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Enhanced Performance Integrated Resonant Switched Capacitor And Buck Dc Dc Converters For Application In Extreme Radiation And Magnetic Field Environments
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Book Synopsis Enhanced-performance Integrated Resonant Switched-Capacitor and Buck DC-DC Converters for Application in Extreme Radiation and Magnetic Field Environments by : Giacomo Ripamonti
Download or read book Enhanced-performance Integrated Resonant Switched-Capacitor and Buck DC-DC Converters for Application in Extreme Radiation and Magnetic Field Environments written by Giacomo Ripamonti and published by . This book was released on 2020 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: DC-DC converters ; resonant power conversion ; integrated circuits ; modeling ; radiation hardening.
Book Synopsis Integrated Hybrid Resonant DCDC Converters by : Peter Renz
Download or read book Integrated Hybrid Resonant DCDC Converters written by Peter Renz and published by Springer Nature. This book was released on 2020-12-29 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive, single-source on resonant switched-capacitor converters. It is written in the style of a handbook, with systematic guidelines, and includes implementation examples. The authors explore integrated hybrid resonant DCDC converters in order to achieve highly compact, energy efficient and cost-effective power management solutions in the growing fields of wearables and internet-of-things applications. They provide an introduction into hybrid converters as a new and promising converter class, which merges capacitive and inductive conversion concepts into one. Coverage ranges from fundamentals to implementation details, including topics such as power stage design, gate drive schemes, different control mechanisms for resonant operation and integrated passives. Introduces a new, multi-ratio resonant converter architecture, which enables lower switching frequencies and better passive component utilization; Discusses circuit block design for high efficiency of the power stage; Explores implementation details and concepts for integrated passives; Derives models, implements and compares to each other different control mechanisms.
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. This book was released on 2021-07-05 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.
Book Synopsis On-chip Buck-boost Switched-capacitor DC-DC Converter by : Chaohao Wang
Download or read book On-chip Buck-boost Switched-capacitor DC-DC Converter written by Chaohao Wang and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing integration level of CMOS integrated circuits (ICs) poses significant challenges for the power delivery network. Multiple independent power domains, each of them individually adjustable, are desirable for complex ICs to optimize the tradeoff between performance and energy consumption. A two-stage power management system, in which a first-stage global converter with a large down conversion ratio is followed by multiple second-stage local regulators for different power domains, fits well in modern power delivery networks. The first stage can be built with conventional, fully optimized DC-DC converters, while the second stage requires flexible, high-density, and high-efficiency on-chip DC-DC converters. With the enhanced fabrication capability of high-density on-chip capacitors, the switched-capacitor (SC) DC-DC converter becomes a perfect candidate for these second-stage on-chip regulators. This dissertation presents the architecture, modeling and design techniques for the development of fully integrated on-chip SC DC-DC converters for the purpose of local regulation. The proposed converter can step up or down the voltage based on the output requirement and circuit performance. Using the unit cell array approach, conversion ratios of n/(n+1) with buck configurations and (n+1)/n with boost configurations are achievable when n cells are grouped as a single converter. Thus, adequate topologies exist to provide a large range of output voltage with high efficiency. A prototype chip with 204 unit cells and nine different finely spaced buck and boost topologies was designed and fabricated in a 45nm bulk CMOS technology. The input is 1V, and the output ranges from 0.58V to 1.3V. The SC converter achieves a peak efficiency of 82.2% at a maximum power density of 0.16W/mm2. Furthermore, the efficiency varies by only 4.2% over the output voltage range. A digital algorithm for closed loop control was implemented in a field-programmable gate array (FPGA) to demonstrate that performance regulation using this type of converter can match circuit performance requirements and compensate for operating conditions or process variations. This dissertation also projects the potential improvements in SC converters with more advanced technology nodes as well as capacitor density scaling, such as using special on-chip capacitor processes like Metal-Insulator-Metal (MIM) capacitors and deep trench capacitors.
