Relevant bibliographies by topics / High efficiency DC-DC conversion

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'High efficiency DC-DC conversion'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "High efficiency DC-DC conversion"

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Liang, Tsorng-Juu, and Jian-Hsieng Lee. "Novel High-Conversion-Ratio High-Efficiency Isolated Bidirectional DC–DC Converter." IEEE Transactions on Industrial Electronics 62, no. 7 (2015): 4492–503. http://dx.doi.org/10.1109/tie.2014.2386284.

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Tomaszuk, A., and A. Krupa. "High efficiency high step-up DC/DC converters - a review." Bulletin of the Polish Academy of Sciences: Technical Sciences 59, no. 4 (2011): 475–83. http://dx.doi.org/10.2478/v10175-011-0059-1.

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High efficiency high step-up DC/DC converters - a reviewThe renewable energy sources such as PV modules, fuel cells or energy storage devices such as super capacitors or batteries deliver output voltage at the range of around 12 to 70 VDC. In order to connect them to the grid the voltage level should be adjusted according to the electrical network standards in the countries. First of all the voltage should be stepped up to sufficient level at which the DC/AC conversion can be performed to AC mains voltage requirements. Overall performance of the renewable energy system is then affected by the efficiency of step-up DC/DC converters, which are the key parts in the system power chain. This review is focused on high efficiency step-up DC/DC converters with high voltage gain. The differentiation is based on the presence or lack of galvanic isolation. A comparison and discussion of different DC/DC step-up topologies will be performed across number of parameters and presented in this paper.
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Dancy, A. P., R. Amirtharajah, and A. P. Chandrakasan. "High-efficiency multiple-output DC-DC conversion for low-voltage systems." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 8, no. 3 (2000): 252–63. http://dx.doi.org/10.1109/92.845892.

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CHANG, YUEN-HAW. "HIGH-GAIN/EFFICIENCY MULTISTAGE SWITCHED-CAPACITOR-VOLTAGE-MULTIPLIER DC–DC CONVERTER." Journal of Circuits, Systems and Computers 21, no. 03 (2012): 1250023. http://dx.doi.org/10.1142/s0218126612500235.

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A closed-loop interleaved multistage switched-capacitor-voltage-multiplier (mc × nc-stage SCVM) dc–dc converter is proposed by combining a variable-conversion-ratio (VCR) and pulse-width-modulation (PWM) control for low-power step-up conversion and high-efficiency regulation. In this SCVM, the power part is composed of two mc-stage SC cells (front) and two nc-stage SC cells (rear) in cascade, and these cells are operated by two-phase nonoverlapping clocks for an interleaved operation with voltage gain of mc × nc at most. This paper presents the VCR control to change the running stage number m,n and topological path for a more flexible and suitable gain level m × n (1 × 1, 2 × 1, 2 × 2, 3 × 1, 3 × 2, 3 × 3,…, mc × nc) according to the desired output so as to improve power efficiency, especially for the lower output. Besides, PWM is adopted not only to enhance output regulation for different outputs, but also to reinforce output robustness to source/loading variation. Further, some theoretical analysis and design include: SCVM model, steady-state analysis, conversion ratio, power efficiency, output ripple, stability, capacitance selection, and control design. Finally, the closed-loop SCVM is simulated, and the hardware is implemented and tested. All the results are illustrated to show the efficacy of the proposed scheme.
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Li, W., and X. He. "ZVT interleaved boost converters for high-efficiency, high step-up DC–DC conversion." IET Electric Power Applications 1, no. 2 (2007): 284. http://dx.doi.org/10.1049/iet-epa:20060239.

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Xu, Zhen, and Guo Xing Zhang. "Synchronous Rectification Strategy for LLC Resonant DC-DC Converter." Advanced Materials Research 317-319 (August 2011): 2138–43. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.2138.

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High efficiency /high power density is one of the hottest research spots in power electronics technique. Due to simple structure and high conversion efficiency, the LLC resonant DC-DC converter has great utilization potential in many application areas. To improve the conversion efficiency and the power density further, synchronous rectifier is widely adopted at the secondary-side. Based on the existed synchronous rectified LLC resonant DC-DC converter reviewed in this paper, advantages and disadvantages are analyzed and compared in detail. A novel primary-side current sensing strategy and a new current driving method for voltage-doubler rectifier are presented. Finally, this paper proposes a family of novel single package structure for synchronous rectifier from the view point of power electronics integration to improve the performance further.
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Ali Azam Khan, Md, and Mohammad Ali Choudhury. "Efficient Voltage Regulation with Modified Hybrid SEPIC DC-DC-Converter." MATEC Web of Conferences 160 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201816002004.

