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Soft Switching For Improving The Efficiency And Power Density Of A Single Phase Converter With Power Factor Correction
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Book Synopsis Soft Switching for Improving the Efficiency and Power Density of a Single-phase Converter with Power Factor Correction by : Tine Konjedic
Download or read book Soft Switching for Improving the Efficiency and Power Density of a Single-phase Converter with Power Factor Correction written by Tine Konjedic and published by . This book was released on 2015 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the possibilities for increasing the power conversion efficiency and power density of a single-phase single-stage AC-DC converter with power factor correction capability. Initially, the limitations are investigated for simultaneous increase of power density and efficiency in hard switched bidirectional converters. The switching frequency dependent turn-on losses of the transistors have been identified as the main limiting factor. In order to avoid the increase in total power losses with increasing the switching frequency, a control approach is proposed for achieving zero voltage switching transitions within the entire operating range of a bidirectional converter that utilizes power transistors in a bridge structure. This approach is based on operation in the discontinuous conduction mode with a variable switching frequency. Operation in the discontinuous conduction mode ensures the necessary reversed current that naturally discharges the parasitic output capacitance of the transistor and thus allows this transistor to be turned on at zero voltage. On the other hand, the varying switching frequency ensures that the converter operates close to the zero voltage switching boundary, which is defined as the minimum required current ripple at which zero voltage switching can be maintained. Operation with the minimum required current ripple is desirable as it generates the lowest magnetic core losses and conduction losses within the power circuit. The performance and effectiveness of the investigated approach were initially verified in a bidirectional DC-DC converter. A reliable zero voltage switching was confirmed over the entire operating range of a bidirectional DC-DC converter, as well as the absence of the reverse recovery effect and the unwanted turn-on of the synchronous transistor. In order to justify its usage and demonstrate its superior performance, the proposed zero voltage switching technique was compared with a conventional continuous conduction mode operation which is characterized by hard switching commutations. After successful verification and implementation in a bidirectional DC-DC converter, the investigated zero voltage switching approach was adapted for usage in an interleaved DC-AC converter with power factor correction capability. Comprehensive analysis of the converter's operation in discontinuous conduction mode with a variable switching frequency was performed in order to derive its power loss model. The latter facilitated the design process of the converter's power circuit. A systematic approach for selecting the converter's power components has been used while targeting for an extremely high power conversion efficiency over a wide operating range and a low volume design of the converter. The final result of the investigations performed within the scope of this thesis is the interleaved AC-DC converter with power factor correction capability. Utilization of interleaving allows for increasing the converter's power processing capability, reduces the conducted differential mode noise and shrinks the range within which the switching frequency has to vary. The proposed zero voltage switching control approach was entirely implemented within a digital signal controller and does not require any additional components within the converter's circuit. The experimental results have confirmed highly efficient operation over a wide range of operating powers. A peak efficiency of 98.4 % has been achieved at the output power of 1100 W, while the efficiency is maintained above 97 % over the entire range of output powers between 200 W and 3050 W.
Book Synopsis Soft-Switching Technology for Three-phase Power Electronics Converters by : Dehong Xu
Download or read book Soft-Switching Technology for Three-phase Power Electronics Converters written by Dehong Xu and published by John Wiley & Sons. This book was released on 2021-12-29 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soft-Switching Technology for Three-phase Power Electronics Converters Discover foundational and advanced topics in soft-switching technology, including ZVS three-phase conversion In Soft-Switching Technology for Three-phase Power Electronics Converters, an expert team of researchers delivers a comprehensive exploration of soft-switching three-phase converters for applications including renewable energy and distribution power systems, AC power sources, UPS, motor drives, battery chargers, and more. The authors begin with an introduction to the fundamentals of the technology, providing the basic knowledge necessary for readers to understand the following articles. The book goes on to discuss three-phase rectifiers and three-phase grid inverters. It offers prototypes and experiments of each type of technology. Finally, the authors describe the impact of silicon carbide devices on soft-switching three-phase converters, studying the improvement in efficiency and power density created via the introduction of silicon carbide devices. Throughout, the authors put a special focus on a family of zero-voltage switching (ZVS) three-phase converters and related pulse width modulation (PWM) schemes. The book also includes: A thorough introduction to soft-switching techniques, including the classification of soft-switching for three phase converter topologies, soft-switching types and a generic soft-switching pulse-width-modulation known as Edge-Aligned PWM A comprehensive exploration of classical soft-switching three-phase converters, including the switching of power semiconductor devices and DC and AC side resonance Practical discussions of ZVS space vector modulation for three-phase converters, including the three-phase converter commutation process In-depth examinations of three-phase rectifiers with compound active clamping circuits Perfect for researchers, scientists, professional engineers, and undergraduate and graduate students studying or working in power electronics, Soft-Switching Technology for Three-phase Power Electronics Converters is also a must-read resource for research and development engineers involved with the design and development of power electronics.
