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Dissertations / Theses on the topic 'LLC resonant converters'

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Published: 4 June 2021
Last updated: 6 February 2022

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1

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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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 diod
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2

Feng, Weiyi. "State-Trajectory Analysis and Control of LLC Resonant Converters." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19327.

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With the fast development of communication systems, computers and consumer electronics, the power supplies for telecoms, servers, desktops, laptops, flat-panel TVs, LED lighting, etc. are required for more power delivery with smaller spaces. The LLC resonant converter has been widely adopted for these applications due to the advantages in high efficiency, high power density and holdup time operation capability.<br />However, unlike PWM converters, the control of the LLC resonant converter is much more difficult because of the fast dynamic characteristic of the resonant tank. In some highly dyn
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3

Yu, Ruiyang, and 余睿阳. "Design optimization of off-line power converters: from PWM to LLC resonant converteres." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49799642.

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High power conversion efficiency is desirable in power supplies. Design optimization of on-line power converter is presented in this thesis. High efficiencies over a wide load range, for example 20%, 50% and 100% load, are often required. It is a challenge for on-line pulse-width modulation (PWM) converters to maintain good efficiencies with light load as well as full load. A two-stage multi-objective optimization procedure is proposed to optimization power converter efficiencies at 20%, 50% and 100% load. Two-FET forward prototype converters are built to verify the optimization results. Th
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4

Ho, Kwun-yuan Godwin, and 賀觀元. "A novel integrated synchronous rectifier for LLC resonant converter." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49618180.

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There is ever-increasing demand in telecommunication system, data server and computer equipment for low voltage, high current power supply. LLC resonant converter is a good topology on primary side of the converter because it has soft switching and resonant conversion. However, the passive rectifier in the secondary side has high power dissipation. Synchronous rectifier is a popular method to reduce this rectification loss. Although there are many types of synchronous rectifier for PWM converter, most of them do not function well in LLC resonant converters. It is because the wave form of LLC
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5

Huang, Daocheng. "Investigation of Topology and Integration for Multi-Element Resonant Converters." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/24909.

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With the fast development of communication systems, computers and consumer electronics, the power supplies for telecoms, servers, desktops, laptops, flat-panel TVs, LED lighting, etc. are required for more efficient power delivery with smaller spaces. The LLC resonant converter has been widely adopted for these applications due to the advantages in high efficiency, high power density and holdup time operation capability. However, LLC resonant converter meets some issues, especially in high output current applications. Those issues include magnetic design, start-up, short-circuit protection, s
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6

Hsieh, Yi-Hsun. "Accurate Small-Signal Modeling for Resonant Converters." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/100941.

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In comparison with PWM converters, resonant converters are gaining increasing popularity for cases in which efficiency and power density are at a premium. However, the lack of an accurate small-signal model has become an impediment to performance optimization. Many modeling attempts have been made to date. Besides the discrete time-domain modeling, most continuous-time modeling approaches are based on fundamental approximation, and are thus unable to provide sufficient accuracy for practical use. An equivalent circuit model was proposed by Yang, which works well for series resonant converters
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7

Tian, Shuilin. "Equivalent Circuit Model of High Frequency PWM and Resonant Converters." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56676.

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Distributed power system (DPS) is widely adopted in Power supplies for the telecom, computer and network applications. Constant on-time current mode control and V2 control are widely used as point-of-load (POL) converters and voltage regulators (VR) in DPS systems. Series resonant converters (SRC) are widely used in aerospace systems and LLC resonant converters are widely used as Front-end converters in DPS systems. The technological innovations bring increasing demand for optimizing the dynamic performance of the switching regulators in these applications. There has been a strong desire to de
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8

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
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9

Fei, Chao. "Microcontroller (MCU) Based Simplified Optimal Trajectory Control (SOTC) for High-Frequency LLC Resonant Converters." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/78117.