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Switch mode dc-dc converters are attractive for their small size, ease of control and efficient power conversion. Output voltage is regulated by duty cycle control of semiconductor switch of switch mode dc-dc converters. The voltage gain and efficiency of practical switching regulators deviate from ideal values at extreme duty cycles. Also, desired gain /attenuation is not achievable at high/low duty cycles. In applications where high gain or high attenuation of voltage is desired with acceptable energy conversion efficiency, hybrid dc-dc switching converters are used. Hybrid dc-dc converters are combination of voltage multiplier/division circuit with appropriate SMPS circuits. By incorporating voltage multiplier/division cell with conventional SEPIC converters, desired voltage gain (either very low or very high) may be achieved at acceptable energy conversion efficiency. In the present work with an aim to attain very high voltage gain by conventional SEPIC topologies, a new voltage multiplier cell consisting of multiple inductors and diodes is proposed.
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Petit, Pierre, Abdallah Zgaoui, Jean-Paul Sawicki, Michel Aillerie, and Jean-Pierre Charles. "New architecture for high efficiency DC-DC converter dedicated to photovoltaic conversion." Energy Procedia 6 (2011): 688–94. http://dx.doi.org/10.1016/j.egypro.2011.05.078.

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Choi, Jae-Yeon, and Woo-Young Choi. "High-Efficiency DC-DC Converter with Improved Dynamic Response Characteristics for Modular Photovoltaic Power Conversion." Transactions of the Korean Institute of Power Electronics 18, no. 1 (2013): 54–62. http://dx.doi.org/10.6113/tkpe.2013.18.1.54.

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Li, Wen Yuan, and Jun Zhang. "PWM/PFM Dual-Mode Synchronous Boost DC-DC Regulator." Applied Mechanics and Materials 380-384 (August 2013): 3209–12. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3209.

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a novel peak current PWM/PFM dual-mode boost dc-dc regulator applying for neural signal regeneration is proposed in this paper. The converter can adaptively switch between pulse-width modulation (PWM) and pulse-frequency modulation (PFM) both with relatively high conversion efficiency. Soft-start circuit is designed to eliminate the surge current at the start up stage of the regulator, other protection modules are also contained. The paper analyzes the model and stability of the system. The operation frequency of the regulator is 1MHz. The simulation results show the efficiency of the system is relatively high in PWM mode, up to 95%, in PFM mode it also has good efficiency.
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Dissertations / Theses on the topic "High efficiency DC-DC conversion"

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Shillington, Rory Brendan. "Silicon Carbide Devices in High Efficiency DC-DC Power Converters for Telecommunications." Thesis, University of Canterbury. Electrical and Computer Engineering, 2012. http://hdl.handle.net/10092/7504.

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The electrical efficiency of telecommunication power supplies is increasing to meet customer demands for lower total cost of ownership. Increased capital cost can now be justified if it enables sufficiently large energy savings, allowing the use of topologies and devices previously considered unnecessarily complex or expensive. Silicon carbide Schottky diodes have already been incorporated into commercial power supplies as expensive, but energy saving components. This thesis pursues the next step of considering silicon carbide transistors for use in telecommunications power converters. A range of silicon carbide transistors was considered with a primary focus on recently developed, normally-off, junction field effect transistors. Tests were devised and performed to uncover a number of previously unpublished characteristics of normally-off silicon carbide JFETs. Specifically, unique reverse conduction and associated gate current draw relationships were measured as well as the ability to block small reverse voltages when a negative gate-source voltage is applied. Reverse recovery-like characteristics were also measured and found to be superior to those of silicon MOSFETs. These characteristics significantly impact the steps that are required to maximize efficiency with normally-off SiC JFETs in circuits where synchronous rectification or bidirectional blocking is performed. A gate drive circuit was proposed that combines a number of recommendations to achieve rapid and efficient switching of normally-off SiC JFETs. Specifically, a low transient output impedance was provided to achieve rapid turn-on and turn-off transitions as well as a high dc output impedance to limit the steady state drive current while sustaining the turned-on state. A prototype circuit was constructed using building blocks that are typically found in single chip MOSFET drivers. The circuit was shown to operate well from a single supply, alleviating the need for a split supply such as that required by many published JFET drive circuits. This demonstrated a proof of concept for a single chip JFET driver solution. An active power factor correction circuit topology was extensively modelled and a prototype designed and tested to verify the model. The circuit was able to operate at switching frequencies in excess of 100kHz when using SiC JFETs, whereas silicon MOSFETs could only achieve switching frequencies of several kHz before switching losses became excessive. The circuit was designed as the dc equivalent for a 2kW, 230V AC input power converter with a split +/-400V dc output. A commercial single phase telecommunications power converter was modified to utilise normally-off SiC JFETs in its power factor correction circuit. The converter was tested and found to achieve similar electrical efficiency with 1200V SiC JFETs to that achieved with 600V silicon MOSFETs. The performance of the 1200V SiC JFETs in this application was also compared to that of 900V silicon MOSFETs and found to be superior. Finally, a prototype three-phase cyclo-converter was modified to use 1200V normallyoff SiC JFETs in place of 600V silicon MOSFETs and found to achieve similar electrical efficiency to the silicon MOSFETs in a 208V three phase system. These results strongly indicate that the 1200V SiC JFETs would provide better performance than 900V silicon MOSFETs in a 400V three phase system (that had been considered for commercial development).
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Zhao, Xiaonan. "High-Efficiency and High-Power Density DC-DC Power Conversion Using Wide Bandgap Devices for Modular Photovoltaic Applications." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/89025.

