Готові списки джерел за темами / DC-DC converters (LLC and DAB)

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Добірка наукової літератури з теми "DC-DC converters (LLC and DAB)"

Автор: Grafiati

Опубліковано: 24 січня 2023

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Статті в журналах з теми "DC-DC converters (LLC and DAB)"

Li, Zimeng, Mingxue Li, Yushun Zhao, Zixiang Wang, Dongsheng Yu, and Ruidong Xu. "An Optimized Control Method of Soft-Switching and No Backflow Power for LLC Resonant-Type Dual-Active-Bridge DC-DC Converters." Mathematics 11, no. 2 (January 5, 2023): 287. http://dx.doi.org/10.3390/math11020287.

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Анотація:

The LLC-type resonant dual-active-bridge (LLC-DAB) DC-DC converter with a high voltage gain, high power density, and low backflow power has attracted increasing attention in recent years. However, its soft-switching and backflow power problems are still not solved, so the improvements to these problems are studied in this paper. Based on the dual phase shift (DPS) modulation method, the operating characteristics are analyzed, and a soft-switching and no backflow power modulation curve is established based on the voltage-current time-domain characteristics. On this basis, a soft-switching and no backflow power optimized control method based on DPS modulation is proposed to achieve soft-switching operation and eliminate backflow power. Due to the complex time-domain characteristics of the resonant tank voltage and current, the relationship between the phase shift ratios is fitted and optimized with this method based on the soft-switching and no backflow power characteristic curve, and the optimized results of the phase shift ratio under different operating conditions are obtained. The simulation results indicate that the soft-switching operation of the LLC-DAB converter can be achieved with the optimized control method proposed in this paper, and the backflow power is effectively eliminated.

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Mukherjee, Satyaki, Ashish Kumar, and Sombuddha Chakraborty. "Comparison of DAB and LLC DC–DC Converters in High-Step-Down Fixed-Conversion-Ratio (DCX) Applications." IEEE Transactions on Power Electronics 36, no. 4 (April 2021): 4383–98. http://dx.doi.org/10.1109/tpel.2020.3019796.

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Liu, Chuang, Haiyang Liu, Guowei Cai, Shumei Cui, Haijun Liu, and Hang Yao. "Novel Hybrid LLC Resonant and DAB Linear DC–DC Converter: Average Model and Experimental Verification." IEEE Transactions on Industrial Electronics 64, no. 9 (September 2017): 6970–78. http://dx.doi.org/10.1109/tie.2017.2682784.

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Wang, Minglong, Shangzhi Pan, Xiaoming Zha, Jinwu Gong, Wenqiang Lin, Jingmin Gao, and Qipeng Deng. "Hybrid Control Strategy for an Integrated DAB–LLC–DCX DC–DC Converter to Achieve Full-Power-Range Zero-Voltage Switching." IEEE Transactions on Power Electronics 36, no. 12 (December 2021): 14383–97. http://dx.doi.org/10.1109/tpel.2021.3086633.

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Ríos, Sara J., Daniel J. Pagano, and Kevin E. Lucas. "Bidirectional Power Sharing for DC Microgrid Enabled by Dual Active Bridge DC-DC Converter." Energies 14, no. 2 (January 13, 2021): 404. http://dx.doi.org/10.3390/en14020404.

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Анотація:

Currently, high-performance power conversion requirements are of increasing interest in microgrid applications. In fact, isolated bidirectional dc-dc converters are widely used in modern dc distribution systems. The dual active bridge (DAB) dc-dc converter is identified as one of the most promising converter topology for the mentioned applications, due to its benefits of high power density, electrical isolation, bidirectional power flow, zero-voltage switching, and symmetrical structure. This study presents a power management control scheme in order to ensure the power balance of a dc microgrid in stand-alone operation, where the renewable energy source (RES) and the battery energy storage (BES) unit are interfaced by DAB converters. The power management algorithm, as introduced in this work, selects the proper operation of the RES system and BES system, based on load/generation power and state-of-charge of the battery conditions. Moreover, a nonlinear robust control strategy is proposed when the DAB converters are in voltage-mode-control in order to enhance the dynamic performance and robustness of the common dc-bus voltage, in addition to overcoming the instability problems that are caused by constant power loads and the dynamic interactions of power electronic converters. The simulation platform is developed in MATLAB/Simulink, where a photovoltaic system and battery system are selected as the typical RES and BES, respectively. Assessments on the performance of the proposed control scheme are conducted. Comparisons with the other control method are also provided.

