy Duty Hybrid Electric Vehicles

Author : Shubham Mungekar
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis High Efficiency Bi-directional DC-DC Converter with Matrix Transformer Isolation for Heavy Duty Hybrid Electric Vehicles by : Shubham Mungekar

Download or read book High Efficiency Bi-directional DC-DC Converter with Matrix Transformer Isolation for Heavy Duty Hybrid Electric Vehicles written by Shubham Mungekar and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Medium power DC-DC converter is an essential component in Hybrid Electric Vehicle (HEV) to achieve power transfer from High Voltage bus (HV) to Low Voltage bus (LV) and vice-versa. Dual Active Bridge (DAB) is among the most researched topology for medium and higher power converters with advantages such as bidirectional power transfer, high efficiency, high modularity, and high-power density. Multi-Objective Design Optimization with low converter loss and low converter volume as its objectives is used as a basis of parameters and components design. Integrated planar Matrix transformer is employed for galvanic isolation of the two voltage buses providing lower transformer losses compared to the traditional transformers. Peak Current mode control is implemented in DSP control card to ensure DC offset across the transformer is minimum as well as ensuring faster transient response in cascade with closed loop voltage control. The converter design is prototyped as a proof of concept, which can operate within a wide range of input voltages (400V-800V) and serves low-voltage high-current loads.

High Efficiency Non-isolated DC-DC Converters with Wide Voltage Gain Range for Renewable Energies

Author : Yun Zhang
Publisher : Springer Nature
ISBN 13 : 9819706483
Total Pages : 289 pages
Book Rating : 4.8/5 (197 download)

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Book Synopsis High Efficiency Non-isolated DC-DC Converters with Wide Voltage Gain Range for Renewable Energies by : Yun Zhang

Download or read book High Efficiency Non-isolated DC-DC Converters with Wide Voltage Gain Range for Renewable Energies written by Yun Zhang and published by Springer Nature. This book was released on with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Soft Commutation Isolated DC-DC Converters

Author : Ivo Barbi
Publisher : Springer
ISBN 13 : 3319961780
Total Pages : 325 pages
Book Rating : 4.3/5 (199 download)

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Book Synopsis Soft Commutation Isolated DC-DC Converters by : Ivo Barbi

Download or read book Soft Commutation Isolated DC-DC Converters written by Ivo Barbi and published by Springer. This book was released on 2018-08-27 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the operation and analysis of soft-commutated isolated DC–DC converters used in the design of high efficiency and high power density equipment. It explains the basic principles behind first- and second-order circuits with power switches to enable readers to understand the importance of these converters in high efficiency and high power density power supply design for residential, commercial, industrial and medical use as well as in aerospace equipment. With each chapter featuring a different power converter topology, the book covers the most important resonant converters, including series resonant converters; resonant LLC converters; soft commutation pulse width modulation converters; zero voltage switching; and zero current switching. Each topic is presented with full analysis, a showcase of the power stages of the converters, exercises and their solutions as well as simulation results, which mainly focus on the commutation analysis and output characteristic. This book is a valuable source of information for professionals working in power electronics, power conversion and design of high efficiency and high power density DC–DC converters and switch mode power supplies. The book also serves as a point of reference for engineers responsible for development projects and equipment in companies and research centers and a text for advanced students.

Advanced DC-DC Power Converters and Switching Converters

Author : Salvatore Musumeci
Publisher : MDPI
ISBN 13 : 303650446X
Total Pages : 188 pages
Book Rating : 4.0/5 (365 download)

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Book Synopsis Advanced DC-DC Power Converters and Switching Converters by : Salvatore Musumeci