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With the development of solar energy, power conversion systems responsible for energy delivering from photovoltaic (PV) modules to ac or dc grid attract wide attentions and have significantly increased installations worldwide. Modular power conversion system has the highest efficiency of maximum power point tacking (MPPT), which can transfer more solar power to electricity. However, this system suffers the drawbacks of low power conversion efficiency and high cost due to a large number of power electronics converters. High-power density can provide potentials to reduce cost through the reduction of components and potting materials. Nowadays, the power electronics converters with the conventional silicon (Si) based power semiconductor devices are developed maturely and have limited improvements regarding in power conversion efficiency and power density. With the availability of wide bandgap devices, the power electronics converters have extended opportunities to achieve higher efficiency and higher power density due to the desirable features of wide bandgap devices, such as low on-state resistance, small junction capacitance and high switching speed. This dissertation focuses on the application of wide bandgap devices to the dc-dc power conversion for the modular PV applications in an effort to improve the power conversion efficiency and power density. Firstly, the structure of gallium-nitride (GaN) device is studied theoretically and characteristics of GaN device are evaluated under testing with both hard-switching and soft-switching conditions. The device performance during steady-state and transitions are explored under different power level conditions and compared with Si based devices. Secondly, an isolated high-efficiency GaN-based dc-dc converter with capability of wide range regulation is proposed for modular PV applications. The circuit configuration of secondary side is a proposed active-boost-rectifier, which merges a Boost circuit and a voltage-doubler rectifier. With implementation of the proposed double-pulse duty cycle modulation method, the active-boost-rectifier can not only serve for synchronous rectification but also achieve the voltage boost function. The proposed converter can achieve zero-voltage-switching (ZVS) of primary side switches and zero-current-switching (ZCS) of secondary side switches regardless of the input voltages or output power levels. Therefore, the proposed converter not only keeps the benefits of highly-efficient series resonant converter (SRC) but also achieves a higher voltage gain than SRC and a wide range regulation ability without adding additional switches while operating under the fixed-frequency condition. GaN devices are utilized in both primary and secondary sides. A 300-W hardware prototype is built to achieve a peak efficiency of 98.9% and a California Energy Commission (CEC) weighted efficiency of 98.7% under nominal input voltage condition. Finally, the proposed converter is designed and optimized at 1-MHz switching frequency to pursue the feature of high-power density. Considering the ac effects under high frequency, the magnetic components and PCB structure are optimized with finite element method (FEM) simulations. Compared with 140-kHz design, the volume of 1-MHz design can reduce more than 70%, while the CEC efficiency only drops 0.8% at nominal input voltage condition. There are also key findings on circuit design techniques to reduce parasitic effects. The parasitic inductances induced from PCB layout of primary side circuit can cause the unbalanced resonant current between positive and negative half cycles if the power loops of two half cycles have asymmetrical parasitic inductances. Moreover, these parasitic inductances reflecting to secondary side should be considered into the design of resonant inductance. The parasitic capacitances of secondary side could affect ZVS transitions and increase the required magnetizing current. Because of large parasitic capacitances, the dead-time period occupies a large percentage of entire switching period in MHz operations, which should be taken into consideration when designing the resonant frequency of resonant network.<br>Doctor of Philosophy<br>Solar energy is one of the most promising renewable energies to replace the conventional fossils. Power electronics converters are necessary to transfer power from solar panels to dc or ac grid. Since the output of solar panel is low voltage with a wide range and the grid side is high voltage, this power converter should meet the basic requirements of high step up and wide range regulation. Additionally, high power conversion efficiency is an important design purpose in order to save energy. The existing solutions have limitations of narrow regulating range, low efficiency or complicated circuit structure. Recently, the third-generation power semiconductors attract more and more attentions who can help to reduce the power loss. They are named as wide band gap devices. This dissertation proposed a wide band gap devices based power converter with ability of wide regulating range, high power conversion efficiency and simple circuit structure. Moreover, this proposed converter is further designed for high power density, which reduces more than 70% of volume. In this way, small power converter can merge into the junction box of solar panel, which can reduce cost and be convenient for installations.
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LaBella, Thomas Matthew. "A High-Efficiency Hybrid Resonant Microconverter for Photovoltaic Generation Systems." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/50526.