Book Synopsis Modeling, Optimization, and Comparison of Hybrid Resonant Switched Capacitor DC-DC Converters by : Muhammad Hassan Kiani
Download or read book Modeling, Optimization, and Comparison of Hybrid Resonant Switched Capacitor DC-DC Converters written by Muhammad Hassan Kiani and published by . This book was released on 2018 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent decades have seen rapid growth in portable-embedded computing and communications, which in turn has accelerated the need for high performance power management and delivery. This translates to a demand for high power density, low cost, small size, and high efficiency DC-DC converters. Traditionally, magnetics-based designs (like buck or boost) have dominated the DC-DC conversion realm. However, these architectures have a tradeoff between size of passives and efficiency. Hybrid-resonant switched capacitor (ReSC) DC-DC converters have shown great potential for applications that require both high density and efficiency. These approaches are known to benefit from the favorable active-device-utilization properties of switched capacitor (SC) converters and the relatively high energy density of capacitors compared to inductors, while mitigating the charge-sharing losses inherent in SC designs. Compared to buck or boost DC-DC converters the hybrid approach promises to reduce the size of magnetic components by reducing the volt-second or flux linkage requirements. While hybrid-resonant SC converters have shown a lot of promise, it has thus far been difficult to assess which topologies are most favorable given constraints on size (area or volume), energy storage, or power loss. This work presents a comprehensive study to model the losses in hybrid-resonant switched capacitor (ReSC) DC-DC converters. Both the losses in the active semiconductor devices and magnetic components are considered. The formulation presented in this work allows comparison between different converter architectures across conversion ratios given some common constraints. Optimization techniques are presented to minimize the losses in the individual components and the overall converter. Finally, given the drive for miniaturization of passive components, a technique is developed that leads to optimal allocation of size between flying capacitors and inductor(s) with a constraint on total size of passives.
Book Synopsis Reconfigurable Switched-Capacitor Power Converters by : Dongsheng Ma
Download or read book Reconfigurable Switched-Capacitor Power Converters written by Dongsheng Ma and published by Springer Science & Business Media. This book was released on 2012-07-25 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers specializing in ultra-low power supply design for self-powered applications an invaluable reference on reconfigurable switched capacitor power converters. Readers will benefit from a comprehensive introduction to the design of robust power supplies for energy harvesting and self-power applications, focusing on the use of reconfigurable switched capacitor based DC-DC converters, which is ideal for such applications. Coverage includes all aspects of switched capacitor power supply designs, from fundamentals, to reconfigurable power stages, and sophisticated controller designs.
Book Synopsis Analytical and Practical Analysis of Switched-capacitor DC-DC Converters by : Michael Douglas Seeman
Download or read book Analytical and Practical Analysis of Switched-capacitor DC-DC Converters written by Michael Douglas Seeman and published by . This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Zero Current Switching Switched-capacitor Dc-dc Converters for Thermoelectric Generation Applications by : Dong Cao (University and college faculty member)
Download or read book Zero Current Switching Switched-capacitor Dc-dc Converters for Thermoelectric Generation Applications written by Dong Cao (University and college faculty member) and published by . This book was released on 2009 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Switched Capacitor DC-DC Converter by : Vincent Wai-Shan Ng
Download or read book Switched Capacitor DC-DC Converter written by Vincent Wai-Shan Ng and published by . This book was released on 2011 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The traditional inductor-based buck converter has been the default design for switched-mode voltage regulators for decades. Switched capacitor (SC) dc-dc converters, on the other hand, have traditionally been used in low power (10mW) and low conversion ratio (
Book Synopsis Switched Capacitor-Based DC-DC Converter with Ultra-High Efficiency, Power Density and Voltage Regulation Capability by : Deepak Gunasekaran
Download or read book Switched Capacitor-Based DC-DC Converter with Ultra-High Efficiency, Power Density and Voltage Regulation Capability written by Deepak Gunasekaran and published by . This book was released on 2018 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Control of High-density DC-DC Coverters for Cell Balancing and Low-voltage Power Delivery Application by : Christopher Schaef