Book Synopsis Design and Control of Power Converters 2020 by : Manuel Arias
Download or read book Design and Control of Power Converters 2020 written by Manuel Arias and published by MDPI. This book was released on 2021-06-04 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, nine papers focusing on different fields of power electronics are gathered, all of which are in line with the present trends in research and industry. Given the generality of the Special Issue, the covered topics range from electrothermal models and losses models in semiconductors and magnetics to converters used in high-power applications. In this last case, the papers address specific problems such as the distortion due to zero-current detection or fault investigation using the fast Fourier transform, all being focused on analyzing the topologies of high-power high-density applications, such as the dual active bridge or the H-bridge multilevel inverter. All the papers provide enough insight in the analyzed issues to be used as the starting point of any research. Experimental or simulation results are presented to validate and help with the understanding of the proposed ideas. To summarize, this book will help the reader to solve specific problems in industrial equipment or to increase their knowledge in specific fields.
Book Synopsis Design Techniques for Volume-efficient Soft-switched Power Converters with Enhanced Power Efficiency and Reliability by : Lin Cong
Download or read book Design Techniques for Volume-efficient Soft-switched Power Converters with Enhanced Power Efficiency and Reliability written by Lin Cong and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Zero voltage switching technique has been popular in high voltage DC-DC converter design to increase the switching frequency while maintaining high power efficiency and thus reducing the volume of passive components. Recently, enhancement-mode GaN FETs attracts more and more attention in high voltage converters for better figure of merits in RDSON and QG compared with the traditional MOSFETs. Although GaN FETs have been used in soft-switched DC-DC converters to further improve the power efficiency and power density, GaN FETs can cause more power loss in the third quadrant conduction than traditional MOSFETs if the dead time is not precisely controlled. In addition, fast transition of GaN FETs requires the high-voltage level shifter handle much faster dv/dt without creating logic errors. This dissertation develops a novel GaN driver with adaptive dead time control scheme, based on an innovative methodology of slope-sensing ZVS detection to minimize the third quadrant conduction time of GaN FETs. Also, a differential-mode noise blanking scheme is proposed to increase the dv/dt noise immunity of the high voltage level shifter. The proposed GaN driver can help to reduce power loss by 1.6W and achieve 90.2% power efficiency at 150V input and 2MHz frequency, or 88.6% power efficiency at 400V input and 1MHz frequency. Traditional non-isolated ZVS converters utilize an auxiliary branch to assist soft-switching operation of the active FET. In multiphase topologies or non-inverting buck-boost topology, each active power FET requires an auxiliary branch such that the total number and volume of auxiliary components make the traditional ZVS scheme infeasible. This dissertation proposes a new passive-saving technique to share one auxiliary branch between two active FETs such that the total number and volume of auxiliary components can be reduced by 50%. It is worth to notice that the proposed passive-saving technique can be applied to both ZVS and ZVT topologies. Traditional ZVT converters adopted fixed on-time of the auxiliary switch for simplicity. Since the auxiliary current ripple cannot scale with the load current, power efficiency at light load condition is quite limited. This dissertation proposes a monolithic control loop to regulate the auxiliary current ripple according to load current. Compared with the traditional ZVT converters, the proposed converter with auxiliary current control scheme can improve light load efficiency by 14.5% without folding back switching frequency.
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.
Download or read book ESSE 2017 written by Yong Wang and published by Walter de Gruyter GmbH & Co KG. This book was released on 2017-10-23 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental science is an interdisciplinary academic field that integrates physical-, biological-, and information sciences to study and solve environmental problems. ESSE - The International Conference on Environmental Science and Sustainable Energy provides a platform for experts, professionals, and researchers to share updated information and stimulate the communication with each other. In 2017 it was held in Suzhou, China June 23-25, 2017.
