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Design and optimization of soft switched power converters for low and medium power applications
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.ORCID iD: 0000-0002-7802-0795
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University , 2016. , p. 119
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 128
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-29801Local ID: STCISBN: 978-91-88025-93-7 (print)OAI: oai:DiVA.org:miun-29801DiVA, id: diva2:1061332
Presentation
2016-12-12, C306, Sundsvall, 13:15 (English)
Supervisors
Note

Vid tidpunkten för seminariet var följande delarbeten opublicerade: delarbete 4 under granskning.

At the time of the licentiate seminar the following papers were unpublished: paper 4 under review.

Available from: 2017-01-02 Created: 2017-01-02 Last updated: 2017-06-29Bibliographically approved
List of papers
1. High frequency (MHz) soft switched flyback dc-dc converter using GaN switches and six-layered PCB transformer
Open this publication in new window or tab >>High frequency (MHz) soft switched flyback dc-dc converter using GaN switches and six-layered PCB transformer
2016 (English)In: IET Conference Publications, UK: Institution of Engineering and Technology, 2016, Vol. 2016, p. 1-6, article id CP684Conference paper, Published paper (Refereed)
Abstract [en]

The increased switching losses with increasing switching frequency are the biggest concerns in designing high power density converters. This paper presents the investigation of an energy efficient DC-DC flyback converter in combination with six layered printed circuit board transformer. The recorded efficiency of the low profile transformer for the frequency range of 1-5MHz is 98% at power density of 770W/in3. The proposed converter is characterized for frequencies up to 4MHz by using possible soft switching techniques such as Boundary Mode and Quasi Resonant Mode. The emerging Gallium Nitride (GaN FET) devices are used as power switch. The control is incorporated with Digital Signal Processor (dsPIC) for both the Boundary and Quasi Resonant Modes of operations. The proposed flyback DC-DC converter is tested on a prototype Printed Circuit Board (PCB). The performance of the proposed converter is investigated for the telecom input voltage range of 36-72Vdc. The maximum obtained energy efficiency of the converter is about 94%. According to the authors' knowledge, this is the maximum efficiency ever achieved in flyback converters switching in MHz frequency range. The results are very encouraging for the development of high frequency, high power density and low cost isolated power converters.

Place, publisher, year, edition, pages
UK: Institution of Engineering and Technology, 2016
Keyword
Flyback Converter, dc-dc converter, High frequency converter, Hybrid transformer, Efficient converters, low profile converters, PCB transformer
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-28956 (URN)10.1049/cp.2016.0154 (DOI)2-s2.0-85009100510 (Scopus ID)STC (Local ID)978-1-78561-188-9 (ISBN)STC (Archive number)STC (OAI)
Conference
8th IET International Conference on Power Electronics, Machines and Drives, PEMD 2016; Glasgow; United Kingdom; 19 April 2016 through 21 April 2016
Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2017-06-29Bibliographically approved
2. An improved modelling and construction of power transformer for controlled leakage inductance
Open this publication in new window or tab >>An improved modelling and construction of power transformer for controlled leakage inductance
2016 (English)In: Environment and Electrical Engineering (EEEIC), 2016 IEEE 16th International Conference on, IEEE, 2016Conference paper, Published paper (Refereed)
Abstract [en]

In this work, a transformer with increased leakage inductance for the soft switched power applications is presented as a practical solution by constructing a transformer with good control over the leakage inductance. An analytical reluctance based model is presented, which accurately predicts the leakage inductance. With the presented approach, a transformer is designed with a leakage inductance varying between 3-7μH. Increasing the efficiency and improving the power density has been the main focus of power electronics researchers in the recent years. In this regards, transformers with increased leakage inductance are becoming more popular in order to accomplish different soft switching concepts and for improving the power density.

Place, publisher, year, edition, pages
IEEE, 2016
Keyword
ZVS, Integrated transformer, Leakage inductance, Power density, Resonant Converters, Inductance, Windings, Ferrites, Mathematical model, Permeability
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-29006 (URN)10.1109/EEEIC.2016.7555605 (DOI)000387085800179 ()2-s2.0-84988409826 (Scopus ID)STC (Local ID)978-1-5090-2320-2 (ISBN)978-1-5090-2319-6 (ISBN)STC (Archive number)STC (OAI)
Conference
IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC), 7-10 June 2016 Florence, Italy
Available from: 2016-10-01 Created: 2016-10-01 Last updated: 2017-06-29Bibliographically approved
3. A phase shifted full bridge converter with novel control over the leakage inductance
Open this publication in new window or tab >>A phase shifted full bridge converter with novel control over the leakage inductance
2016 (English)In: 2016 18TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'16 ECCE EUROPE), Institute of Electrical and Electronics Engineers (IEEE), 2016, article id 7695545Conference paper, Published paper (Refereed)
Abstract [en]

The electronics industry is progressing towards the high density board solutions due to the requirement of compact and intelligent electronic systems. In order to meet the industry demands, the power system is required to be of high power density. This article proposes one of the solution to improve the power density for the medium power applications. In phase shifted full bridge converter, the intrinsic leakage inductance of the main transformer is not high enough to obtain the zero voltage switching of the power switches for the entire operating conditions. An additional shim inductor is usually connected in series with the primary winding of the main transformer to increase the collective leakage inductance. This additional shim inductor degrades the power density of the converter. This paper proposes a method to embed and control the resonance inductance inside the main transformer. In addition to the increased inter-winding spacing, this paper proposes a practical approach to integrate the ferrite rods inside the main transformer for further increase in the leakage inductance. A power transformer is constructed and investigated by using the modelled equations to estimate the leakage inductance. A prototype phase shifted full bridge converter is also developed to investigate the performance of the proposed transformer. The converter is designed for the switching frequency of 400kHz, and tested up to 600watts output power at the input voltage of 200Vdc. The performance of the proposed converter is also compared with the converter of using an external inductor. The investigations show that, in addition to the improved power density, the converter with the proposed transformer is more efficient than the converter with the traditional transformer.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016
Series
European Conference on Power Electronics and Applications, ISSN 2325-0313
Keyword
ZVS converter, Transformer, Device modelling, High power density systems, Efficiency
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-29392 (URN)10.1109/EPE.2016.7695545 (DOI)000386637300294 ()2-s2.0-84996605370 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Conference
18th European Conference on Power Electronics and Applications (EPE), SEP 05-09, 2016, GERMANY
Available from: 2016-12-02 Created: 2016-12-02 Last updated: 2017-06-29Bibliographically approved

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