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Suzuki, Tekehiro, Kohji Higuchi, and Kamon Jirasereeamornkul. "Design of A2DOF Controller with Smith Predictor for LLC Current-Resonant DC-DC Converters." Applied Mechanics and Materials 781 (August 2015): 422–26. http://dx.doi.org/10.4028/www.scientific.net/amm.781.422.

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LLC current-resonant converters have greater non-linear characteristics as compared to conventional DC-DC converters. Thus controlling LLC converters is difficult. In particular, the influence of an input delay time isn’t negligible at heavy load. In this paper, an A2DOF (Approximate 2-Degree-Of Freedom) controller with Simith predictor is proposed to compensate the input delay time of LLC current-resonant DC-DC converter. Experimental studies using a microprocessor for the controller demonstrate that this type of digital controller is effective to suppress the influences of the input delay time and the output variations at the sudden load change.

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Ding, Huaxing, Guibin Zou, Ning Ding, and Chuanjie Wang. "Study of the IPOS DC/DC Converter for DC Offshore Wind Farm." Journal of Physics: Conference Series 2320, no. 1 (August 1, 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2320/1/012016.

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Abstract With the development of the offshore wind farms, DC offshore wind farm topology is getting more attention due to its low loss and light weight, where the DC/DC converters with high voltage gain are key equipments. This paper studies the Input-Parallel-Output-Series(IPOS) converter based on Dual-Active-Bridge(DAB) topology, discusses the modulation and control method of the converter, and proposes a fault ride-through scheme. Simulation results validate the proposed topologies and control schemes.

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ElMenshawy, Mena, and Ahmed Massoud. "Medium-Voltage DC-DC Converter Topologies for Electric Bus Fast Charging Stations: State-of-the-Art Review." Energies 15, no. 15 (July 28, 2022): 5487. http://dx.doi.org/10.3390/en15155487.

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With the expansion of E-mobility technology, the demand for Medium-Voltage (MV) Electric Buses (E-buses) charging infrastructure has significantly increased. In this regard, the effective connection of E-bus chargers to a medium voltage power grid is essential to provide fast charging and carry out multiple charging processes simultaneously. One of the main building blocks for E-bus charging is the DC-DC converter stage responsible for regulating the power flow and matching the different voltage and power levels. Accordingly, this paper presents a comprehensive review of DC-DC converter topologies applicable to MV E-bus fast charging. This review discusses and compares the basic isolated DC-DC converter topologies. In addition, the DC-DC converters are classified based on their conversion stages. Moreover, isolated DC-DC converter topologies applicable for MV E-bus fast charging applications, including Dual Active Bridge (DAB) modular-based structure converter and Modular Multilevel Converter (MMC)-based DAB, are discussed where the merits and demerits of each topology are highlighted. Moreover, this review illustrates how DAB converters are employed in different power level applications through the multimodule converter or the MMC-based DAB structure. Furthermore, the challenges and required features for MV DC-DC converter topologies are discussed.

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Nam, Nguyen Ngoc, and Sung Hyun Kim. "Robust Tracking Control of Dual-Active-Bridge DC–DC Converters with Parameter Uncertainties and Input Saturation." Mathematics 10, no. 24 (December 12, 2022): 4719. http://dx.doi.org/10.3390/math10244719.