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The LLC resonant converter has been widely used as a DC-DC converter due to its high efficiency, high power density and hold-up capability in power supplies for communication systems, computers and consumer electronics. Use of the high-frequency LLC converter has also been increasing in recent years due to its high power density and integrated magnetics, which reduce the total cost. With the fast development of wideband gap devices and novel magnetic materials, the trend of pushing switching frequency higher continues. However, the control characteristics of the LLC resonant converter are much
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10

Kollipara, Nagasri. "Control and Optimization of Power in LLC Converter Using Phase Control." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1535402155288153.

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11

Sun, Bingyao. "High-Frequency Oriented Design of Gallium-Nitride (GaN) Based High Power Density Converters." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/85054.

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The wide-bandgap (WBG) devices, like gallium nitride (GaN) and silicon carbide (SiC) devices have proven to be a driving force of the development of the power conversion technology. Thanks to their distinct advantages over silicon (Si) devices including the faster switching speed and lower switching losses, WBG-based power converter can adopt a higher switching frequency and pursue higher power density and higher efficiency. As a trade-off of the advantages, there also exist the high-frequency-oriented challenges in the adoption of the GaN HEMT under research, including narrow safe gate opera
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12

Panov, Vasil. "LLC resonant converter modelling." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46521.

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Many of today's power converters use pulse-width modulation(PWM) techniques to regulate the circulating currents and voltages. A significant problem with most dc-dc converters is the increased power loss during switching. These devices typically operate in hard-switching mode which results in switching losses. Resonant converters have been used to minimize or even eliminate this problem. Although LLC resonant converters have shown significant gains in terms of efficiency, their modeling is still a challenge. LLC converters are designed to function in a specific mode and region of operation.
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13

Chen, Haoning (William). "LLC Resonant Current Doubler Converter." Thesis, University of Canterbury. Electrical and Computer Engineering, 2013. http://hdl.handle.net/10092/8492.

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The telecommunications market is one of the large rapidly growing fields in today’s power supply industry due to the increasing demand for telecom distributed power supply (DPS) systems. The half-bridge LLC (Inductor-Inductor-Capacitor) resonant converter is currently the most attractive topology for the design and implementation of 24V/48V DC telecom power converters. The current doubler rectifier (CDR) converter topology was invented and described in the early 1950s which can offer the unique characteristic of halving the output voltage while doubling the output current compared to a standar
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14

Cheng, Brian Cheak Shing. "Modelling and control of the LLC resonant converter." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43729.

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To achieve certain objectives and specifications such as output voltage regulation, any power electronics converter must be coupled with a feedback control system. Therefore, a topic of considerable interest is the design and implementation of control systems for the LLC resonant converter. Additionally, with the current trend of smaller, more cost effective and reliable digital signal processors, the implementation of digital feedback control systems has garnered plenty of interest from academia as well as industry. Therefore, the scope of this thesis is to develop a digital control algorith
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15

Drda, Václav. "Vícefázový serio-paralelní LLC rezonanční měnič." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218812.

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The project deals with the design of a switch-mode power supply (SMPS) with a medium and high power output. The power supply uses multiphase control switching. Electric energy is converted through a series parallel LLC resonant circuit to reach the maximum efficiency with a small size and cost efficiency of the designed power supply. The semiconductor switches use ZVS (Zero Voltage Switching) on the primary side and ZCS (Zero Current Switching) on the secondary side of the converter. The design of the converter is based on the knowledge of the high power output converters (types of switching,
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16

Amiri, Peyman. "Synchronous rectification for LLC resonant converter in battery charging application." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63050.

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Everyday the number of devices with a battery inside is increasing. From smartphones to electric vehicles, batteries are widely used in different power ratings. Charging time is one of the major obstacles in widespread use of battery powered electric vehicles. Developing high power chargers is one of the key steps to achieve fast charging. Developing high power chargers requires design of compact and high efficiency converters. LLC Resonant converter is widely used in the structure of medium to high power chargers. Utilizing synchronous rectification technique, along with the converter intrin
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17

Petrásek, Radek. "LLC rezonanční měnič středního výkonu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217672.

