Download or read book Digital Aided Synchronization and Mixed Signal Modeling of High Frequency Dc dc Converters written by Deepak Bhatia and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In addition, a behavioral model which describes the dc-dc converter as a voltage controlled oscillator is proposed and the analysis of the entire design as a Charge Pump PLL (CPPLL) is presented. The DPLL synchronized converter works over a frequency range of 90-240MHz and was implemented in a 130nm digital CMOS process. A simulation approach for mixed signal designs is described. This methodology helps in reducing interface problems for large designs and also decreases simulation time. In addition, aspects of digital synthesis flow are described. A mixed signal simulation of a DPLL synchronized buck converter is presented as an example to show how SpectreVerilog can be used to validate the analog-digital interface and verify proper functionality of the design.

Download or read book Synchronization and Control of High Frequency Dc dc Converters written by Pengfei Li and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, this thesis reports a digital delay locked loop to synchronize a high frequency multiphase boost converter. The boost converter employs current mode pulse-width-modulation, and the D-DLL provides multiphase synchronization signals with accurate duty cycle control. The proposed digital control scheme can easily accommodate high frequency dc-dc converters with different structures and control loops, enabling fast and flexible design strategies for power management systems.

Download or read book Synchronous and Resonant DC DC Conversion Technology Energy Factor and Mathematical Modeling written by Fang Lin Luo and published by CRC Press. This book was released on 2018-10-03 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numbers alone are enough to describe the importance of DC/DC converters in modern power engineering. There are more than 500 recognized topologies, with more added each year. In their groundbreaking book Advanced DC/DC Converters, expert researchers Luo and Ye organized these technologies into six generations and illustrated their principles and operation through examples of over 100 original topologies. In chapters carefully drawn from that work, Synchronous and Resonant DC/DC Conversion Technology, Energy Factor, and Mathematical Modeling provides a focused, concise overview of synchronous and multiple-element resonant power converters. This reference carefully examines the topologies of more than 50 synchronous and resonant converters by illustrating the design of several prototypes developed by the authors. Using more than 100 diagrams as illustration, the book supplies insight into the fundamental concepts, design, and applications of the fifth (synchronous) and sixth (multiple-element resonant) converters as well as DC power sources and control circuits. The authors also discuss EMI/EMC problems and include a new chapter that introduces the new concept of Energy Factor (EF) and its importance in mathematical modeling as well as analyzing the transient process and impulse response of DC/DC converters. Synchronous and Resonant DC/DC Conversion Technology, Energy Factor, and Mathematical Modeling supplies a quick and accessible guide for anyone in need of specialized information on synchronous and resonant DC/DC converter technologies.

Download or read book Modeling and Digital Control of High Frequency DC DC Power Converters written by Yangyang Wen and published by . This book was released on 2007 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: In chapter 5, another nonlinear compensation algorithm is proposed for asymmetric flybackforward half bridge dc-dc converter to reduce the system loop gain's dependence on the input voltage, and improve the system's dynamic response at high input line. In chapter 6, a unified pulse width modulation (PWM) scheme is proposed to extend the duty-cycle-shift (DCS) control, where PWM pattern is adaptively generated according to the input voltage level, such that the power converter's voltage stress are reduced and efficiency is improved. With the great flexibility of digital PWM modulation offered by the digital controller Si8250, the proposed control scheme is implemented and verified. Conclusion of the dissertation work and suggestions for future work in related directions are given in final chapter.

Download or read book Integrated High Vin Multi MHz Converters written by Jürgen Wittmann and published by Springer Nature. This book was released on 2019-09-03 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with guidelines for designing integrated multi-MHz-switching converters for input voltages/system supplies up to 50V or higher. Coverage includes converter theory, converter architectures, circuit design, efficiency, sizing of passives, technology aspects, etc. The author discusses new circuit designs, new architectures and new switching concepts, including dead-time control and soft-switching techniques that overcome current limitations of these converters. The discussion includes technology related issues and helps readers to choose the right technology for fast-switching converters. This book discusses benefits and drawbacks in terms of integration, size and cost, efficiency and complexity, and enables readers to make trade-offs in design, given different converter parameters. Describes a study for increasing switching frequencies up to 30 MHz at input voltages up to 50V or higher in the scaling of the size of switching converter passives; Analyzes various buck converter implementations and shows that a preference due to higher efficiency depends on the operating point, on the available switch technologies, and on the implementation of the high-side supply generation; Describes an efficiency model based on a four-phase model, which enables separation of loss causes and loss locations.