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This paper proposes a method for robust tracking control synthesis of dual-active-bridge (DAB) DC–DC converters with parameter uncertainties and input saturation. In the proposed method, the nonlinear function of the phase shift ratio is expressed as a control input, and the phase shift ratio is determined by the one-to-one relationship with the control input. Especially, the proposed method is developed with consideration of the input saturation phenomenon that occurs physically in the phase shift ratio of DAB DC–DC converters. Furthermore, based on the proposed method, a set of exponential constrained stabilization conditions for DAB DC–DC converter systems with parameter uncertainties is provided to ensure a fast convergence rate. Finally, to verify the effectiveness of the proposed control method, various simulation results are provided and compared with the well-known improved model phase shift control (IMPSC) and load current feedforward (LCFF) control methods.

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Tran, Thanh Nhat Trung, Wen-Yan Chang, and Jian-Min Wang. "Dual-Mode Control Scheme to Improve Light Load Efficiency for Dual Active Bridge DC-DC Converters Using Single-Phase-Shift Control." Applied Sciences 12, no. 23 (December 2, 2022): 12356. http://dx.doi.org/10.3390/app122312356.

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Анотація:

In vehicle-to-grid (V2G) applications, dual active bridge (DAB) converters are commonly used as the power interface because they offer high efficiency, galvanic isolation, and bidirectional power flow. For the DAB control strategy, phase-shift control is the mainstream, especially the single-phase-shift (SPS) method because of its ease of implementation. However, due to the phase shift, a DAB converter operated under this control method has relatively high backflow power, resulting in poor efficiency. The SPS control method has the drawback of high backflow power, especially at light loads. Thus, this paper proposes a new dual-mode control scheme to improve the light load efficiency of DAB converters by taking advantage of the pulse-width modulation (PWM) strategy in combination with the conventional SPS strategy for DAB converters based on load conditions. In other words, when the DAB converter operates under light load conditions, the PWM control strategy is used to avoid considerable backflow power. A prototype DAB converter with a power rating of 1 kW under a switching frequency of 100 kHz interfacing a DC bus (400 V) and a battery pack (50 V) is designed and implemented to verify the feasibility of this control strategy. A detailed analysis of the working principle and design parameters of the proposed converter is provided in this paper. Experimental results show that the highest efficiency of the proposed converter at light loads (10–200 W) was 96.2% for the forward power conversion and 97.3% for the backward power conversion.

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Більше джерел

Дисертації з теми "DC-DC converters (LLC and DAB)"

Al, Attar Houssein. "Bidirectional Electric Vehicle Charger Control." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0043.

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Анотація:

Dans cette thèse inscrite dans le cadre de la chaire Renault-Centrale Nantes, l’objectif est de concevoir des stratégies de contrôle pour améliorer les performances et le rendement du chargeur réversible du Véhicule Electrique (VE). Dans le mode décharge, le nouveau défi consiste à concevoir une stratégie de Modulation par Décalage de Phase (MDP) pour améliorer la zone de fonctionnement et le rendement du convertisseur DC-DC. La loi de commande est basée sur l’inversion de gain du convertisseur DC-DC LLC. Du point de vue coût, la contribution porte essentiellement sur la conception d’une stratégie d’optimisation pour diminuer le dimensionnement du convertisseur DC-DC LLC mais aussi d’améliorer les performances de la stratégie de Modulation par Fréquence d’Impulsion (MFI). Ensuite, un développement d’un modèle grand signal du convertisseur LLC basé sur la stratégie MDP est élaboré. La contribution principale consiste à implémenter des stratégies du contrôle robuste, telles que la commande sans modèle et la commande adaptive super twisting, combinées avec la stratégie MDP. D’autre part, l’apport principal conduit à fournir une stratégie de contrôle hybride du chargeur afin de réguler la tension du bus DC dans les zones de saturation du convertisseur DC-DC. Enfin, une nouvelle topologie d’un chargeur VE avec la structure DAB est étudiée. Une stratégie de contrôle en cascade est proposée pour régler le bus DC et le courant réseau. Différentes stratégies de modulation, telles que les modulations par décalage d’un ou de deux déphasages, sont étudiées. Des résultats de simulation de modèles de chargeurs réels sont présentés afin de mettre en évidence l’efficacité des stratégies de contrôle proposées
In this thesis, part of the chair Renault/Centrale Nantes, the aim is to design control strategies to improve the performance and efficiency of the bidirectional charger of the Electric Vehicle (EV). In the discharging mode, the new challenge is to design a Phase Shift Modulation (PSM) strategy to improve the operating zone and efficiency of the DC-DC converter. The control law is based on the DC-DC LLC gaininversion. In terms of cost, the contribution is mainly about the design of an optimization strategy, not only to reduce the sizing of the DC-DC LLC converter, but also to improve the performance of the Pulse Frequency Modulation (PFM) strategy. Then, a large signal model of the LLC converter based on the PSM strategy is developed. The main contribution consists of implementing robust control strategies, such as model-free control and adaptive super twisting control, combined with the PSM strategy. On the other hand, the key contribution leads to provide a hybrid control strategy of the charger in order to be able to regulate the DC bus voltage in the saturation zones of the DC-DCconverter. Finally, a new topology of an EV charger with the DAB structure is studied. A backstepping control strategy is proposed to regulate the DC bus voltage and the grid current. Different modulation strategies, such as single and dual phase shift modulation,are studied. Simulation results of real charger models are presented in order to highlight the effectiveness of the proposed control strategies