Book Synopsis Advanced Statistical Modeling, Forecasting, and Fault Detection in Renewable Energy Systems by : Fouzi Harrou
Download or read book Advanced Statistical Modeling, Forecasting, and Fault Detection in Renewable Energy Systems written by Fouzi Harrou and published by BoD – Books on Demand. This book was released on 2020-04-01 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fault detection, control, and forecasting have a vital role in renewable energy systems (Photovoltaics (PV) and wind turbines (WTs)) to improve their productivity, ef?ciency, and safety, and to avoid expensive maintenance. For instance, the main crucial and challenging issue in solar and wind energy production is the volatility of intermittent power generation due mainly to weather conditions. This fact usually limits the integration of PV systems and WTs into the power grid. Hence, accurately forecasting power generation in PV and WTs is of great importance for daily/hourly efficient management of power grid production, delivery, and storage, as well as for decision-making on the energy market. Also, accurate and prompt fault detection and diagnosis strategies are required to improve efficiencies of renewable energy systems, avoid the high cost of maintenance, and reduce risks of fire hazards, which could affect both personnel and installed equipment. This book intends to provide the reader with advanced statistical modeling, forecasting, and fault detection techniques in renewable energy systems.
Book Synopsis Gallium Nitride-enabled High Frequency and High Efficiency Power Conversion by : Gaudenzio Meneghesso
Download or read book Gallium Nitride-enabled High Frequency and High Efficiency Power Conversion written by Gaudenzio Meneghesso and published by Springer. This book was released on 2018-05-12 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book demonstrates to readers why Gallium Nitride (GaN) transistors have a superior performance as compared to the already mature Silicon technology. The new GaN-based transistors here described enable both high frequency and high efficiency power conversion, leading to smaller and more efficient power systems. Coverage includes i) GaN substrates and device physics; ii) innovative GaN -transistors structure (lateral and vertical); iii) reliability and robustness of GaN-power transistors; iv) impact of parasitic on GaN based power conversion, v) new power converter architectures and vi) GaN in switched mode power conversion. Provides single-source reference to Gallium Nitride (GaN)-based technologies, from the material level to circuit level, both for power conversions architectures and switched mode power amplifiers; Demonstrates how GaN is a superior technology for switching devices, enabling both high frequency, high efficiency and lower cost power conversion; Enables design of smaller, cheaper and more efficient power supplies.
Download or read book INTELEC'03 written by and published by . This book was released on 2003 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Performance Soft Switching Switch Mode Power Supply by : Saha Shib Sankar
Download or read book Improved Performance Soft Switching Switch Mode Power Supply written by Saha Shib Sankar and published by . This book was released on 2023-02-16 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A modified version of new fully soft-switched boost converter suitable for active power factor correction has been developed in t This modified converter uses an auxiliary circuit consisting of less number of components than the earlier version. Both the switches of this converter turn on with ZCS and turn off with ZVS.
Book Synopsis Power Converters for Electric Vehicles by : L. Ashok Kumar
Download or read book Power Converters for Electric Vehicles written by L. Ashok Kumar and published by CRC Press. This book was released on 2020-12-11 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power Converters for Electric Vehicles gives an overview, topology, design, and simulation of different types of converters used in electric vehicles (EV). It covers a wide range of topics ranging from the fundamentals of EV, Hybrid EV and its stepwise approach, simulation of the proposed converters for real-time applications and corresponding experimental results, performance improvement paradigms, and overall analysis. Drawing upon the need for novel converter topologies, this book provides the complete solution for the power converters for EV applications along with simulation exercises and experimental results. It explains the need for power electronics in the improvement of performance in EV. This book: Presents exclusive information on the power electronics of EV including traction drives. Provides step-by-step procedure for converter design. Discusses various topologies having different isolated and non-isolated converters. Describes control circuit design including renewable energy systems and electrical drives. Includes practical case studies incorporated with simulation and experimental results. Power Converters for Electric Vehicles will provide researchers and graduate students in Power Electronics, Electric Drives, Vehicle Engineering a useful resource for stimulating their efforts in this important field of the search for renewable technologies.