Download or read book Advanced DC-DC Power Converters and Switching Converters written by Salvatore Musumeci and published by MDPI. This book was released on 2021-03-30 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, power electronics is an enabling technology in the energy development scenario. Furthermore, power electronics is strictly linked with several fields of technological growth, such as consumer electronics, IT and communications, electrical networks, utilities, industrial drives and robotics, and transportation and automotive sectors. Moreover, the widespread use of power electronics enables cost savings and minimization of losses in several technology applications required for sustainable economic growth. The topologies of DC–DC power converters and switching converters are under continuous development and deserve special attention to highlight the advantages and disadvantages for use increasingly oriented towards green and sustainable development. DC–DC converter topologies are developed in consideration of higher efficiency, reliable control switching strategies, and fault-tolerant configurations. Several types of switching converter topologies are involved in isolated DC–DC converter and nonisolated DC–DC converter solutions operating in hard-switching and soft-switching conditions. Switching converters have applications in a broad range of areas in both low and high power densities. The articles presented in the Special Issue titled "Advanced DC-DC Power Converters and Switching Converters" consolidate the work on the investigation of the switching converter topology considering the technological advances offered by innovative wide-bandgap devices and performance optimization methods in control strategies used.

Average Current-Mode Control of DC-DC Power Converters

Author : Marian K. Kazimierczuk
Publisher : John Wiley & Sons
ISBN 13 : 1119525659
Total Pages : 340 pages
Book Rating : 4.1/5 (195 download)

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Book Synopsis Average Current-Mode Control of DC-DC Power Converters by : Marian K. Kazimierczuk

Download or read book Average Current-Mode Control of DC-DC Power Converters written by Marian K. Kazimierczuk and published by John Wiley & Sons. This book was released on 2022-03-14 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: AVERAGE CURRENT-MODE CONTROL OF DC-DC POWER CONVERTERS An authoritative one-stop guide to the analysis, design, development, and control of a variety of power converter systems Average Current-Mode Control of DC-DC Power Converters provides comprehensive and up-to-date information about average current-mode control (ACMC) of pulse-width modulated (PWM) dc-dc converters. This invaluable one-stop resource covers both fundamental and state-of-the-art techniques in average current-mode control of power electronic converters???featuring novel small-signal models of non-isolated and isolated converter topologies with joint and disjoint switching elements and coverage of frequency and time domain analysis of controlled circuits. The authors employ a systematic theoretical framework supported by step-by-step derivations, design procedures for measuring transfer functions, challenging end-of-chapter problems, easy-to-follow diagrams and illustrations, numerous examples for different power supply specifications, and practical tips for developing power-stage small-signal models using circuit-averaging techniques. The text addresses all essential aspects of modeling, design, analysis, and simulation of average current-mode control of power converter topologies, such as buck, boost, buck-boost, and flyback converters in operating continuous-conduction mode (CCM). Bridging the gap between fundamental modeling methods and their application in a variety of switched-mode power supplies, this book: Discusses the development of small-signal models and transfer functions related to the inner current and outer voltage loops Analyzes inner current loops with average current-mode control and describes their dynamic characteristics Presents dynamic properties of the poles and zeros, time-domain responses of the control circuits, and comparison of relevant modeling techniques Contains a detailed chapter on the analysis and design of control circuits in time-domain and frequency-domain Provides techniques required to produce professional MATLAB plots and schematics for circuit simulations, including example MATLAB codes for the complete design of PWM buck, boost, buck-boost, and flyback DC-DC converters Includes appendices with design equations for steady-state operation in CCM for power converters, parameters of commonly used power MOSFETs and diodes, SPICE models of selected MOSFETs and diodes, simulation tools including introductions to SPICE, MATLAB, and SABER, and MATLAB codes for transfer functions and transient responses Average Current-Mode Control of DC-DC Power Converters is a must-have reference and guide for researchers, advanced graduate students, and instructors in the area of power electronics, and for practicing engineers and scientists specializing in advanced circuit modeling methods for various converters at different operating conditions.

Miniaturized, Low-voltage Power Converters with Fast Dynamic Response

Author : David Michael Giuliano
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (868 download)

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Book Synopsis Miniaturized, Low-voltage Power Converters with Fast Dynamic Response by : David Michael Giuliano

Download or read book Miniaturized, Low-voltage Power Converters with Fast Dynamic Response written by David Michael Giuliano and published by . This book was released on 2013 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis introduces a two-stage architecture that combines the strengths of switched capacitor (SC) techniques (small size, light-load performance) with the high efficiency and regulation capability of switch-mode power converters. The resulting designs have a superior efficient-power density trade-off over traditional designs. These power converters can provide numerous lowvoltage outputs over a wide input voltage range with a very fast dynamic response, which are ideal for powering logic devices in the mobile and high-performance computing markets. Both design and fabrication considerations for power converters using this architecture are addressed. The results are demonstrated in a 2.4 W dc-dc converter implemented in a 180 nm CMOS IC process and co-packaged with its passive components for high-performance. The converter operates from an input voltage of 2.7 V to 5.5 V with an output voltage of /= 1.2 V, and achieves a 2210 W/inch3 power density with /= 80% efficiency.