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Person, Clark Edwin. "Selection of Primary Side Devices for LLC Resonant Converters." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31746.

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Анотація:

The demand for high power density, high efficiency bus converters has increased interest in resonant topologies, particularly the LLC resonant converter. LLC resonant converters offer several advantages in efficiency, power density, and hold up time extension capability. Among high voltage (>500V) MOSFETs, Super Junction MOSFETs, such as Infineonâ s CoolMOS parts, offer lower Rds on than conventional parts and are a natural choice for this application to improve efficiency. However, there is a history of converter failure due to reverse recovery problems with the primary switchâ s body diode. Before selecting CoolMOS devices for use in a LLC resonant converter, it is necessary to investigate its performance in this application. Field failures of PWM soft switching phase shift full bridge converters have been attributed to large reverse recovery charge in the primary side MOSFET body diode. Under low load conditions the device cannot fully recover, and the large reverse recovery current can cause the device to enter secondary break down, leading to failure. The unique structure of Super Junction MOSFETs, such as CoolMOS, avoid this failure mode by providing a different path for the reverse current; however, the reverse recovery charge of CoolMOS devices is large and can cause a loss of efficiency. For this reason, it is important to avoid conditions under which the reverse recovery characteristics of the body diode can be seen.
Master of Science

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Fei, Chao. "Optimization of LLC Resonant Converters: State-trajectory Control and PCB based Magnetics." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83206.