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The demand for increased renewable energy production has led to increased photovoltaic (PV) installations worldwide. As this demand continues to grow, it is important that the costs of PV installations decrease while the power output capability increases. One of the components in PV installations that has lots of room for improvement is the power conditioning system. The power conditioning system is responsible for converting the power output of PV modules into power useable by the utility grid while insuring the PV array is outputting the maximum available power. Modular power conditioning systems, where each PV module has its own power converter, have been proven to yield higher output power due to their superior maximum power point tracking capabilities. However, this comes with the disadvantages of higher costs and lower power conversion efficiencies due to the increased number of power electronics converters. The primary objective of this dissertation is to develop a high-efficiency, low cost microconverter in an effort to increase the output power capability and decrease the cost of modular power conditioning systems. First, existing isolated dc-dc converter topologies are explored and a new topology is proposed based on the highly-efficient series resonant converter operating near the series resonant frequency. Two different hybrid modes of operation are introduced in order to add wide input-voltage regulation capability to the series resonant converter while achieving high efficiency through low circulating currents, zero-current switching (ZCS) of the output diodes, zero-voltage switching (ZVS) and/or ZCS of the primary side active switches, and direct power transfer from the source to the load for the majority of the switching cycle. Each operating mode is analyzed in detail using state-plane trajectory plots. A systematic design approach that is unique to the newly proposed converter is presented along with a detailed loss analysis and loss model. A 300-W microconverter prototype is designed to experimentally validate the analysis and loss model. The converter featured a 97.7% weighted California Energy Commission (CEC) efficiency with a nominal input voltage of 30 V. This is higher than any other reported CEC efficiency for PV microconverters in literature to date. Each operating mode of the proposed converter can be controlled using simple fixed-frequency pulse-width modulation (PWM) based techniques, which makes implementation of control straightforward. Simplified models of each operating mode are derived as well as control-to-input voltage transfer functions. A smooth transition method is then introduced using a two-carrier PWM modulator, which allows the converter to transition between operating modes quickly and smoothly. The performance of the voltage controllers and transition method were verified experimentally. To ensure the proposed converter is compatible with different types of modular power conditioning system architectures, system-level interaction issues associated with different modular applications are explored. The first issue is soft start, which is necessary when the converter is beginning operation with a large capacitive load. A novel soft start method is introduced that allows the converter to start up safely and quickly, even with a short-circuited output. Maximum power point tracking and double line frequency ripple rejection are also explored, both of which are very important to ensuring the PV module is outputting the maximum amount of available power. Lastly, this work deals with efficiency optimization of the proposed converter. It is possible to use magnetic integration so that the resonant inductor can be incorporated into the isolation transformer by way of the transformer leakage inductance in order to reduce parts count and associated costs. This chapter, however, analyzes the disadvantages to this technique, which are increased proximity effect losses resulting in higher conduction losses. A new prototype is designed and tested that utilizes an external resonant inductor and the CEC efficiency was increased from 97.7% to 98.0% with a marginal 1.8% total cost increase. Additionally, a variable frequency efficiency optimization algorithm is proposed which increases the system efficiency under the high-line and low-line input voltage conditions. This algorithm is used for efficiency optimization only and not control, so the previously presented simple fixed-frequency modeling and control techniques can still be utilized.<br>Ph. D.
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Yan, Jinghui. "Full Bridge LLC Converter Secondary Architecture Study for Photovoltaic Application." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/82490.

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The increasing global energy demand calls for attention on renewable energy development. Among the available technology, the photovoltaic (PV) panels is a popular solution. Thus, targeted Power Conditioning Systems (PCSs) are drawing increased attention in research. Microconverter is one of the PCS that can support versatile applications in various power line architectures. This work focuses on the comparison of circuit secondary side architectures for LLC converter for microconverter application. As the research foundation, general characteristic of solar energy and PV panel operation are introduced for the understanding of the needs. Previous works are referenced and compared for advantages and limitation. Base on conventional secondary resonant full bridge LLC converter, the two sub-topologies of different secondary rectification network: active, full bridge secondary and active voltage doubler output end LLC converter are presented in detail. The main operating principle is also described in mathematical formula with the corresponding cycle-by-cycle operation to ensure the functional equality before proceeding to performance comparison. Circuit efficiency analysis is conducted on the main power stage and the key components with frequency consideration. The hardware circuit achieved the designed function while the overall hardware efficiency result agrees with analysis. In the implementation, the transformer is costume built for the system pacification. Another part is the parasitic effect analysis. At a high operating frequency and to achieve very high-frequency operation, parasitic effect need to be fully understood and considered as it may have the dominating effect on the system.<br>Master of Science
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Yang, Gang. "Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles." Thesis, Supélec, 2014. http://www.theses.fr/2014SUPL0011/document.