Download or read book Design and Control of High-density DC-DC Coverters for Cell Balancing and Low-voltage Power Delivery Application written by Christopher Schaef and published by . This book was released on 2016 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a variety of applications spanning mobile devices, performance computing, and even renewable energy and automotive, power management and power delivery are an increasing bottleneck in reducing size and cost, improving reliability, and even increasing performance. For example, conventional DC-DC converters rely on magnetic components (inductors and transformers) to efficiently process and transfer energy among different voltage levels. However, while active semiconductor devices have benefited from exponential scaling for many decades (i.e. Moore’s Law), many modern dc-dc converters, particularly highly integrated and high-frequency designs, struggle with the size of magnetic components and the lack of efficient magnetic materials at high switching frequencies. Switched-capacitor dc-dc converters hold the promise to completely eliminate magnetic components in dc-dc converters and can even outperform conventional magneticbased topologies over a wide range of power and voltage levels. Despite the many attractive features of switched-capacitor converters, especially for on-chip power conversion, SC converters are limited by charge sharing losses are therefore not able to access a large portion of the energy density of the capacitors. An argument can be made that the high efficiency and power-density of the best designs has resulted from expensive and not readily available high-density capacitors (i.e. Deep Trench), and high-end deep-submicron semiconductor processes (e.g. SOI) with low parasitic capacitance. A further challenge is the ability to regulate the output voltage. Commonly used linear regulation modes can limit power density or severely hurt efficiency if used over a wide range of output voltage. This thesis explores resonant-switched capacitor converters (ReSC) which leverage a small magnetic component to improve efficiency and power density of switched capacitor converters. Compared to conventional magnetic converters, ReSC converters can operate with high efficiency even with very small values of inductance by leveraging resonance with the flying capacitors. Here an integrated circuit prototype demonstrates operation with 1.1 nH inductors delivering 7.7Wwith 85%efficiency. Importantly, the addition of a small magnetic component offers paths towards new control strategies and modes of operation, which are explored in a 12 V to 3.7 V ReSC IC that demonstrated closed loop regulation. A discrete flying capacitor multilevel converter is then presented which demonstrates all possible operating modes including resonant, quasi-resonant and inductive in combination with continuous and discontinuous conduction. Additional control work revolves around highly granular power management based on partial power processing ladder converters. Discrete prototypes that showcase new control strategies for photovoltaic power generation and microprocessor power delivery are presented.
Book Synopsis Highly-integrated switched-capacitor DC-DC converters by :
Download or read book Highly-integrated switched-capacitor DC-DC converters written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrated High-voltage Switched-capacitor DC-DC Converters by : Daniel Lutz
Download or read book Integrated High-voltage Switched-capacitor DC-DC Converters written by Daniel Lutz and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Switched-capacitor DC/DC Converter with Resonant Gate Drive by : Brede Arntzen
Download or read book Switched-capacitor DC/DC Converter with Resonant Gate Drive written by Brede Arntzen and published by . This book was released on 1996 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Switched-capacitor DC-DC Converters for Near-threshold Design by : Moataz Abdelfattah
Download or read book Switched-capacitor DC-DC Converters for Near-threshold Design written by Moataz Abdelfattah and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With the increasing power and thermal limits in the computing industry, energy-efficient computing has become an urging necessity. Therefore, a surge of interest has been recently given to the concept of Near-Threshold Computing (NTC) as a potential candidate to realize energy-efficiency in computations. By operating at supply voltages near the transistor’s threshold voltage, NTC promises significant energy savings with moderate performance loss, which can be compensated for through parallelism. However, NTC faces a few challenges that hinder its wide adoption. On top of these challenges are the harsh specifications required for the power management and delivery units. Specifically, a power converter in an NTC system is required to achieve high efficiency at high current densities and low output voltages while seamlessly integrated on-chip, which are all contradicting specifications. To tackle the problem of energy-efficient computing, this research work addresses the challenges of NTC, with focus on power delivery. To do so, first, the target application of NTC is investigated to acquire the basic understanding of its challenges, opening doors for innovations and solutions for these challenges. Based on this understanding, which reveals the importance of power delivery for NTC and defines the requirements on power converters, most of the work in