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With the fast development of information technology (IT) industry, the demand and market volume for off-line power supplies keeps increasing, especially those for desktop, flat-panel TV, telecommunication, computer server and datacenter. An off-line power supply normally consists of electromagnetic interference (EMI) filter, power factor correction (PFC) circuit and isolated DC/DC converter. Isolated DC/DC converter occupies more than half of the volume in an off-line power supply and takes the most control responsibilities, so isolated DC/DC converter is the key aspect to improve the overall performance and reduce the total cost for off-line power supply. On the other hand, of all the power supplies for industrial applications, those for the data center servers are the most performance driven, energy and cost conscious due to the large electricity consumption. The total power consumption of today's data centers is becoming noticeable. Moreover, with the increase in cloud computing and big data, energy use of data centers is expected to continue rapidly increasing in the near future. It is very challenging to design isolated DC/DC converters for datacenters since they are required to provide low-voltage high-current output and fast transient response. The LLC resonant converters have been widely used as the DC-DC converter in off-line power supplies and datacenters due to its high efficiency and hold-up capability. Using LLC converters can minimize switching losses and reduce electromagnetic interference. Almost all the high-end offline power supplies employs LLC converters as the DC/DC converter. But there are three major challenges in LLC converters. Firstly, the control characteristics of the LLC resonant converters are very complex due to the dynamics of the resonant tank. This dissertation proposes to implement a special LLC control method, state-trajectory control, with a low-cost microcontroller (MCU). And further efforts have been made to integrate all the state-trajectory control function into one MCU for high-frequency LLC converters, including start-up and short-circuit protection, fast transient response, light load efficiency improvement and SR driving. Secondly, the transformer in power supplies for IT industry is very bulky and it is very challenging to design. By pushing switching frequency up to MHz with gallium nitride (GaN) devices, the magnetics can be integrated into printed circuit board (PCB) windings. This dissertation proposes a novel matrix transformer structure and its design methodology. On the other hand, shielding technique can be employed to suppress the CM noise for PCB winding transformer. This dissertation proposes a novel shielding technique, which not only suppresses CM noise, but also improves the efficiency. The proposed transformer design and shielding technique is applied to an 800W 400V/12V LLC converter design. Thirdly, the LLC converters have sinusoidal current shape due to the nature of resonance, which has larger root mean square (RMS) of current, as well as larger conduction loss, compared to pulse width modulation (PWM) converter. This dissertation employs three-phase interleaved LLC converters to reduce the circulating energy by inter-connecting the three phases in certain way, and proposed a novel magnetic structure to integrated three inductors and three transformers into one magnetic core. By pushing switching frequency up to 1MHz, all the magnetics can be implemented with 4-layer PCB winding. Additional 2-layer shielding can be integrated to reduce CM noise. The proposed magnetic structure is applied to a 3kW 400V/12V LLC converter. This dissertation solves the challenges in analysis, digital control, magnetic design and EMI in high-frequency DC/DC converters in off-line power supplies. With the academic contribution in this dissertation, GaN devices can be successfully applied to high-frequency DC/DC converters with MHz switching frequency to achieve high efficiency, high power density, simplified but high-performance digital control and automatic manufacturing. The cost will be reduced and the performance will be improved significantly.
Ph. D.

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Bai, Yujie. "Evaluation of the Current-Fed CLLC DC/DC Converters for Battery and Super-Capacitor Based Energy Storage Systems Used in Electrified Transportation." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami157538965174651.

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Kirsten, André Luís. "Metodologia de projeto do conversor dab aplicado a transformadores de estado sólido." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/3685.

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Анотація:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
This thesis presents a design methodology for the dual active bridge converter, that includes the influence of the nominal phase-shift angle in the behavior of the DAB converter for entire power and voltage ranges. The analysis presented focus on two important performance parameters of the DAB converter: the nonactive power and the limits of ZVS operation. The study of these two parameters results in a prior knowledge of the qualitative characteristics of the conduction and switching losses, respectively. Using this knowledge it is possible to optimize the converter operation considering the priorities of application performance. The experimental results were performed for three different projects nominal angles and three different input voltages for the whole load range, and they prove the feasibility of the proposed analysis. The analyse of the limit ZVS area took into account the switches intrinsic capacitances, and the dead time between the complementary switches. The DAB converter placed at a three-stage structure applied to solid state transformer, has voltage ripple at low frequency in their bus voltages because of the connection into the distribution network. Thus, it becomes possible to apply a low frequency burst mode modulation, without needing to oversize the bus capacitors. Three burst mode modulations are evaluated in simulation. The modulation which performed better results in simulation was implemented in practice, and the experimental results showed significant improvement in the converter´s efficiency when it is operating in light loads. Finally, a discussion of the parameters to be evaluated for the DAB converter´s design is proposed.
Esta tese de doutorado apresenta uma metodologia de projeto do conversor DAB, a qual inclui a influência do ângulo nominal de defasagem no comportamento do conversor DAB para toda faixa de potência e de tensão. Além disso, as análises focam em dois importantes parâmetros de desempenho do conversor DAB: a potência não ativa e os limites de operação com ZVS. O estudo destes dois parâmetros resulta em um conhecimento prévio das características qualitativas das perdas de condução e comutação, respectivamente. Através deste conhecimento é possível otimizar a operação do conversor considerando as prioridades de desempenho da aplicação. Os resultados experimentais, que comprovam as análises referentes à potência não ativa e aos limites de operação com ZVS, são realizados para três diferentes projetos de ângulos nominais e três diferentes tensões de entrada, para toda faixa de operação de carga. O estudo dos pontos de perda de ZVS considerou as capacitâncias intrínsecas dos interruptores e o tempo morto entre os interruptores complementares. O conversor DAB funcionando em uma estrutura de três estágios, aplicado a transformadores de estado sólido, apresenta ondulação de tensão em baixa frequência em seus barramentos, provinente da conexão da estrutura na rede de distribuição. Deste modo, torna-se possível a aplicação de modulações de baixa frequência do tipo burst, sem a necessidade de sobredimensionamento dos capacitores. Três modulações são realizadas e avaliadas em simulação. A modulação que apresentou melhores resultados em simulação foi implementada na prática, e os resultados experimentais mostraram melhora significativa da eficiência do conversor em baixas cargas. Por fim, uma discussão sobre as considerações a serem avaliadas nos parâmetros de projeto do conversor DAB é proposta.