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Cette thèse traite de la conception d’un convertisseur DC / DC destiné aux véhicules électriques et hybrides (2,5 kW, 400V/14V, 250kHz). Dérivé de la topologie LLC à résonance, ce convertisseur bénéficie des nombreux avantages propres à cette structure particulière. C’est ainsi que le prototype réalisé présente un rendement très élevé, une densité de puissance très forte avec des perturbations EMI très réduites. La première partie de cette thèse est consacrée à l’analyse théorique du circuit LLC afin de dégager un modèle de conversion et une stratégie de contrôle adaptée à l’application visée. Afin de conserver un rendement important sur une large plage de charge, une structure basée sur la mise en parallèle de deux modules LLC est proposée. Une nouvelle stratégie de contrôle à deux boucles est également proposée pour équilibrer le courant entre les deux modules. La seconde partie de la thèse fait appel à la simulation et à l’expérimentation. Il s’agit de minimiser la masse et l’encombrement tout en maximisant le rendement. Un composant magnétique spécial est conçu puis dimensionné pour intégrer le transformateur et diverses inductances de résonance. Ce convertisseur met également en œuvre un système de redressement synchrone robuste avec une compensation de phase, un module de puissance avec une résistance thermique très faible et un système de refroidissement efficace par air. Le rendement maximal mesuré est 95%. Le rendement demeure supérieur à 94% sur une plage de puissance s’étalant de 500 W à 2 kW. La densité de puissance est 1W/cm3. La CEM du convertisseur est développée dans cette thèse<br>In this dissertation, a 2.5kW 400V/14V, 250kHz DC/DC converter prototype is developed targeted for electric vehicle/hybrid vehicle applications. Benefiting from numerous advantages brought by LLC resonant topology, this converter is able to perform high efficiency, high power density and low EMI. A first part of this dissertation is the theoretical analysis of LLC: topology analysis, electrical parameter calculation and control strategy. To arrange high output current, this thesis proposes parallel connected LLC structure with developed novel double loop control to realize an equal current distribution. The second part concerns on the system amelioration and efficiency improvement of developed LLC. A special transformer is dimensioned to integrate all magnetic components, and various types of power losses are quantified based on different realization modes and winding geometries to improve its efficiency. This converter also implements a robust synchronous rectification system with phase compensation, a power semiconductor module, and an air-cooling system. The power conversion performance of this prototype is presented and the developed prototype has a peak efficiency of 95% and efficiency is higher than 94% from 500W to 2kW, with a power density of 1W/cm3. The CEM analysis of this converter is also developed in this thesis
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Samir, Anass. "Conception de solutions basses puissances et optimisation de la gestion d'énergie de circuits dédiés aux applications mixtes." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4700.

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Depuis trois décennies, la tendance du marché répond à la demande actuelle de miniaturisation et d'augmentation de performances des appareils multimédias. Or, toute réduction des dimensions d'un facteur donné impose une diminution des tensions (pour des raisons de fiabilité). Afin d'y répondre, la réduction de taille des circuits intégrés CMOS atteint des échelles d'intégration submicroniques entrainant une baisse importante de la fiabilité des composants et en particulier des transistors. La création de porteurs chauds, ainsi que la dissipation thermique à l'intérieur des circuits submicroniques, sont les deux phénomènes physiques principaux à l'origine de la baisse de fiabilité. La solution technique permettant de garder un bon degré de fiabilité, tout en réduisant la taille des composants, consiste à réduire la tension d'alimentation des circuits. Parallèlement aux contraintes de performances, les normes environnementales demandent une consommation la plus réduite possible. La difficulté consiste alors en la réalisation de circuits associant une alimentation basse puissance (tension et courant) d'où la notion de circuits " Low Power ". Ces circuits sont pour certains déjà utilisés dans le domaine du multimédia, du médical, avec des contraintes d'intégration différentes (possibilité de composants externes, stabilité, etc.). L'augmentation des performances en vitesse des circuits digitaux nécessite par ailleurs l'utilisation de technologies générant des fuites de plus en plus importantes qui sont incompatibles avec une réduction de la consommation dans des modes de veille sans la mise en place de nouvelles techniques<br>For three decades, the market trend answers the current demand of miniaturization and performance increase of the multimedia devices. Yet, any reduction of the dimensions of a given factor imposes a decrease of the tensions (for reasons of reliability). To answer this question, the downsizing of CMOS integrated circuits reaches submicron scales of integration resulting in a significant decrease in the reliability of components and in particular transistors. The hot carriers creations, as well as heat dissipation within the submicron circuits, are the two main physical phenomena behind the reliability decline. The technical solution to maintain a good degree of reliability, while reducing component size, is to reduce the supply voltage of circuits. In parallel to performance constraints, environmental standards require consumption as small as possible. The challenge is then to build circuits combining low power supply (voltage and current) where the concept of circuits "Low Power". These circuits are used for some already in the field of multimedia, medical, integration with various constraints (possibility of external components, stability, etc..). The speed increase performance of digital circuits also requires the use of technologies that generate leaks increasingly important that are inconsistent with consumption reduction in standby modes without the introduction of new techniques
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Saini, Dalvir K. "Gallium Nitride: Analysis of Physical Properties and Performance in High-Frequency Power Electronic Circuits." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1438013888.

