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High Power LLC Resonant Converter Optimized for High Efficiency and Industrial Use

2016
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Release : 2016
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Book Synopsis High Power LLC Resonant Converter Optimized for High Efficiency and Industrial Use by : Heiko Figge

Download or read book High Power LLC Resonant Converter Optimized for High Efficiency and Industrial Use written by Heiko Figge. This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: In order to feed IT infrastructure out of the national power grids, the electricity needs to be converted by power supplies. The LLC resonant converter analyzed in this thesis potentially enables a distinct reduction of invest and operational costs based on its superior power density and conversion efficiency. The main obstacles for the adoption of the LLC resonant converter within industrial power supplies are the more disadvantageous control of the power transfer compared to its pulse-width controlled counterparts and the more complex design. This thesis outlines the modeling methods for resonant converters and proposes the extension of the time domain analysis model by a lumped resistive circuit element. The dynamic modeling of the LLC resonant converter is performed utilizing the extended describing functions method, thereby discussing the large variations of the plant characteristic in the dependence on the control variable switching frequency. In addition the problematic short-circuit behavior of the LLC resonant converter is analyzed and a circuit extension proposed. Furthermore this thesis states fundamental design trade-offs within the LLC converter design for industrial power supplies and proposes the usage of numerical optimization with respect to an optimal converter design. Based on the substantial loss contributors, the numerical optimization yields a peak efficiency of 99.2%. As a further aspect the synchronized paralleling of two LLC resonant converters is especially beneficial in case of low output voltages and resulting high output currents. The problematic issue of power imbalance between both converters caused by slightly unequal resonant circuit element values is analyzed in this thesis utilizing the time domain modeling approach. ; eng

LLC Resonant Converters

2022-11-10
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Release : 2022-11-10
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Book Rating : 668/5 ( reviews)

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Book Synopsis LLC Resonant Converters by : Claudio Adragna

Download or read book LLC Resonant Converters written by Claudio Adragna. This book was released on 2022-11-10. Available in PDF, EPUB and Kindle. Book excerpt: A resonant converter is a type of electric power converter that contains a network of inductors and capacitors called a "resonant tank", tuned to resonate at a specific frequency. They find applications in electronics and integrated circuits. The LLC resonant converter is perhaps today's most popular resonant conversion topology. Though in existence for many years, only relatively recently has the LLC resonant converter gained in popularity. Since its first appearance in the literature in 1988, for a long time it was confined to niche applications such as high-voltage power supplies or high-end audio systems. Its significant industrial usage started in mid 2000s with the boom of flat screen TVs, whose power supply requirements found in the LLC resonant converter their best answer, and was fueled by the introduction of new regulations, both voluntary and mandatory, concerning an efficient use of energy. This combination of events pushed power designers to find more and more efficient AC-DC conversion systems. Since then, several other mass-produced electronic devices, such as All-In-One and small form factor PCs, high-power AC-DC adapters and LED drivers, have made a massive usage of this topology, especially in its half-bridge version. Higher power systems, such as server and telecom power supplies and, more recently, charging stations for electric vehicles, have adopted mainly the full-bridge version. Much progress has been made on both the theoretical and practical aspects related to the LLC resonant converter. Numerous publications and application notes deal with it, and many IC manufacturers have dedicated driver ICs in their portfolio. Despite that, its design is still considered a challenging task in Power Conversion. Thus, a guided tour through its intricacies may be beneficial to both the neophyte and the experienced engineer, as well as students active in this field. This monograph covers the basics (operating modes, soft switching mechanism, first-harmonic approximation, etc.) and advanced topics (design optimization, control methods, synchronous rectification, interleaving, etc.) of power conversion using the LLC resonant converter, using a hands-on, design-oriented approach.