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The aim of this diploma thesis is to study the resonant converters operation. This paper is concretely specialized to design and implementation the LLC resonant converter with output power about 350 watts. LLC resonant converter is prospective solution for similar applications. The general advantages are that the power MOSFETs are working on zero voltage switching condition, which reduce the switching loss and improve EMI performance. The detailed design for the LLC resonant tank characteristics presented in this paper, which fully guarantees the ZVS condition. This study is based on replacing
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18

Liu, Ya. "High Efficiency Optimization of LLC Resonant Converter for Wide Load Range." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/30990.

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As information technology advances, so does the demand for power management of telecom and computing equipment. High efficiency and high power density are still the key technology drivers for power management for these applications. In order to save energy, in 2005, the U.S. Environmental Protection Agency (EPA) announced the first draft of its proposed revision to its ENERGY STAR specification for computers. The draft specification separately addresses efficiency requirements for laptop, desktop, workstation and server computers. The draft specification also proposes a minimum power supply ef
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19

Ang, Yong-Ann. "Modelling, analysis and design of LCLC resonant power converters." Thesis, University of Sheffield, 2006. http://etheses.whiterose.ac.uk/15027/.

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The thesis investigates the modelling, analysis, design and control of 4th -order LCLC resonant power converters. Both voltage-output and current-output variants, are considered. Key research outcomes are the derivation of new frequency- and time-domain models of the converters, based on normalised component ratios, and including the effects that parasitic elements have on circuit behaviour, and a detailed account of multi-resonant characteristics; extensions to the use of cyclicmode modelling methods for application to LCLC converters, to provide rapid steady-state analysis, thereby facilitat
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20

Gilbert, Adam John. "Analysis, design and control of LCC resonant power converters." Thesis, University of Sheffield, 2007. http://etheses.whiterose.ac.uk/15028/.

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Through the judicious and efficient use of energy in both domestic and commercial products, the rate at which the world's fossil fuels and mineral resources are depleted, can be minimised, thereby securing energy reserves for the future. This thesis considers a number energy saving roles the power systems engineer can contribute, with specific emphasis on the impact of improving DC-DC power converters for providing significant energy savings. It is shown that by increasing the efficiency of such converters, through the greater use of switched-mode supplies, huge reductions in the production of
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21

Hsu, Chi-Lun, and 許繼倫. "Efficiency Analysis of LLC Resonant Converters." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/50065916316761517229.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>104<br>Abstract This thesis proposes a study of efficiency analysis for LLC resonant converters. Since LLC resonant converters possess characteristics of soft-switching, high efficiency and low electromagnetic interference, are suitable to be used for power conversions. In general, efficiency is an important parameter to impact the performances of LLC resonant converters. However, only a few researches were presented for the efficiency analysis of LLC resonant converters in detail. Therefore, the efficiency of LLC resonant converters is necessary to study due to it
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22

Yen-ChihWang and 王彥智. "Small-Signal Analysis of LLC Resonant Converters." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/05907993223223430340.

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碩士<br>國立成功大學<br>電機工程學系專班<br>99<br>This thesis presents the small-signal analysis of the full-bridge LLC resonant converter with the variable-frequency control. In order to determine the frequency characteristics of the full-bridge LLC resonant converter, the control-to-output transfer function and corresponding poles and zeros need to be derived. Therefore, a novel small-signal analysis using the concept of frequency modulation (FM) and frequency demodulation (FDM) is proposed. The variable-frequency control scheme can be treated as a frequency modulator because the small-signal perturbation c
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23