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Wang, Xiangcheng. "HIGH SLEW RATE HIGH-EFFICIENCY DC-DC CONVERTER." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3196.

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Active transient voltage compensator (ATVC) has been proposed to improve VR transient response at high slew rate load, which engages in transient periods operating in MHZ to inject high slew rate current in step up load and recovers energy in step down load. Main VR operates in low switching frequency mainly providing DC current. Parallel ATVC has largely reduced conduction and switching losses. Parallel ATVC also reduces the number of VR bulk capacitors. Combined linear and adaptive nonlinear control has been proposed to reduce delay times in the actual controller, which injects one nonlinear signal in transient periods and simplifies the linear controller design. Switching mode current compensator with nonlinear control in secondary side is proposed to eliminate the effect of opotocoupler, which reduces response times and simplifies the linear controller design in isolated DC-DC converters. A novel control method has been carried out in two-stage isolated DC-DC converter to simplify the control scheme and improve the transient response, allowing for high duty cycle operation and large step-down voltage ratio with high efficiency. A balancing winding network composed of small power rating components is used to mitigate the double pole-zero effect in complementary-controlled isolated DC-DC converter, which simplifies the linear control design and improves the transient response without delay time. A parallel post regulator (PPR) is proposed for wide range input isolated DC-DC converter with secondary side control, which provides small part of output power and most of them are handled by unregulated rectifier with high efficiency. PPR is easy to achieve ZVS in primary side both in wide range input and full load range due to 0.5 duty cycle. PPR has reduced conduction loss and reduced voltage rating in the secondary side due to high turn ratio transformer, resulting in up to 8 percent efficiency improvement in the prototype compared to conventional methods.<br>Ph.D.<br>School of Electrical Engineering and Computer Science<br>Engineering and Computer Science<br>Electrical Engineering
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Li, Yanchao. "High Power Density and High Efficiency DC-DC Converters." Diss., North Dakota State University, 2018. https://hdl.handle.net/10365/28879.

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Rahimi, Arian. "Design And Implementation Of Low Power Interface Electronics For Vibration-based Electromagnetic Energy Harvesters." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613820/index.pdf.

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For many years batteries have been used as the main power sources for portable electronic devices. However, the rate of scaling in integrated circuits and micro-electro-mechanical systems (MEMS) has been much higher than that of the batteries technology. Therefore, a need to replace these temporary energy reservoirs with small sized continuously charged energy supply units has emerged. These units, named as energy harvesters, use several types of ambient energy sources such as heat, light, and vibration to provide energy to intelligent systems such as sensor nodes. Among the available types, vibration based electromagnetic (EM) energy harvesters are particularly interesting because of their simple structure and suitability for operation at low frequency values (&lt<br>10 Hz), where most vibrations exits. However, since the generated EM power and voltage is relatively low at low frequencies, high performance interface electronics is required for efficiently transferring the generated power from the harvester to the load to be supplied. The aim of this study is to design low power and efficient interface electronics to convert the low voltage and low power generated signals of the EM energy harvesters to DC to be usable by a real application. The most critical part of such interface electronics is the AC/DC converter, since all the other blocks such as DC/DC converters, power managements units, etc. rely on the rectified voltage generated by this block. Due to this, several state-of-the-art rectifier structures suitable for energy harvesting applications have been studied. Most of the previously proposed rectifiers have low conversion efficiency due to the high voltage drop across the utilized diodes. In this study, two rectifier structures are proposed: one is a new passive rectifier using the Boot Strapping technique for reducing the diode turn-on voltage values<br>the other structure is a comparator-based ultra low power active rectifier. The proposed structures and some of the previously reported designs have been implemented in X-FAB 0.35 &micro<br>m standard CMOS process. The autonomous energy harvesting systems are then realized by integrating the developed ASICs and the previously proposed EM energy harvester modules developed in our research group, and these systems have been characterized under different electromechanical excitation conditions. In this thesis, five different systems utilizing different circuits and energy harvesting modules have been presented. Among these, the system utilizing the novel Boot Strap Rectifier is implemented within a volume of 21 cm3, and delivers 1.6 V, 80 &micro<br>A (128 &micro<br>W) DC power to a load at a vibration frequency of only 2 Hz and 72 mg peak acceleration. The maximum overall power density of the system operating at 2 Hz is 6.1 &micro<br>W/cm3, which is the highest reported value in the literature at this operation frequency. Also, the operation of a commercially available temperature sensor using the provided power of the energy harvester has been shown. Another system utilizing the comparator-based active rectifier implemented with a volume of 16 cm3, has a dual rail output and is able to drive a 1.46 V, 37 &micro<br>A load with a maximum power density of 6.03 &micro<br>W/cm3, operating at 8 Hz. Furthermore, a signal conditioning system for EM energy harvesting has also been designed and simulated in TSMC 90 nm CMOS process. The proposed ASIC includes a highly efficient AC-DC converter as well as a power processing unit which steps up and regulates the converted DC voltages using an on-chip DC/DC converter and a sub-threshold voltage regulator with an ultra low power management unit. The total power consumption on the totally passive IC is less than 5 &micro<br>W, which makes it suitable for next generation MEMS-based EM energy harvesters. In the frame of this study, high efficiency CMOS rectifier ICs have been designed and tested together with several vibration based EM energy harvester modules. The results show that the best efficiency and power density values have been achieved with the proposed energy harvesting systems, within the low frequency range, to the best of our knowledge. It is also shown that further improvement of the results is possible with the utilization of a more advanced CMOS technology.
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Books on the topic "High efficiency DC-DC conversion"