Download or read book Multi MHz High Frequency Resonant DC DC Power Converter written by Dianguo Xu and published by Springer Nature. This book was released on 2020-08-08 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book analyzes multi-MHz high frequency resonant DC-DC power converters with operating frequencies ranging from several MHz to tens of MHz in detail, aiming to support researchers and engineers with a focus on multi-MHz high frequency converters. The inverter stage, rectifier stage, matching network stage are analyzed in detail. Based on the three basic stages, typical non-isolated and isolated resonant DC-DC converters are depicted. To reduce the high driving loss under multi-MHz, resonant driving methods are introduced and improved. Also, the design and selection methods of passive and active component under multi-MHz frequency are described, especially for aircore inductor and transformer. Furthermore, multi-MHz resonant converter provides an approach for achieving flexible system.

Download or read book Design and Implementation of Fully Integrated Inductive DC DC Converters in Standard CMOS written by Mike Wens and published by Springer Science & Business Media. This book was released on 2011-05-10 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: CMOS DC-DC Converters aims to provide a comprehensive dissertation on the matter of monolithic inductive Direct-Current to Direct-Current (DC-DC) converters. For this purpose seven chapters are defined which will allow the designer to gain specific knowledge on the design and implementation of monolithic inductive DC-DC converters, starting from the very basics.

Download or read book Modeling Control and Digital Implementation of DC DC Converters Under Variable Switching Frequency Operation written by Robert Priewasser and published by . This book was released on 2013 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Three Dimensional Integrated Circuit Design written by Vasilis F. Pavlidis and published by Newnes. This book was released on 2017-07-04 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-Dimensional Integrated Circuit Design, Second Eition, expands the original with more than twice as much new content, adding the latest developments in circuit models, temperature considerations, power management, memory issues, and heterogeneous integration. 3-D IC experts Pavlidis, Savidis, and Friedman cover the full product development cycle throughout the book, emphasizing not only physical design, but also algorithms and system-level considerations to increase speed while conserving energy. A handy, comprehensive reference or a practical design guide, this book provides effective solutions to specific challenging problems concerning the design of three-dimensional integrated circuits. Expanded with new chapters and updates throughout based on the latest research in 3-D integration: Manufacturing techniques for 3-D ICs with TSVs Electrical modeling and closed-form expressions of through silicon vias Substrate noise coupling in heterogeneous 3-D ICs Design of 3-D ICs with inductive links Synchronization in 3-D ICs Variation effects on 3-D ICs Correlation of WID variations for intra-tier buffers and wires Offers practical guidance on designing 3-D heterogeneous systems Provides power delivery of 3-D ICs Demonstrates the use of 3-D ICs within heterogeneous systems that include a variety of materials, devices, processors, GPU-CPU integration, and more Provides experimental case studies in power delivery, synchronization, and thermal characterization

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.

Download or read book A Contribution to Synchronization of the Sliding mode Control based Integrated Step down DC DC Converter written by Benoit Labbe and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile applications necessitate nowadays huge digital-resources. Power management of a digital System-On-Chip (SOC) is based on dynamic voltage scaling. DC/DC converters used to supply the digital SoCs are facing stringent constraints with respect to load-transients, line-transients and reference tracking. Hysteretic control is known as the most convenient control scheme with a fair trade-off between transient performances, analog implementation and power consumption, particularly for one-phase architecture. The thesis focuses on-board DC/DC with a significant constraint on footprint (i.e. on components count and values). Fixed switching-frequency hysteretic control has been experimented with significant results. Transient performances are reduced due to latency introduced in the switching frequency control. The present study focuses on the improvement of the concept as well as its implementation and the analysis of stability. A new analog implementation of the sliding-mode control is presented with switching-frequency control using a particular analog phase-locked-loop but preserve transient performances. The DC/DC converter is implemented in CMOS 130nm by STMicroelectronics. The switching frequency range has been voluntarily limited and excludes the possible integration of passive components for the sake of silicon access. A hybrid demonstrator is presented with efficiency higher than 80 % between 2.4 mW and 960 mW output power.