Huang, Shiang-Kai, and 黃詳凱. "Interleaved LLC Resonant Converters with Digital Control." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/75825081309366798931.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>102<br>The LLC resonant converter has several characteristics and it has been widely used in DC/DC power application. However, it has large current ripple on secondary side due to lacking output inductor. Several aluminum electrolytic capacitors have to be used in parallel to meet the ripple current specification and reduce output voltage ripple. Consequently, the power density of the converter is decreased. The interleaved LLC converter is suitable for the high output current application since interleaved configuration has several features such as less stress on com
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Wang, Wei-Kai, and 王威愷. "LLC Resonant Converters with Current Ripple Reduction." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69548973928814800057.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>101<br>Two LLC converters LLC with Taiwan Tech center-tapped rectifier (LLC-TCT) and current ripple reduction LLC-TCT are proposed in the thesis. In addition to having zero-voltage switching operation on the MOSFETs and zero-current switching on the rectifier diodes inherited from their predecessors, both converters have several additional features. For instance, the rectifier diodes are clamped to the output voltage due to the absence of filter inductor, the utilization of the clamping series-diode technique, and the recovery of the transformer secondary leakage ene
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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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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
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Wang, Chao-Chun, and 王超駿. "Optimization Design of LLC Half-Bridge series-Resonant Converters." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/14838067190596831519.

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碩士<br>中原大學<br>電機工程研究所<br>96<br>This thesis primarily aims to achieve the most highly optimal design for LLC-SRC in terms of safety, stability and reliability. The main circuitry used is LLC-SRC as it is able to achieve high efficiency, low level of EMI emissions, and high power density. Investigation of LLC-SRC design was conducted by using the L6599 PWM IC of STMicroelectronics. The optimization design of LLC-SRC was achieved to implement a 90W PSU. It is able to achieve high efficiency and meet EPA regulation. The electrical functions compares with experimental results and a laboratory proto
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27

Liang, Cherng-huei, and 梁成輝. "Design and Implementation of Interleaved LLC Half-bridge Resonant Converters." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/47910954625498361254.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>96<br>In this thesis, interleaved LLC half-bridge resonant converters are designed and implemented. In order to increase output power, two LLC resonant converters are parallel-connected. Two gate driver signals of switches are interleaved by 90 degrees to reduce output-current ripple. Besides, switch losses on power devices can be reduced by zero voltage switching(ZVS) and output diode with zero current switching(ZCS). The characteristics of the proposed topology are discussed, and the operation principles and design process are also addressed in this thesis. Fina
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Wu, Bing-Yue, and 吳秉岳. "Simulation and Analysis of Interleaved LLC Resonant Converters with Parameter Errors." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/q2v46p.

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碩士<br>健行科技大學<br>電機工程系碩士班<br>106<br>This paper investigates the influence of module current imbalance due to parameter errors in an interleaved LLC resonant power converter. First the current imbalance theory is explained. Next the operation of an interleaved LLC resonant power converter is analyzed and simulated. Finally, the impact to the power converter performance by current imbalance is examined. The parameter errors including transformer turns ratio n, resonant inductance Lr, resonant capacitance Cr, and magnetized inductance Lm, are considered. Results obtained from this research can be
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Lin, Song-Po, and 林松柏. "Comparison and Analysis of Voltage Feedback Control in LLC Series Resonant Converters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jt8rm8.

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碩士<br>健行科技大學<br>電機工程系碩士班<br>106<br>The LLC resonant power converter has been found increasing applications in the field of power supplies. It features high efficiency, low EMI, zero voltage switching and zero current switching. The switching losses are much less than that of the PWM converters. Besides, the resonant inductor can be designed to integrate into the transformer. To cope with the demands of smaller size and reduced cost for commercial products, this paper proposes a new PSR (Primary Side Regualtion) method to replace the SSR(Secondary Side Regulation) for LLC resonant converter out
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Lin, Meng-Fan, and 林孟帆. "Optimization Design of Planar Transformer for High Frequency LLC Series Resonant Converters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u9m6cr.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>106<br>Magnetic components are the main source of power losses in high step-down LLC resonant converters. Therefore, to achieve high efficiency and high power density, improving the magnetic element is an important issue. Ferrite cores with high permeability and low core loss are widely used in high-frequency switching power supplies. The core loss mainly results from hysteresis loss and eddy current loss. Therefore, this thesis aims to analyze and optimize the structure of ferrite cores using Maxwell software to implement the Finite Element Method (FEM). Changing th
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31

