Control and Optimization of Power in LLC Converter Using Phase Control

2018 Electric network topology

Author : Nagasri Kollipara
Release : 2018
Genre : Electric network topology
Kind : eBook
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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.

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

2016

Author : Heiko Figge
Release : 2016
Genre :
Kind : eBook
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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

Coordination and Control of Power Converters in Modern Power Systems

2023-12-12 Technology & Engineering

Author : Hao Tian
Release : 2023-12-12
Genre : Technology & Engineering
Kind : eBook
Book Rating : 996/5 ( reviews)

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Book Synopsis Coordination and Control of Power Converters in Modern Power Systems by : Hao Tian

Download or read book Coordination and Control of Power Converters in Modern Power Systems written by Hao Tian. This book was released on 2023-12-12. Available in PDF, EPUB and Kindle. Book excerpt:

LLC Resonant Converters

2022 TECHNOLOGY & ENGINEERING

Author : Claudio Adragna
Release : 2022
Genre : TECHNOLOGY & ENGINEERING
Kind : eBook
Book Rating : 675/5 ( 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. 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 of Power Electronic Converters and Systems

2018-04-27 Technology & Engineering

Author : Frede Blaabjerg
Release : 2018-04-27
Genre : Technology & Engineering
Kind : eBook
Book Rating : 68X/5 ( reviews)

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Book Synopsis Control of Power Electronic Converters and Systems by : Frede Blaabjerg

Download or read book Control of Power Electronic Converters and Systems written by Frede Blaabjerg. This book was released on 2018-04-27. Available in PDF, EPUB and Kindle. Book excerpt: Control of Power Electronic Converters, Volume Two gives the theory behind power electronic converter control and discusses the operation, modelling and control of basic converters. The main components of power electronics systems that produce a desired effect (energy conversion, robot motion, etc.) by controlling system variables (voltages and currents) are thoroughly covered. Both small (mobile phones, computer power supplies) and very large systems (trains, wind turbines, high voltage power lines) and their power ranges, from the Watt to the Gigawatt, are presented and explored. Users will find a focused resource on how to apply innovative control techniques for power converters and drives. - Discusses different applications and their control - Explains the most important controller design methods, both in analog and digital - Describes different, but important, applications that can be used in future industrial products - Covers voltage source converters in significant detail - Demonstrates applications across a much broader context

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