Advanced Multiphasing Switched-Capacitor DC-DC Converters

Author : Nicolas Butzen
Publisher : Springer Nature
ISBN 13 : 3030387356
Total Pages : 160 pages
Book Rating : 4.0/5 (33 download)

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Book Synopsis Advanced Multiphasing Switched-Capacitor DC-DC Converters by : Nicolas Butzen

Download or read book Advanced Multiphasing Switched-Capacitor DC-DC Converters written by Nicolas Butzen and published by Springer Nature. This book was released on 2020-07-03 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a detailed analysis of switched-capacitor DC-DC converters that are entirely integrated on a single chip and establishes that these converters are mainly limited by the large parasitic coupling, the low capacitor energy density, and the fact that switched-capacitor converter topologies only have a fixed voltage conversion ratio. The authors introduce the concept of Advanced Multiphasing as a way to circumvent these limitations by having multiple out-of-phase parallel converter cores interact with each other to minimize capacitor charging losses, leading to several techniques that demonstrate record efficiency and power-density, and even a fundamentally new type of switched-capacitor topology that has a continuously-scalable conversion ratio. Provides single-source reference to the recently-developed Advanced Multiphasing concept; Enables greatly improved performance and capabilities in fully integrated switched-capacitor converters; Enables readers to design DC-DC converters, where multiple converter cores are put in parallel and actively interact with each other over several phases to improve their capabilities.

Digitally Controlled DC-DC Converters with Fast and Smooth Load Transient Response

Author : Jing Wang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis Digitally Controlled DC-DC Converters with Fast and Smooth Load Transient Response by : Jing Wang

Download or read book Digitally Controlled DC-DC Converters with Fast and Smooth Load Transient Response written by Jing Wang and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

A 10 "CEBCs" Fast-transient Response and Low-power Digital DC-DC Converters for 98% High Efficiency at 300mA and 95% at 10mA.

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis A 10 "CEBCs" Fast-transient Response and Low-power Digital DC-DC Converters for 98% High Efficiency at 300mA and 95% at 10mA. by :

Download or read book A 10 "CEBCs" Fast-transient Response and Low-power Digital DC-DC Converters for 98% High Efficiency at 300mA and 95% at 10mA. written by and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Non-Isolated DC-DC Converters for Renewable Energy Applications

Author : Frede Blaabjerg
Publisher : CRC Press
ISBN 13 : 1000378861
Total Pages : 205 pages
Book Rating : 4.0/5 (3 download)

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Book Synopsis Non-Isolated DC-DC Converters for Renewable Energy Applications by : Frede Blaabjerg

Download or read book Non-Isolated DC-DC Converters for Renewable Energy Applications written by Frede Blaabjerg and published by CRC Press. This book was released on 2021-04-22 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photovoltaic (PV) energy generation is an excellent example of large-scale electric power generation through various parallel arrangements of small voltage-generating solar cells or modules. However, PV generation systems require power electronic converters system to satisfy the need for real-time applications or to balance the demand for power from electric. Therefore, a DC-DC power converter is a vital constituent in the intermediate conversion stage of PV power. This book presents a comprehensive review of various non-isolated DC-DC power converters. Non-isolated DC-DC converters for renewable energy system (RES) application presented in this book 1st edition through a detailed original investigation, obtained numerical/experimental results, and guided the scope to design new families of converters: DC-DC multistage power converter topologies, Multistage "X-Y converter family", Nx IMBC (Nx Interleaved Multilevel Boost Converter), Cockcroft Walton (CW) Voltage Multiplier-Based Multistage/Multilevel Power Converter (CW-VM-MPC) converter topologies, and Z-source and quasi Z-source. Above solutions are discussed to show how they can achieve the maximum voltage conversion gain ratio by adapting the passive/active component within the circuits. For assessment, we have recommended novel power converters through their functionality and designs, tested and verified by numerical software. Further, the hardware prototype implementation is carried out through a flexible digital processor. Both numerical and experimental results always shown as expected close agreement with primary theoretical hypotheses. This book offers guidelines and recommendation for future development with the DC-DC converters for RES applications based on cost-effective, and reliable solutions.