Lyu, Zong-Han, and 呂宗翰. "A Light-Load Efficiency Improvement Technique for Full-Bridge LLC Resonant Converters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5jm447.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>106<br>Comparing with conventional resonant converters, the LLC resonant converter boasts benefits including regulates the output voltage with a relatively small variation of switching frequency, achieves zero voltage switching (ZVS) over wide operating range and utilizes all essential parasitic elements for achieving ZVS. In this thesis, a hybrid control strategy of full bridge LLC resonant converter is proposed. Using this control strategy, full bridge LLC resonant converter operates in variable frequency modulation under normal to heavy load and in phase shift mod
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32

Liu, Kai-Ping, and 劉開平. "Design and Implementation of LLC Resonant Converters to Improve Standby Power Efficiency." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/44556877509224567744.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>102<br>This thesis presents a novel solution of improving standby efficiency applied to half-bridge high power LLC resonant converter which can be used in the renewable generation systems of the distributed power systems. The main goal is that solar and wind power can be produced in both high-efficiency and stable output to supply loads in various conditions of loads. In order to achieve the above objectives, this thesis will further study the series and parallel resonant power converters and propose light load control strategies. Series and parallel resonant power c
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Lin, Guan-Wei, and 林官緯. "Optimization Design of Fraction-Turns Transformer for High Frequency LLC Series Resonant Converters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5mx2p7.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>106<br>For the high step-down LLC resonant converters with low voltage and high power output, main sources of power losses are copperloss of secondary side and coreloss, also the volume of magnetic component decided total capacity of circuits. Therefore, to achieve high efficiency and high power density, improving the magnetic element is an important issue. The fraction-turns transformer structure can reduce copper length of secondary side, through which can reduce the copper loss of transformer. Therefore, this thesis aims to analyze the availability of fraction-tur
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Huang, Zhèng-èr, and 黃正二. "Current Balancing Control of Interleaved LLC Resonant Converters by Pulse-Width Modulation Method." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60192251864568185150.

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碩士<br>健行科技大學<br>電機工程系碩士班<br>103<br>This thesis proposes to use pulse-width modulation (PWM), instead of frequency modulation (FM), to regulate the output voltage and balance the module currents of an interleaved LLC resonant converter. The imbalance of module currents in power converters with modules connected in parallel is usually a problem caused by parameter errors of component, which is unavoidable and unsolvable by the regular FM method. The thesis combines the Fundamental component approximation method and the Fourier series analysis technique to explain the principle that a half bridge
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Wang, Chao-Chun, and 王超駿. "Optimization Design of Synchronous Rectification for High-efficiency LLC Half-bridge Resonant Converters." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/25272233767132704030.

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博士<br>國立臺灣科技大學<br>電子工程系<br>103<br>This dissertation mainly aims to study the optimal design for half-bridge LLC resonant converter with synchronous rectifier. In order to further improve the efficiency and reliability, zero-voltage switching, compensated sensing of synchronous rectifier technologies and integrated drivers are adopted. Operating principles and design considerations are analyzed and discussed in detail. The experimental results of a 12V/ 200W laboratory prototype are shown to verify the feasibility of the proposed scheme. The highest efficiency is achieved to 97.6% at 100% load.
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Chen, Shih-Yuan, and 陳世源. "The Control of Synchronous Rectification Scheme and the Tracking of Resonant Frequency Technique in Digital LLC Resonant Converters." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/53s6b9.

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碩士<br>國立臺北科技大學<br>電機工程研究所<br>103<br>This thesis focuses on digital and implementation of digital LLC resonant server power supply. We use the control method built in the digital signal processor to let Synchronous Rectification switches reach near zero current switching, and propose a new resonant frequency tracking technique which makes light-to-heavy load switching frequency operate in resonant frequency so that the server power will enhance the overall efficiency. First, with near-synchronous characteristic of LLC primary and secondary-side switches Vds, we used digital signal processor to
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Chen, Shih-Shian, and 陳仕賢. "Using Variable Resonant Inductor to Realize Conversion Efficiency Improvement and Abnormal Input Voltage Operation for Half-bridge LLC Series Resonant Converters." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ayhvmq.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>107<br>Under the fixed transformer magnetizing inductance, the conversion efficiency of an LLC series resonant converter will be affected by the inductances of resonant inductor in the resonant tank corresponding to different resonant frequencies, resonant inductor ratios, and frequency response gains. Therefore, it will be helpful to improve the conversion efficiency of an LLC series resonant converter if a variable resonant inductor can be designed and the relationship corresponding to the switching frequency, resonant inductor and conduction loss can be analyzed
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Yung-Chyang-Wang and 王永強. "LLC Resonant Half Bridge Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65223932741609639976.