1

Chen, Shuo. Ultra-fast and high-effienciency DC/DC conversion for data processing circuits. National Library of Canada, 2003.

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California Energy Commission. Public Interest Energy Research. Challenges and energy-saving opportunities in measuring, reporting, and promoting high efficiency secondary power supplies: PIER final project report. California Energy Commission, 2008.

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Karamat, Asghar. High frequency inverter-transformer-cycloconverter system for DC to AC (3-phase) power conversion. Brunel University, 1991.

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Prohorov, Viktor. Semiconductor converters of electrical energy. INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1019082.

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The textbook considers the need, principles and methods of mutual conversion of parameters of electric energy at DC and AC for stationary and Autonomous objects. Features of operation of power electronics elements in specific conditions of their continuous high-frequency switching are described. Low-current control systems that provide the necessary logic for the operation of Executive power devices of converters are considered. A large number of specific practical electrical diagrams of electric energy converters are given.&#x0D; It is intended for students studying in the direction of 13.03.02 "electric power and electrical engineering". It can be useful for graduate students and specialists involved in the development and operation of electric power converters.
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United States. National Aeronautics and Space Administration., ed. An advanced photovoltaic array regulator module. National Aeronautics and Space Administration, 1996.

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An advanced photovoltaic array regulator module. National Aeronautics and Space Administration, 1996.

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United States. National Aeronautics and Space Administration., ed. An advanced photovoltaic array regulator module. National Aeronautics and Space Administration, 1996.

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Book chapters on the topic "High efficiency DC-DC conversion"

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Ko, Jae-Ha, Chun-Sung Kim, Jong-Cheol Kim, Seong-Mi Park, and Sung-Jun Park. "DC–DC Converter with High Conversion Ratio for Transmission." In Advances in Greener Energy Technologies. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4246-6_26.

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DivyaNavamani, J., A. Lavanya, K. Vijayakumar, and A. Navauga. "Efficiency Modeling of High Gain DC-DC Converter for Renewable Energy Application." In Lecture Notes in Electrical Engineering. Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2119-7_8.

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Wang, Renji, Zhigang Han, and Jian Wu. "Design of a PWM/PFM Buck DC-DC Converter with High Efficiency." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27287-5_49.

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Kim, Ho-Sung, Myung-Hyo Ryu, Ju-Won Baek, Jong-Hyun Kim, and Hee-Je Kim. "High Efficiency Isolated Bidirectional AC-DC Power Converter." In Intelligent Robotics and Applications. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40849-6_30.

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Cai, Jinhe, Jinyong Zhang, Nikolas Gaio, and Lei Wang. "A DC-DC Converter with 91% @55mA Light Load Conversion Efficiency for Portable Medical Electronics." In IFMBE Proceedings. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03005-0_35.

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Sha, Deshang, and Guo Xu. "Hybrid-Bridge-Based DAB Converter with Wide Voltage Conversion Gain." In High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0259-6_3.

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Francioso, L., C. De Pascali, C. Veri, et al. "Heat Sink Free Wearable Thermoelectric System with Low Startup Voltage, High Efficiency DC–DC Converter." In Lecture Notes in Electrical Engineering. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66802-4_26.