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Pittala, Lohith Kumar. "Hardware-in-the-loop implementation of single- and dual-phase shift control for dual active bridge converters in EV applications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24067/.

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Isolated DC-DC converters play a significant role in fast charging and maintaining the variable output voltage for EV applications. This study aims to investigate the different Isolated DC-DC converters for onboard and offboard chargers, then, once the topology is selected, study the control techniques and, finally, achieve a real-time converter model to accomplish Hardware-In-The-Loop (HIL) results. Among the different isolated DC-DC topologies, the Dual Active Bridge (DAB) converter has the advantage of allowing bidirectional power flow, which enables operating in both Grid to Vehicle (G2V) and Vehicle to Grid (V2G) modalities. Recently, DAB has been used in the offboard chargers for high voltage applications due to SiC and GaN MOSFETs; this new technology also allows the utilization of higher switching frequencies. By empowering soft switching techniques to reduce switching losses, higher switching frequency operation is possible in DAB. There are four phase shift control techniques for the DAB converter. They are Single Phase shift, Extended Phase shift, Dual Phase shift, Triple Phase shift controls. This thesis considers two control strategies; Single-Phase, and Dual-Phase shifts, to understand the circulating currents, power losses, and output capacitor size reduction in the DAB. Hardware-In-The-Loop (HIL) experiments are carried out on both controls with high switching frequencies using the PLECS software tool and the RT box supporting the PLECS. Root Mean Square Error is also calculated for steady-state values of output voltage with different sampling frequencies in both the controls to identify the achievable sampling frequency in real-time. DSP implementation is also executed to emulate the optimized DAB converter design, and final real-time simulation results are discussed for both the Single-Phase and Dual-Phase shift controls.

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Silva, João Víctor Nunes da. "Estudo da influência das estratégias de controlo no desempenho de um conversor DC-DC isolado." Master's thesis, 2017. http://hdl.handle.net/10316/83296.

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Анотація:

Dissertação de Mestrado Integrado em Engenharia Electrotécnica e de Computadores apresentada à Faculdade de Ciências e Tecnologia
In recent years electric vehicles have grown tremendously, becoming a viable alternative to the common combustion vehicle due to the low emissions of polluting gases, low noise and the high yield. In order to provide power to the engine, the electric vehicle needs an electrical energy storage system, which is formed of batteries. In the other hand, the batteries need a charging system in order to charge the batteries from an external source, so it is necessary to use the DC-DC converters. DC-DC converters can be divided into isolated and non- isolated, depending on whether electrical isolation between the source and the load is needed, and those can be divided into resonant or non-resonant depending on whether system compensation is required or not. In the scope of this work, an LLC converter was developed to charge the batteries of an electric vehicle, which is a bidirectional isolated resonant DC-DC converter. At the beginning of this work an analysis was made to the literature regarding the dif-ferent DC-DC converters and the different methods used for their control. Then a detailed analysis of a bidirectional LLC converter is shown, as well as an analy-sis of the different control methods that can be used to control this type of converter. Subsequently, the bidirectional LLC converter and the various control methods were simulated in a simulation environment in order to analyze their operation and to be able to com-pare results among the various control methods used. In order to validate the results obtained in simulation, a prototype similar to the one presented in the simulation was also created. Finally, the results obtained in the simulation and in the practical analysis of the project are analyzed and compared in order to be able to conclude the best control method for the reso-nant converter used in this work.
Nos últimos anos os veículos elétricos têm tido um enorme crescimento, tornando-se uma alternativa viável ao comum veículo de combustão, devido as baixas emissões de gases poluentes, ao baixo ruído e ao alto rendimento. De forma a poder fornecer energia ao motor, o veículo elétrico precisa de um sistema de armazenamento de energia elétrica, o qual é constituído a partir de baterias. Por sua vez, as baterias precisam de um sistema de carregamento, de forma a permitir carregar as baterias a partir de uma fonte externa, sendo por isso necessário o uso dos conversores DC-DC. Os conversores DC-DC podem ser divididos em isolados e não isolados, dependendo se se pretende um isolamento elétrico entre a fonte e a carga, e por sua vez estes podem ser divididos em ressonantes ou não ressonantes, dependendo se é necessária compensação do sistema ou não. No âmbito deste trabalho foi desenvolvido um conversor LLC, um conversor DC-DC ressonante isolado bidirecional para carregamento de baterias de um veículo elétrico.No inicio deste trabalho foi feita uma análise à literatura relativa aos diferentes conversores DC-DC existentes e aos diferentes métodos usados para o seu controlo. De seguida é apresentada uma análise detalhada sobre os conversores LLC bidirecionais, assim como uma análise aos diferentes métodos de controlo que podem ser usados para controlar este tipo de conversores.Posteriormente procedeu-se á implementação do conversor LLC bidirecional e dos vários métodos de controlo em ambiente de simulação de forma a analisar e o seu funcionamento e poder comparar resultados entre os vários métodos de controlo usados.De forma a validar os resultados obtidos em simulação, foi também criado um protótipo semelhante ao apresentado na simulação.Por fim são analisados e comparados os resultados obtidos na simulação e na análise prática do projeto para assim ser possível concluir qual o melhor método de controlo para o conversor ressonante usado neste trabalho.

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Costa, Válter de Sousa. "LLC resonant charger with variable inductor control." Master's thesis, 2016. http://hdl.handle.net/10400.26/18421.

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Анотація:

The present work pretends to study the operation and behavior of the LLC resonant converter topology considering a battery charging application, using the traditional switching frequency control and a new control variable, the variable inductance, provided by a current controlled device, the Variable Inductor (VI). During this work, a brief state of the art regarding general types of power converters and resonant power converters is presented. The LLC resonant converter topology and its advantages and disadvantages are described. The VI principle of operation and structure is presented and discussed and, in the end some information about batteries and its behavior under charging and discharging conditions is presented. The considered batteries characteristics for the studied battery charger are shown and the adopted charging profile is presented. In the following chapters, a theoretical analysis of the LLC resonant converter operation and behavior under switching frequency or VI control is performed and presented. A design methodology is proposed for the converter considering both switching frequency and VI control, separately or simultaneously. Simulations of the converter operation under open-loop condition were made, and simulation results were obtained and discussed. A prototype was built and test results were obtained. The prototype uses a SiC MOSFET (Silicon Carbide Metal Oxide-Semiconductor Field Effect Transistor) based inverter working at 100 kHz controlled with fiber optic drivers. To build the prototype, Printed Circuit Boards (PCB) were designed, manufactured and built. An high-frequency transformer and a VI were also design and built. Finally, theoretical, simulation and experimental results are confronted in order to reach conclusions regarding to the proposed design methodology and the prototype operation. This final analysis allows validating the LLC-VI resonant converter as a good option for a battery charger.