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Chen, Song-Cian, and 陳頌謙. "Near Constant-Frequency LLC Resonant Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/80169305727621846036.

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碩士<br>建國科技大學<br>電機工程系暨研究所<br>99<br>This study proposed a new LLC resonant converter with near constant-frequency. With the characteristic of soft switching, LLC resonant converters presents the advantages of high conversion efficiency and low electromagnetic interference (EMI) that they are suitable for high-frequency power converters. Nonetheless, LLC resonant converters are operated with variable-frequency control that the designs of EMI filters become more complicated and difficult. Besides, when working in light load, the efficiency conversion is lower and the output voltage ripples are la
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Chun-HsuYang and 楊淳旭. "IC Design for LLC Resonant Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/41940660259405825488.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>101<br>In this thesis, a controller for a half-bridge LLC resonant DC-DC converter with light-load efficiency improvement is realized. The high switching frequency and circulating current in the resonant tank result the poor efficiency of a LLC resonant converter under light load condition. The light-load efficiency improvement is limited with the conventional burst-mode control. To improve efficiency further, a modified burst-mode control is implemented in the proposed controller. The switching frequency decreases gradually during burst-on time to reduce the numb
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HUANG, NIAN-ZHONG, and 黃念中. "Research of LLC Resonant DC Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/n59wwt.

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碩士<br>中華科技大學<br>機電光工程研究所碩士班<br>106<br>This thesis mainly discusses the LLC resonant power converter. We uses the characteristics of the resonant converter's soft switching and analyzes the operation principle of the LLC resonant converter. The advantages of the LLC resonant converter are as follows: The switch has Zero voltage switching, secondary side rectification with zero current. The LLC resonant converter has the advantage of a fixed duty cycle. It uses primary transformer primary leakage inductance, magnetizing inductance, parasitic elements of the MOSFET, and resonant capacitors to gen
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Chen, Peng-Ruei, and 陳芃瑞. "Implementation of the LLC Resonant Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02429844998477385969.

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碩士<br>崑山科技大學<br>電機工程研究所<br>104<br>This thesis presents an isolated half-bridge converter for high efficiency battery charger. The power stage uses a resonant LLC topology since it improves efficiency, reduces EMI signature and provides better transformer utilization compared to conventional topologies. In the resonant tank, only one magnetic component is needed, the leakage inductance of transformer is used as resonant inductance. With proper selection of the resonant tank and modulation of the operation switching frequency, the power switches of proposed circuit can achieve zero voltag
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Chan, Chih-Hao, and 詹智皓. "Implementation and Study of LLC Resonant Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/50964565994434461961.

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碩士<br>建國科技大學<br>電機工程系暨研究所<br>97<br>This thesis conducts Genetic Algorithm and Taguchi method to determine the component values of the resonant circuit. Since LLC resonant converter possesses soft-switching characteristic and has high transfer efficiency and low electromagnetic interference, it is suitable to be used in switching power supplies. Nevertheless, the high output current ripple requiring a larger capacitor is a major drawback that limits the applications of LLC resonant converter. Even though current-shaping technologies have been proposed for overcoming the above-mentioned defect,
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Yang, Chih-Lung, and 楊志隆. "Analysis and Implementation of LLC Resonant Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/75066414087761942462.