Book Synopsis Next Generation Power Factor Correction (PFC) Regulator Based on Silicon Carbide (SiC) Power Devices and New Control Strategy by :
Download or read book Next Generation Power Factor Correction (PFC) Regulator Based on Silicon Carbide (SiC) Power Devices and New Control Strategy written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As information and semiconductor technologies continue to develop, power supplies for applications such as telecommunications and computer systems are required to have higher power ratings, smaller volumes, and higher transfer efficiencies. The PFC stage, a key component of distributed power systems present in the front end of AC/DC converters, is an excellent target for increasing the power density and efficiency of the power supply, as it contains several large passive components. However, conventional commercial PFC designs are constrained by several limitations that prevent them from achieving the desired high power densities and efficiencies. In this dissertation, multiple techniques have been investigated to improve the power density and power efficiency of PFC boost converters. For a Continuous Conduction Mode (CCM) PFC converter, increasing the switching frequency at which the converter operates can dramatically reduce the volume of the boost inductor, while the EMI filter size can be reduced if the switching frequency is higher than 400kHz. To achieve high frequency operation, cutting edge SiC power devices are promising candidates for implementation into CCM PFC converters operating at switching frequencies into the MHz range due to their small on-state resistance and junction capacitance. Theoretical analysis and experimental results prove that extremely high power density can be obtained in a single phase 1MHz CCM PFC converter with SiC power devices, however, this converterâ€"! efficiency falls short of the 95% efficiency target. A good compromise between high power density and power efficiency is achieved by employing multiphase interleaving architecture and SiC power devices simultaneously. This dissertation proposes novel nonlinear control architecture to simplify the controller design of multiphase interleaved CCM PFC regulators. PFC converters operating in Critical Mode (CRM) achieve high power efficiency by employing soft switching techniques, but.
Download or read book Proceedings IECON. written by and published by . This book was released on 1991 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Efficiency Improvement and Dynamics Analysis of a Switching Power System: Power Factor Correction and Soft Switching Technique by : 謝仁正
Download or read book Efficiency Improvement and Dynamics Analysis of a Switching Power System: Power Factor Correction and Soft Switching Technique written by 謝仁正 and published by . This book was released on 2009 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IEEE International Symposium on Industrial Electronics Proceedings by :
Download or read book IEEE International Symposium on Industrial Electronics Proceedings written by and published by . This book was released on 2003 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energy Efficiency in Electric Motors, Drives, Power Converters and Related Systems by : Mario Marchesoni
Download or read book Energy Efficiency in Electric Motors, Drives, Power Converters and Related Systems written by Mario Marchesoni and published by MDPI. This book was released on 2020-06-25 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, there is a great deal of attention focused on sustainable growth worldwide. The increase in efficiency in the use of energy may even, in this historical moment, bring greater benefit than the use of renewable energies. Electricity appears to be the most sustainable of energies and the most promising hope for a planet capable of growing without compromising its own health and that of its inhabitants. Power electronics and electrical drives are the key technologies that will allow energy savings through the reduction of energy losses in many applications. This Special Issue has collected several scientific contributions related to energy efficiency in electrical equipment. Some articles are dedicated to the use and optimization of permanent magnet motors, which allow obtaining the highest level of efficiency. Most of the contributions describe the energy improvements that can be achieved with power electronics and the use of suitable control techniques. Last but not least, some articles describe interesting solutions for hybrid vehicles, which were created mainly to save energy in the smartest way possible.
Book Synopsis Soft-switching DC-DC Converters by : Ahmad Mousavi
Download or read book Soft-switching DC-DC Converters written by Ahmad Mousavi and published by . This book was released on 2013 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power electronics converters are implemented with switching devices that turn on and off while power is being converted from one form to another. They operate with high switching frequencies to reduce the size of the converters' inductors, transformers and capacitors. Such high switching frequency operation, however, increases the amount of power that is lost due to switching losses and thus reduces power converter efficiency. Switching losses are caused by the overlap of switch voltage and switch current during a switching transition. If, however, either the voltage across or the current flowing through a switch is zero during a switching transition, then there is no overlap of switch voltage and switch current so in theory, there are no switching losses. Techniques that ensure that this happens are referred to as soft-switching techniques in the power electronics literature and there are two types: zero-voltage switching (ZVS) and zero-current switching (ZCS). For pulse-width modulated (PWM) Dc-Dc converters, both ZVS and ZCS are typically implemented with auxiliary circuits that help the main power switches operate with soft-switching. Although these auxiliary circuits do help improve the efficiency of the converters, they increase their cost. There is, therefore, motivation to try to make these auxiliary circuits as simple and as inexpensive as possible. Three new soft-switching Dc-Dc PWM converters are proposed in this thesis. For each converter, a very simple auxiliary circuit that consists of only a single active switching device and a few passive components is used to reduce the switching losses in the main power switches. The outstanding feature of each converter is the simplicity of its auxiliary circuit, which unlike most other previously proposed converters of similar type, avoids the use of multiple active auxiliary switches. In this thesis, the operation of each proposed converter is explained, analyzed, and the results of the analysis are used to develop a design procedure to select key component values. This design procedure is demonstrated with an example that was used in the implementation of an experimental prototype. The feasibility of each proposed converter is confirmed with experimental result obtained from a prototype converter.