Design of a Low-voltage Low-power Dc-dc HF Converter

Author : Jingying Hu (Ph. D.)
Publisher :
ISBN 13 :
Total Pages : 234 pages
Book Rating : 4.:/5 (243 download)

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Book Synopsis Design of a Low-voltage Low-power Dc-dc HF Converter by : Jingying Hu (Ph. D.)

Download or read book Design of a Low-voltage Low-power Dc-dc HF Converter written by Jingying Hu (Ph. D.) and published by . This book was released on 2008 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many portable electronic applications could benefit from a power converter able to achieve high efficiency across wide input and output voltage ranges at a small size. However, it is difficult for many conventional power converter designs to provide wide operation range while maintaining high efficiency, especially if both up-and-down voltage conversion is to be achieved. Furthermore, the bulk energy storage required at contemporary switching frequencies of a few megahertz and below limits the degree of miniaturization that can be achieved and hampers fast transient response. Therefore, design methods that reduce energy storage requirements and expand efficient operation range are desirable. This thesis focuses on the development of a High Frequency (HF) dc-dc SEPIC converter exploiting resonant switching and gating with fixed frequency control techniques to achieve these goals. The proposed approach provides high efficiency over very wide input and output voltage ranges and power levels. It also provides up-and-down conversion, and requires little energy storage which allows for excellent transient response. The proposed design strategies are discussed in the context of a prototype converter operating over wide input voltage (3.6 - 7.2V), output voltage (3 - 9V) and power (0.3 - 3W) ranges. The 20MHz converter prototype, utilizing commercial vertical MOSFETs, takes advantage of a quasi-resonant SEPIC topology and resonant gating technique to provide good efficiency across the wide operating ranges required. The converter efficiency stays above 80% across the entire input voltage range at the nominal output voltage. The closed-loop performance is demonstrated via an implementation of a PWM on-off control scheme, illustrating the salient characteristics in terms of additional control circuitry power dissipation and transient response.

Dynamic Analysis of Switching-Mode DC/DC Converters

Author : Andre Kislovski
Publisher : Springer Science & Business Media
ISBN 13 : 9401178496
Total Pages : 409 pages
Book Rating : 4.4/5 (11 download)

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Book Synopsis Dynamic Analysis of Switching-Mode DC/DC Converters by : Andre Kislovski

Download or read book Dynamic Analysis of Switching-Mode DC/DC Converters written by Andre Kislovski and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most critical part of the modern switching-mode power supply is the regulated dc/dc converter. Its dynamic behavior directly determines or influences four of the important characteristics of the power supply: • Stability of the feedback loop • Rejection of input-voltage ripple and the closely-related transient re sponse to input-voltage perturbation • Output impedance and the closely-related transient response to load perturbation • Compatibility with the input EMI filter Due to the complexity of the operation of the converter, predicting its dynamic behavior has not been easy. Without accurate prediction, and depending only on building the circuit and tinkering with it until the operation is satisfactory, the engineering cost can easily escalate and schedules can be missed. The situation is not much better when the circuit is built in the computer, using a general-purpose circuit-simulation program such as SPICE. (At the end of this book is a form for obtaining information on a computer program especially well suited for dynamic analysis of switching-mode power converters: DYANA, an acronym for "DYnamic ANAlysis. " DYANA is based on the method given in this book. ) The main goal of this book is to help the power-supply designer in the prediction of the dynamic behavior by providing user-friendly analytical tools, concrete results of already-made analyses, tabulated for easy application by the reader, and examples of how to apply the tools provided in the book.