Control and Optimization of Power in LLC Converter Using Phase Control

2018 Electric network topology
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Release : 2018
Genre : Electric network topology
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Book Synopsis Control and Optimization of Power in LLC Converter Using Phase Control by : Nagasri Kollipara

Download or read book Control and Optimization of Power in LLC Converter Using Phase Control written by Nagasri Kollipara. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: LLC resonant converters are popular among resonant topologies due to their high efficiency and ability to achieve ZVS and ZCS for wide input range. LLC resonant converters are controlled by frequency modulation (FM), which makes converter difficult to optimize the system in terms of achieving efficient power conversion. FM technique also generate wide range of harmonics which leads to a wide sweep in operating frequency, which can run into regulatory EMI test limits and cause electromagnetic compatibility issues. The performance of LLC topology extends to their poor efficiency at lighter loads, due to constant high magnetization current. In order to increase maximum power efficiency conversion, there is a necessity maintaining fixed frequency which indeed generates high EMI issues at heavy loads. These limitations can be dramatically improved by Phase Shift Modulation (PSM) technique which is investigated in this thesis. PSM controlled technique is expected to not only improve the power supply efficiency at lighter loads. In this thesis, characteristics of LLC converter using phase control is analyzed systematically and compared with conventional frequency modulation technique. Using SIMPLIS simulations, PSM and FM techniques are compared and efficiencies are recorded. At higher loads, both FM and PSM controlled techniques exhibit maximum efficiency of 94.86%. The maximum efficiency of PSM LLC converter is observed at 97.47%. At lighter load conditions, efficiency of PSM LLC converter is observed as 91.66% and FM LLC converter as 82.8%. From simulation results, PSM technique has more controlled resonant tank currents with controlled conduction losses than conventional FM driven converter.

Design Optimization of Off-Line Power Converters

2017-01-26
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Release : 2017-01-26
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Book Rating : 677/5 ( reviews)

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Book Synopsis Design Optimization of Off-Line Power Converters by : Ruiyang Yu

Download or read book Design Optimization of Off-Line Power Converters written by Ruiyang Yu. This book was released on 2017-01-26. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Design Optimization of Off-line Power Converters: From PWM to LLC Resonant Converteres" by Ruiyang, Yu, 余睿阳, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: 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. The LLC (abbreviation of two resonant inductor L and one resonant capacitor C ) series resonant converter can provide high power conversion efficiency because of the resonant nature and soft switching. The design of LLC resonant converter is more difficult than that of PWM converters since the LLC resonant converter has many resonant modes. Furthermore, the LLC resonant converter does not have analytical solution for its resonant operation. In this thesis, a systematic optimization procedure is proposed to optimize LLC series resonant converter efficiency. A mode solver technique is developed to solve LLC resonant converter operations. The proposed mode solver employs non-linear programming techniques to solve a set of LLC state equations and determine the resonant modes. Loss models are provided which serve as the objective-function to optimize converter efficiency. Optimization results show outstanding efficiency performance and experimental agreement with optimization. The optimization work extends to the LLC resonant converter with power factor correction (PFC) circuits where the effect of LLC converter input voltage variation cased by the PFC circuit is considered. Detail comparisons of PWM converter and LLC resonant converter loss profiles are also presented. The reasons that LLC resonant converter has higher efficiency are given and supported by quantitative data. Converter lifetime is highly related to component losses and temperature. The lifetime analysis is presented. The analysis reveals that the LLC resonant converter output capacitor is the weakest component concerning life. DOI: 10.5353/th_b4979964 Subjects: Electric current converters Pulse-duration modulation Electric resonators

Advances in High-Efficiency LLC Resonant Converters

2020-10-02 Technology & Engineering
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Release : 2020-10-02
Genre : Technology & Engineering
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Book Rating : 866/5 ( reviews)

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Book Synopsis Advances in High-Efficiency LLC Resonant Converters by :

Download or read book Advances in High-Efficiency LLC Resonant Converters written by . This book was released on 2020-10-02. Available in PDF, EPUB and Kindle. Book excerpt:

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