Download or read book Design and Implementation of High Frequency 3D DC DC Converter written by Florian Neveu and published by . This book was released on 2020 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultimate integration of power switch-mode converter relies on two research paths. One path experiments the development of switched-capacitor converters. This approach fits silicon integration but is still limited in term of power density. Inductive DC-DC architectures of converters suffer by the values and size of passive components. This limitation is addressed with an increase in frequency. Increase in switching losses in switches leads to consider advanced technological nodes. Consequently, the capability with respect to input voltage is then limited. Handling 3.3 V input voltage to deliver an output voltage in the range 0.6 V to 1.2 V appears a challenging specification for an inductive buck converter if the smallest footprint is targeted at +90 % efficiency. Smallest footprint is approached through a 3D assembly of passive components to the active silicon die. High switching frequency is also considered to shrink the values of passive components as much as possible. In the context of on-chip power supply, the silicon technology is dictated by the digital functions. Complementary Metal-Oxide- Semiconductor (CMOS) bulk C40 is selected as a study case for 3.3 V input voltage. 3.3 V Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) features poor figure of merits and 1.2 V standard core, regular devices are preferred. Moreover future integration as an on-chip power supply is more compatible. A three-MOSFET cascode arrangement is experimented and confronted experimentally to a standard buck arrangement in the same technology. The coupled-phase architecture enables to reduce the switching frequency to half the operating frequency of the passive devices. +100MHz is selected for operation of passive devices. CMOS bulk C40 offers Metal-Oxide-Metal (MOM) and MOS capacitors, in density too low to address the decoupling requirements. Capacitors have to be added externally to the silicon die but in a tight combination. Trench-cap technology is selected and capacitors are fabricated on a separate die that will act as an interposer to receive the silicon die as well as the inductors. The work delivers an object containing a one-phase buck converter with the silicon die flip-chipped on a capacitor interposer where a tiny inductor die is reported. The one-phase demonstrator is suitable for coupled-phase demonstration. Standard and cascode configurations are experimentally compared at 100 MHz and 200 MHz switching frequency. A design methodology is presented to cover a system-to-device approach. The active silicon die is the central design part as the capacitive interposer is fabricated by IPDiA and inductors are provided by Tyndall National Institute. The assembly of the converter sub-parts is achieved using an industrial process. The work details a large set of measurements to show the performances of the delivered DC/DC converters as well as its limitations. A 91.5% peak efficiency at 100MHz switching frequency has been demonstrated.