Design and Evaluation of a Very High Frequency Dc/dc Converter

Author : Robert C. N. Pilawa-Podgurski
Publisher :
ISBN 13 :
Total Pages : 143 pages
Book Rating : 4.:/5 (22 download)

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Book Synopsis Design and Evaluation of a Very High Frequency Dc/dc Converter by : Robert C. N. Pilawa-Podgurski

Download or read book Design and Evaluation of a Very High Frequency Dc/dc Converter written by Robert C. N. Pilawa-Podgurski and published by . This book was released on 2007 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a resonant boost topology suitable for very high frequency (VHF, 30-300 MHz) dc-dc power conversion. The proposed design is a fixed frequency, fixed duty ratio resonant converter featuring low device stress, high efficiency over a wide load range, and excellent transient performance. A 110 MHz, 23 W experimental converter has been built and evaluated. The input voltage range is 8-16 V (14.4 V nominal), and the selectable output voltage is between 22-34 V (33 V nominal). The converter achieves higher than 87% efficiency at nominal input and output voltages, and maintains efficiency above 80% for loads as small as 5% of full load. Furthermore, efficiency is high over the input and output voltage range. In addition, a resonant gate drive scheme suitable for VHF operation is presented, which provides rapid startup and low-loss operation. The converter regulates the output using high-bandwidth on-off hysteretic control, which enables fast transient response and efficient light load operation. The low energy storage requirements of the converter allow the use of coreless inductors, thereby eliminating magnetic core loss and introducing the possibility of integration. The target application of the converter is the automotive industry, but the design presented here can be used in a broad range of applications where size, cost, and weight are important, as well as high efficiency and fast transient response.

Miniatured, High-frequency DC-DC Power Conversion for Embedded Applications

Author : Sakshi Arora
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (857 download)

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Book Synopsis Miniatured, High-frequency DC-DC Power Conversion for Embedded Applications by : Sakshi Arora

Download or read book Miniatured, High-frequency DC-DC Power Conversion for Embedded Applications written by Sakshi Arora and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to achieve high power density in battery-powered systems, as well as accommodate the reduced breakdown voltages in scaled CMOS technologies, systems-on-a-chip (SoCs) typically employ one or more supply voltages generated using dc-dc converters. Dc-dc converters are commonly implemented as inductive switching converters because of their high efficiency. However, inductive converters typically have a large footprint that is dominated by the size of bulky off-chip inductors and capacitors. In order to reduce the size of an inductive converter, its switching frequency can be increased by orders of magnitude above the existing practice. However, the use of a high switching frequency leads to increased switching power losses that in turn decrease the power conversion efficiency. To address this challenge, techniques for designing a high-efficiency buck converter while using miniaturized external components are investigated in this research. Design techniques, such as using a high switching frequency that is tunable with the load current and the segmentation and cascoding of power transistors are employed to achieve high power efficiency across a wide range of load currents. While in SoC applications multiple voltages are typically derived from battery by connecting converters in parallel, this work introduces a cascaded, dual-output buck converter topology. Cascading buck converters reduces the input supply voltage of the second converter, thus reducing the switching and ripple-conduction losses that severely affect the efficiency of buck converters using small inductors and operating at high switching frequencies. The use of high-frequency, cascaded conversion presents two significant challenges to the design of the controller for a buck converter. First is the need for adjustability of the switching frequency with varying load currents, and second is the possibility of cross regulation between the outputs of the converter. A digital constant-off-time controller is proposed to address these challenges. The controller enables tuning of the converter's switching frequency. The controller has a fast transient response and good line regulation that help to suppress cross regulation between the two outputs of the buck converter. To demonstrate the proposed multiple-output, cascaded, high-frequency converter, an experimental prototype has been integrated in a 90-nm CMOS technology. This prototype provides two output voltages using a cascade of two buck converters, each employing a small output capacitor on the order of 100 picofarads and a small inductor on the order of nanohenries, thereby reducing the overall size of the converter compared to conventional alternatives.

Input Voltage Ripple Based Sensorless Current Sharing Auto-tuning Controller for Multiphase DC-DC Converters

Author : Wangxin Huang
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (131 download)

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Book Synopsis Input Voltage Ripple Based Sensorless Current Sharing Auto-tuning Controller for Multiphase DC-DC Converters by : Wangxin Huang

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.