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Author :
Release : 2020-10-02
Genre : Technology & Engineering
Kind : eBook
Book Rating : 866/5 ( reviews)
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:
Author : Heiko Figge
Release : 2016
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
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
Author : Claudio Adragna
Release : 2022-11-10
Genre :
Kind : eBook
Book Rating : 668/5 ( reviews)
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.
Author : Marian K. Kazimierczuk
Release : 2012-11-07
Genre : Religion
Kind : eBook
Book Rating : 860/5 ( reviews)
Book Synopsis Resonant Power Converters by : Marian K. Kazimierczuk
Download or read book Resonant Power Converters written by Marian K. Kazimierczuk. This book was released on 2012-11-07. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to resonant energy conversion in power electronics. It is a practical, systematic guide to the analysis and design of various dc-dc resonant inverters, high-frequency rectifiers, and dc-dc resonant converters that are building blocks of many of today's high-frequency energy processors. Designed to function as both a superior senior-to-graduate level textbook for electrical engineering courses and a valuable professional reference for practicing engineers, it provides students and engineers with a solid grasp of existing high-frequency technology, while acquainting them with a number of easy-to-use tools for the analysis and design of resonant power circuits. Resonant power conversion technology is now a very hot area and in the center of the renewable energy and energy harvesting technologies.
Author : Fahad Alaql
Release : 2021
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Analysis and Design of LLC Resonant Converters for Wide, Low-input, High-output Voltage DC Bus Applications by : Fahad Alaql
Download or read book Analysis and Design of LLC Resonant Converters for Wide, Low-input, High-output Voltage DC Bus Applications written by Fahad Alaql. This book was released on 2021. Available in PDF, EPUB and Kindle. Book excerpt: Today's large-scale utility applications with microinverter and batteries require DC/DC converters with a wide voltage range capabilities in order to fulfil the wide voltage system requirements. It has been shown that the LLC resonant converter is a good solution for wide voltage range applications because it is typically controlled by frequency-modulation. However, to achieve a wide voltage range, the LLC converter needs to operate in a wide switching-frequency range. This leads to increased switching losses and increased circulating current. Moreover, a small inductor ratio or/and low-quality factor are required to increase the voltage gain. Therefore, the small magnetizing inductance causes a high magnetizing current with high conduction loss, making it hard to design magnetic components. Several resonant converters for wide voltage range applications have been proposed in the open literature to improve efficiency. In first part, a novel LLC converter with a reconfigurable rectifier structure is proposed to regulate the wide voltage range photovoltaic (PV) panel. The proposed converter can operate in three operation modes that leads to a narrow switching-frequency range close to the resonant-frequency resulting in increased converter performance efficiency. The benefits of this topology include improved efficiency and narrow switchingfrequency range while achieving soft-switching in all MOSFETs and diodes. In second part, a new three-port LLC converter for a PV microinverter with high-DC bus applications is proposed. Two control modulations are adopted to regulate the power flow. On the primary side, two switches are implemented to reduce the conduction losses. On the secondary side, two rectifiers are employed in one structure to make the proposed converter operate close to the resonant-frequency and to boost the voltage with a moderate transformer. The proposed converter can achieve softswitching for all MOSFETs and diodes, resulting in improved efficiency and realizing a narrow switching-frequency range.
