A Study on the New Current Sharing Control of PWM Converters in Parallel Operation

ABSTRACT A Study on the New Current Sharing Control of PWM Converters in Parallel Operation By Nam-Ju Park Under the supervision of Prof. Dong-Seok Hyun, Ph.D.
Dept. of Electrical Engineering The Graduate School of Hanyang University

Recently, modern electrical equipment consumes more and more power because they have various functions and complexity in systems. In order to cope with high power consumption, usually PWM converters are operated in parallel instead of using one PWM converter having a big power capability. Parallel operation of PWM converter has many advantages over single operation of PWM converter such as various combination of output voltage, distribution of power, standardization of design, and easiness of heat dissipation. With the increment of power consumption, problems caused by unbalance between PWM converters become severe due to the parasitic components in the converter circuit, which considerably deteriorates the reliability of the system. Hence, it is highly demanded that the currents in each converter should be shared in accordance with the power capability of each converter.
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Analysis and Implementation of Switch Mode Power Supplies in MHz Frequency Region Abdul Majid

 

 

Analysis and Implementation of Switch Mode Power Supplies in MHz Frequency Region Abdul Majid © Abdul Majid, 2012 Electronics Design Division, in the Department of Information Technology and Media Mid Sweden University, SE-851 70 Sundsvall
Thesis work for the degree of Licentiate of Technology Sundsvall 2012
LINK ORIGINAL
http://miun.diva-portal.org/smash/get/diva2:543427/FULLTEXT01.pdf

High Frequency (MHz) Planar Transformers for Next Generation Switch Mode Power Supplies Radhika Ambatipudi Mid Sweden University Doctoral Thesis 159 - 2013

High Frequency (MHz) Planar Transformers for
Next Generation Switch Mode Power Supplies
Radhika Ambatipudi
Supervisors
Associate Professor Kent Bertilsson
Professor Bengt Oelmann
Department of Electronics Design
Mid Sweden University, SE-851 70 Sundsvall, Sweden

ABSTRACT
Increasing the power density of power electronic converters while reducing or maintaining the same cost, offers a higher potential to meet the current trend in relation to various power electronic applications. High power density converters can be achieved by increasing the switching frequency, due to which the bulkiest parts, such as transformer, inductors and the capacitor's size in the converter circuit can be drastically reduced. In this regard, highly integrated planar magnetics are considered as an effective approach compared to the conventional wire wound transformers in modern switch mode power supplies (SMPS). However, as the operating frequency of the transformers increase from several hundred kHz to MHz, numerous problems arise such as skin and proximity effects due to the induced eddy currents in the windings, leakage inductance and unbalanced magnetic flux distribution. In addition to this, the core losses which are functional dependent on frequency gets elevated as the operating frequency increases. Therefore, this thesis provides an insight towards the problems related to the high frequency magnetics and proposes a solution with regards to different aspects in relation to designing high power density, energy efficient transformers
LINK
http://miun.diva-portal.org/smash/get/diva2:665725/FULLTEXT01.pdf

Grid support by power electronic converters of Distributed Generation units Johan Morren

  Grid support by power electronic converters of Distributed Generation units Johan Morren For several reasons an increasing number of small Distributed Generation (DG) units are connected to the grid. Most DG units are relatively small and connected to the distribution network. The introduction of DG causes several problems, which are mainly related to the differences between DG units and conventional generators: they are located at other places in the network, they are operated in another way, they use other technologies, and they can not always control their power. Four problems have been considered in this thesis: damping of harmonics, voltage control, the behaviour of DG units during grid faults, and frequency control.
LINK
https://www.mediafire.com/?zxs8ojwm87i9b1q

Apresentação dos projetos de Física Aplicada da Eindhoven University of Technology

O Prof. Dr. Paul Koenraad, docente do Departamento de Física Aplicada, apresenta as instalações do departamento e algumas pesquisas que estão sendo desenvolvidas em na Eindhoven University of Technology.