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Частини книг з теми "DC-DC converters (LLC and DAB)"

Sha, Deshang, and Guo Xu. "Blocking-Cap-Based DAB Converters." In High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain, 97–114. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0259-6_5.

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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, 47–70. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0259-6_3.

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Guo, Zhiqiang, and Deshang Sha. "Hybrid Phase-Shift-Controlled Three-Level and LLC DC–DC Converter with Active Connection at the Secondary Side." In New Topologies and Modulation Schemes for Soft-Switching Isolated DC–DC Converters, 23–45. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9934-4_2.

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Sha, Deshang, and Guo Xu. "Dual-Transformer-Based DAB Converter with Wide ZVS Range for Wide Voltage Gain Application." In High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain, 71–95. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0259-6_4.

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Тези доповідей конференцій з теми "DC-DC converters (LLC and DAB)"

Jiang You, D. M. Vilathgamuwa, N. Ghasemi, and W. L. Malan. "LLC circuit based ripple current suppression method for single phase bidirectional DC-AC DAB converter." In 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia). IEEE, 2017. http://dx.doi.org/10.1109/ifeec.2017.7992121.

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Li, Mingxue, Xiaoqiang Li, Chengyuan He, and Xiaojie Wu. "An Optimized Design Method of Phase-Shift Angle in DPS Modulation Scheme for LCL-type Resonant DAB DC-DC Converters." In 2019 22nd International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2019. http://dx.doi.org/10.1109/icems.2019.8922494.

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Sijia Geng, Yue Zhao, Shuo Sun, Xingwei Wu, You Zheng, and Jianxing Liu. "Sliding mode control of LLC resonant DC-DC converters." In 2016 IEEE 25th International Symposium on Industrial Electronics (ISIE). IEEE, 2016. http://dx.doi.org/10.1109/isie.2016.7745034.

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Li, Kerui, Cho Kin Yeung, Siew Chong Tan, and Ron Shu Yuen Hui. "Multimode LLC Resonant DC−DC Converters for Wide Range Input Voltage." In 2019 IEEE 4th International Future Energy Electronics Conference (IFEEC). IEEE, 2019. http://dx.doi.org/10.1109/ifeec47410.2019.9015183.

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Higashiya, Ryosuke, and Noriyuki Hori. "Model Orders and Numerical Issues in LLC Resonant DC-DC Converters." In Modelling, Identification and Control. Calgary,AB,Canada: ACTAPRESS, 2017. http://dx.doi.org/10.2316/p.2017.848-017.

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Yoshikawa, Kumpei, and Tetsuya Oshikata. "Planar transformer design of LLC DC-DC converters with electromagnetics simulation." In 2019 IEEE Third International Conference on DC Microgrids (ICDCM). IEEE, 2019. http://dx.doi.org/10.1109/icdcm45535.2019.9232900.

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Jang, Jinhaeng, Minjae Joung, Seokjae Choi, Youngho Choi, and Byungcho Choi. "Current mode control for LLC series resonant dc-to-dc converters." In 2011 IEEE Applied Power Electronics Conference and Exposition - APEC 2011. IEEE, 2011. http://dx.doi.org/10.1109/apec.2011.5744570.

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Jinhaeng Jang, Pidaparthy Syam Kumar, Dongyun Kim, and Byungcho Choi. "Average current-mode control for LLC series resonant dc-to-dc converters." In 2012 7th International Power Electronics and Motion Control Conference (IPEMC 2012). IEEE, 2012. http://dx.doi.org/10.1109/ipemc.2012.6258918.

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Han, Yue, Jinxu Yang, and Xinke Wu. "Suppressing Methods of Common-Mode Noise in LLC Resonant DC-DC Converters." In 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2019. http://dx.doi.org/10.1109/apec.2019.8722131.

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de Juan, Aurora, Diego Serrano, Pedro Alou, Jean-Noel Mamousse, Romain Deneieport, and Miroslav Vasic. "Analytical Modelling of Single-Phase and Three-Phase DC/DC LLC Converters." In 2022 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2022. http://dx.doi.org/10.1109/apec43599.2022.9773467.

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