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碩士<br>雲林科技大學<br>電機工程系碩士班<br>96<br>Analysis and implementation of an LLC resonant converter with multiple outputs are presented in this thesis. The advantages of resonant converter are high efficiency, high switching frequency and high power density. The LLC converter are suitable for TFT-LCD power supply module. The proposed LLC resonant converter can supply 12V and 24V output voltages at the same time. The front stage of proposed converter is a boost converter with high power factor. The flyback converter is also designed to provide the standby power for the full circuit. The experimental res
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Chen, Ya-chun, and 陳雅君. "Design and Implementation of LLC Resonant Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/39933214325948361006.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>97<br>In this thesis, an LLC resonant converter is designed and implemented. The power losses of power devices and transformer are analyzed at different load conditions. Especially, the performance of LLC resonant converter operated with various burst-mode frequency and high-switching frequency are discussed and compared under light load conditions. Finally, a laboratory prototype LLC resonant converter with input 400V and output 24V/10A is implemented to verify the analysis and discussion.
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Chu, Yu-Hsien, and 朱育賢. "High-Efficiency Design of LLC Resonant Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23657062494546645211.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>96<br>The LLC resonant converter has the merit of fixed duty cycle operation. A combination of parasitic components, which includes the MOSFET output capacitance and the leakage inductance of the isolation transformer, produces a resonant action and reduces drain-source voltage prior to turn-on. Moreover, the switching loss is reduced relatively.Therefore, high efficiency operation of system is achieved.An experimental prototype of 115~264Vac input, 19V/4.73A output, the resonant converter full load efficient reaches 95.31%. The subject of this thesis is to analyze
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Chen, Jyue-Long, and 陳珏龍. "Design and Implementation of Resonant Capacitor Controlled LLC Resonant Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/uaae3v.

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碩士<br>國立中央大學<br>電機工程學系<br>106<br>This thesis focuses on the design and implementation of a half-bridge LLC resonant converter with power factor correction. The traditional LLC resonant converter suffer from the problem of poor light-load efficiency. Burst-mode is usually used to solve this problem, but Burst-mode has problems like large output voltage ripple, acoustic noise, poor dynamic response. This thesis proposes a resonant capacitor controlled LLC resonant converter to improve light-load efficiency. In addition, this control method can be used to extend hold-up time. Finally, this thesis
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Lin, Jin-Bin, and 林晉賓. "Implementing 300W LLC Resonant Converter Based on DSP." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/16974892168657392082.

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碩士<br>國立交通大學<br>機械工程學系<br>101<br>In recent years, many electronic products development towards miniaturization, it’s necessary to increase switching frequency, so that the magnetic element in the DC-DC converter becomes smaller. How to reduce the switching loss and keep high efficiency, it will become an important issue. In this thesis investigates the LLC half-bridge resonant circuit with synchronous rectification, when the switch turns on can achieve zero voltage switching or zero current switching, and decreases the switching loss. The system based on TMSF28027 DSP chip, and use digital PID
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Su, Hsuan-Ching, and 蘇玄靖. "Study and Implementation of 350W LLC resonant converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/zts6t6.

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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>This thesis studies an 80Plus-certified power converter to improve circuit efficiency by using zero voltage switching technology. Among lots of power conversion technologies, LLC resonant converter has many advantages such as low switching loss and high efficiency. The resonant tank is used in the LLC resonant converter. Since the input impedance of resonant tank is operated at inductive load, the input fundament current is lagging to the fundamental voltage. Therefore, power switches can be turned on at zero voltage switching over wide range of input voltage
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Ping-Sheng, Chen, and 陳平昇. "Interleaved Three-Level Fixed-Frequency LLC Resonant Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/09605790964952761940.

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碩士<br>健行科技大學<br>電機工程系碩士班<br>102<br>This thesis proposes to utilize the fixed-frequency PWM control strategy to replace the traditional phase-shift modulation for realization of a high-efficiency interleaved three-level LLC resonant converter. Result obtained from this research is suitable for application in areas where high voltage, high power, and high stability DC-DC conversion is required. The proposed converter consists of two modules of three-level LLC resonant converter, in which the switching frequency is kept fixed and phase angle between modules is 90° shifted. Major advantages of suc
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