this thesis will focus on Switched-Capacitor (SC) power converters, which are found to be the most suitable type of converters for NTC. Therefore, a detailed study and literature review of SC converters is carried out. This study provides an in-depth understanding of SC converters operation, mechanisms, and challenges. Specifically, it is demonstrated that the most advantageous characteristic of SC converters is their compatibility with CMOS integration, while the most challenging aspect is their limited current density. Consequently, this thesis sets forth to address this challenge and proposes two solutions to boost the current density of SC converters, and thus, offering feasible power converter architectures for NTC. The first solution proposed in this thesis focuses on the control loop of SC converters. Unlike regular control loops, which often utilize frequency, capacitance, or conductance modulation, the proposed technique combines all three control knobs. The combination of these parameters allows for ripple reduction without sacrificing current density, and thus, effectively increases the converter’s density. Furthermore, this combination of parameters maintains the efficiency near its peak across a wide range of load currents, which is another relevant feature for NTC. The second solution introduces the concept of resonant gate drivers to SC converters, increasing the converter efficiency with no impact on current density. This solution is implemented in 45 nm SOI technology and fabricated for validation. The measurement results demonstrate a 70% efficiency at 1 A/mm2 current density and 0.4 V output voltage, which is a new efficiency/current-density record in the near-threshold range. In summary, as a potential solution to the problem of energy-efficiency in computations, NTC and its challenges are investigated. To address its most critical challenge of power delivery, SC converters are studied and circuit techniques are proposed to boost their current density and offer a feasible power delivery for NTC applications.
Book Synopsis Design of Area- and Power-efficient Dual-output Switched-capacitor DC-DC Converters by : Zhe Hua
Download or read book Design of Area- and Power-efficient Dual-output Switched-capacitor DC-DC Converters written by Zhe Hua and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Power management integrated circuits have found wide applications in all battery-powered electronic systems like smartphones, wireless sensors, etc., to convert a time-varying unregulated battery voltage to constant regulated DC output voltages for different internal functional blocks of the system. With the increase in the complexity of today’s electronic systems, a multiple-output power management system is desired to optimize the power consumption of each loading block such that the power dissipation of the whole system can be minimized to extend the battery run-time. Driven by the demands for high power efficiency and high area efficiency in generating multiple outputs for energy-harvesting and portable applications, the multiple-output switched-capacitor (SC) DC-DC converter is becoming a popular candidate as it does not require any costly and bulky inductor for energy storage, thereby minimizing the overall converter volume and EMI noise. Moreover, flying capacitors as energy-storage components and power transistors as energy-transfer paths in the multiple-output SC DC-DC converters can be shared by different outputs such that the number of required flying capacitors and power transistors can be minimized to optimize both area efficiency and energy density. In the first part of this research, a reconfigurable step-up dual-output SC DC-DC regulator is introduced, analyzed and verified for low power energy-harvesting applications. A sub-harmonic adaptive-on-time (SHAOT) control scheme is proposed to improve the light-load power efficiency under different load currents, maintain low output ripples under different input voltages, provide predictable output noise spectrum, and minimize output cross regulation between both outputs in the SC DC-DC regulator. In the second part of this research, a battery-connected reconfigurable step-down dual-output SC DC-DC regulator is developed to deliver a maximum load of 1.2A for portable applications. With flying-capacitor sharing and an all-nMOS power stage, the proposed dual-output SC power stage is efficient in both chip and board areas. A switch-resistance-modulation (SRM) control scheme is also proposed to provide small output voltage ripples with a small load capacitance under 100s-of-mA load and to minimize output cross regulation between two outputs under large load-step variations.
Book Synopsis Switched-Capacitor DC-DC Converters by : Gabor Temes
Download or read book Switched-Capacitor DC-DC Converters written by Gabor Temes and published by . This book was released on 2006-09-30 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inductorless dc-dc converters are used to provide the proper operating bias conditions for a range of circuits, including important applications: programming circuits for EEPROM non-volatile memory chips, low-voltage micro-power circuits, and circuits regulating the voltage provided by batteries needed in portable devices such as cellular phones.