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Sha, Deshang, and Guo Xu. "High Efficiency Current-Fed Dual Active Bridge DC–DC Converter with ZVS Achievement Throughout Full Range of Load Using Optimized Switching Patterns." In High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0259-6_8.

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Chee, San-Hwa, and Howard Haensel. "Highly integrated high efficiency DC/DC conversion." In Analog Circuit Design. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-12-800001-4.00105-8.

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Sahraoui, Bouchta, Adil Eddiai, Mounir Meddad, et al. "Functionalization of Specific Electrostrictive Polymers for High Power Harvesting." In Innovative Materials and Systems for Energy Harvesting Applications. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8254-2.ch014.

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The energy harvesting based on electrostrictive polymers has great potential for remote applications such as in vivo sensors, embedded micro-electro-mechanical systems devices. The harvested energy and action are controlled by the permittivity, the Young's modulus and their dependence on frequency and level of stress. One should use a model which takes into account mechanical losses in order to obtain efficient devices. This chapter provides a brief overview of the methods for harvesting mechanical to electrical energy using elestrostrictive polymer. The second paragraph presents two new techniques which enable the improvement of the electromechanical performance of electrostrictive polymers in order to demonstrate their potential for the vibrational energy recovery. Based on the strong relationship between the frequency of operation and the mechanical strain from one could improve the electromechanical conversion. The development of a new prototype based on electrostrictive polymers for increasing the conversion AC–DC power is discussed.
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Conference papers on the topic "High efficiency DC-DC conversion"

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Huang, Daocheng, David Gilham, Weiyi Feng, Pengju Kong, Dianbo Fu, and Fred C. Lee. "High power density high efficiency dc/dc converter." In 2011 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2011. http://dx.doi.org/10.1109/ecce.2011.6063942.

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Hashizaka, Akira, Hiroyuki Oka, Mantaro Nakamura, et al. "High Efficiency Low Noise SMPS System - DC-DC Converter Side." In 2007 Power Conversion Conference - Nagoya. IEEE, 2007. http://dx.doi.org/10.1109/pccon.2007.373123.

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Yang, Min-Kwon, Myung-Chul Lee, and Woo-Young Choi. "High-efficiency bidirectional DC-DC converter with high voltage conversion ratio." In 2017 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2017. http://dx.doi.org/10.1109/apec.2017.7930856.

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Kim, Eun-Soo, Seung-Min Lee, Jun-Hyoung Park, Young-Jae Noh, Han Xu, and Young-Soo Kong. "Resonant DC-DC converter for high efficiency bidirectional power conversion." In 2013 IEEE Applied Power Electronics Conference and Exposition - APEC 2013. IEEE, 2013. http://dx.doi.org/10.1109/apec.2013.6520570.

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Murata, Aya, Satoshi Goto, Terukazu Sato, Kimihiro Nishijima, and Takashi Nabeshima. "Novel high efficiency and high conversion ratio DC-DC converter for EDLC." In 2013 International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 2013. http://dx.doi.org/10.1109/icrera.2013.6749754.

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Nan, Zhanghe, Ming Xu, Julu Sun, Wenchang Han, and Yuan Yao. "Novel DC-DC architecture for high efficiency SMPS with multiple outputs." In 2010 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2010. http://dx.doi.org/10.1109/ecce.2010.5617783.

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Sun, Bingyao, Rolando Burgos, Dushan Boroyevich, Sandeep Bala, and Jing Xu. "10 kW High Efficiency Compact GaN-Based DC/DC Converter Design." In 2018 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2018. http://dx.doi.org/10.1109/ecce.2018.8557541.

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Ishikawa, Ryo, and Kazuhiko Honjo. "High-Efficiency DC-RF/RF-DC Conversion Based on High-Efficiency Power Amplifier Design Technique." In 2020 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT). IEEE, 2020. http://dx.doi.org/10.1109/rfit49453.2020.9226189.

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Chakraborty, Shiladri, and Parthasarathi Sensarma. "High gain high efficiency front end resonant dc-dc boost converter for PV microinverter." In 2012 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2012. http://dx.doi.org/10.1109/ecce.2012.6342825.

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Yu, Wensong, Jih-Sheng Lai, Gianpaolo Lisi, et al. "High efficiency DC-DC converter with twin-bus for dimmable LED lighting." In 2010 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2010. http://dx.doi.org/10.1109/ecce.2010.5617991.

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Reports on the topic "High efficiency DC-DC conversion"

1

Song, Hong-Seok, Jung-Hong Joo, Ho-Gi Kim, and Jinhwan Jung. Development of a High Efficiency Bidirectional DC-DC Converter for FCHEVs. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0074.

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