Download or read book Power Efficiency Conscious Design and Implementation of High Frequency Integrated Synchronous Buck DC DC Converters for Portable Electronics Applications written by Xiaopeng Wang and published by . This book was released on 2010 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some Considerations on Circuit Modeling Layout and Instrumentation of Experimental High power High frequency DC DC Converters written by Rhett Trusdale George and published by . This book was released on 1981 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis Modeling and Control of Highly efficient Hybrid Dc dc Conversion Systems written by Ruichen Zhao and published by . This book was released on 2012 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation studies hybrid dc-dc power conversion systems based on multiple-input converters (MICs), or more generally, multiport converters. MICs allow for the integration of multiple distributed generation sources and loads. Thanks to the modular design, an MIC yields a scalable system with independent control in all sources. Additional characteristics of MICs include the improved reliability and reduced cost. This dissertation mainly studies three issues of MICs: efficiency improvement, modeling, and control. First, this work develops a cost-effective design of a highly-efficient non-isolated MIC without additional components. Time-multiplexing (TM) MICs, which are driven by a time-multiplexing switching control scheme, contain forward-conducting-bidirectional-blocking (FCBB) switches. TM-MICs are considered to be subject to low efficiency because of high power loss introduced by FCBB switches. In order to reduce the power loss in FCBB switches, this work adopts a modified realization of the FCBB switch and proposes a novel switching control strategy. The design and experimental verifications are motivated through a multiple-input (MI) SEPIC converter. Through the design modifications, the switching transients are improved (comparing to the switching transients in a conventional MI-SEPIC) and the power loss is significantly reduced. Moreover, this design maintains a low parts-count because of the absence of additional components. Experimental results show that for output power ranging from 1 W to 220 W, the modified MIC presents high efficiency (96 % optimally). The design can be readily extended to a general n-input SEPIC. The same modifications can be applied to an MI-Ćuk converter. Second, this dissertation examines the modeling of TM-MICs. In the dynamic equations of a TM-MIC, a state variable from one input leg is possible to be affected by state variables and switching functions associated with other input legs. In this way, inputs are coupled both topologically and in terms of control actions through switching functions. Coupling among the state variable and the time-multiplexing switching functions complicate TM-MICs' behavior. Consequently, substantial modeling errors may occur when a classical averaging approach is used to model an MIC even with moderately high switching frequencies or small ripples. The errors may increase with incremental number of input legs. In addition to demonstrating the special features on MIC modeling, this dissertation uses the generalized averaging approach to generate a more accurate model, which is also used to derive a small-signal model. The proposed model is an important tool that yields better results when analyzing power budgeting, performing large-signal simulations, and designing controllers for TM-MICs via a more precise representation than classical averaging methods. Analyses are supported by simulations and experimental results. Third, this dissertation studies application of a decentralized controller on an MI-SEPIC. For an MIC, a multiple-input-multiple-output (MIMO) state-space representation can be derived by an averaging method. Based on the averaged MIMO model, an MIMO small-signal model can be generated. Both conventional method and modern multivariable frequency analysis are applied to the small-signal model of an MI-SEPIC to evaluate open-loop and closed-loop characteristics. In addition to verifying the nominal stability and nominal performance, this work evaluates robust stability and robust performance with the structured singular value. The robust performance test shows that a compromised performance may be expected under the decentralized control. Simulations and experimental results verify the theoretical analysis on stability and demonstrate that the decentralized PI controller could be effective to regulate the output of an MIC under uncertainties. Finally, this work studies the control of the MIMO dc-dc converter serving as an active distribution node in an intelligent dc distribution grid. The unified model of a MIMO converter is derived, enabling a systematical analysis and control design that allows this converter to control power flow in all its ports and to act as a power buffer that compensates for mismatches between power generation and consumption. Based on the derived high-order multivariable model, a robust controller is designed with disturbance-attenuation and pole-placement constraints via the linear matrix inequality (LMI) synthesis. The closed-loop robust stability and robust performance are tested through the structured singular value synthesis. Again, the desirable stability and performance are verified by simulations and experimental results.

Download or read book Phase Shift DC DC Converters Digital Control Control Hardware in the Loop and Hardware Real Time Simulation Study written by Mohsen Mirtalebi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Sample Data Modeling for Double Edge Current Programmed Mode Control in High Frequency and Wide Range DC DC Converters written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on sample-data modeling for double edge current programmed mode control (DECPM) and its application to high frequency and wide range DC-DC converters. Steady state conditions and subharmonic oscillation issues for DECPM are addressed. By combining the conventional peak and valley current programmed mode control, a sample-data model for DECPM is proposed. A small signal model for DECPM is developed by deriving the modulation gains (Fm) and the sampling gains (He) for DECPM from the proposed sample-data model. The sampling frequency dependence on the duty ratio and a large current loop gain at high frequency for DECPM are emphasized. The analytical results are verified by the simulation. Finally, DECPM is proposed as a method to control the high frequency and wide range DC-DC converters. A 10MHz four switch buck boost converter is implemented with DECPM to verify the viability of its application to high frequency and wide range converters.