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Analysis and EMI suppression of MHz frequency range switch mode power supplies
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University , 2013. , 139 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 164
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-21019Local ID: STCISBN: 978-91-87557-08-8 (print)OAI: oai:DiVA.org:miun-21019DiVA: diva2:686620
Supervisors
Available from: 2014-01-13 Created: 2014-01-13 Last updated: 2016-10-20Bibliographically approved
List of papers
1. High Frequency Half-Bridge Converter using Multilayered Coreless PrintedCircuit Board Step-Down Power Transformer
Open this publication in new window or tab >>High Frequency Half-Bridge Converter using Multilayered Coreless PrintedCircuit Board Step-Down Power Transformer
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2011 (English)In: 8th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2011-ECCE Asia, IEEE conference proceedings, 2011, 1177-1181 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper introduces high frequencyhalf bridgeDC-DC converter, using multilayered coreless Printed Circuit Board (PCB) step down power transformer. The converter is simulated and then implemented on a PCB. Complementary Pulse Width Modulated (PWM) signals are generated to turn on high and low side Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) alternately by a micro-controller. The isolated gate drive signals are provided to the high side MOSFET by using high frequency coreless PCB isolation transformer. We tested the converter for switching frequency range of 2 to 3 MHz, and for maximum input voltage up-to 170 V. The maximum output power achieved is 40 W and the maximum energy efficiency is approximately 82 %. © 2011 IEEE.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011
Keyword
Printed Circuit Board; Pulse Width Modulation; Switch Mode Power Supplies
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-14197 (URN)10.1109/ICPE.2011.5944712 (DOI)2-s2.0-80052080114 (Scopus ID)STC (Local ID)978-1-61284-956-0 (ISBN)978-1-61284-958-4 (ISBN)STC (Archive number)STC (OAI)
Conference
8th International Conference on Power Electronics - ECCE Asia May 30-June 3, 2011, The Shilla Jeju, Korea
Available from: 2011-07-19 Created: 2011-07-19 Last updated: 2016-10-19Bibliographically approved
2. High Frequency Full Bridge Converter using Multilayer Coreless Printed Circuit Board Step-up Power Transformer
Open this publication in new window or tab >>High Frequency Full Bridge Converter using Multilayer Coreless Printed Circuit Board Step-up Power Transformer
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2011 (English)In: 2011 20th European Conference on Circuit Theory and Design, ECCTD 2011, IEEE conference proceedings, 2011, 805-808 p.Conference paper, Published paper (Refereed)
Abstract [en]

In designing switch mode power supply (SMPS), thedesirable feature is to have an efficient and compact design. Themain idea is to increase the switching frequency and reduce thebulky magnetic parts of the converter. This leads to a compactsize, less weight, reduced cost and increased power density of theconverter. This paper presents a high frequency full bridge DC toDC converter, using a multilayer coreless printed circuit board(PCB) step-up power transformer. The converter was simulatedand also implemented on the PCB. The pulse width modulated(PWM) signals were generated, using a microcontroller, to switchthe Metal oxide semiconductor field effect transistor (MOSFET).The design of the converter is tested up to the power levels of 5Watts with the switching frequency in 2 to 3MHz range. Theenergy efficiency of the converter is 74.86% at 2.4 MHz.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011
Keyword
Full bridge converter; MHz frequency region; Multi layer PCB transformer; Power MOSFET; Switch mode power supply
National Category
Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-14583 (URN)10.1109/ECCTD.2011.6043837 (DOI)2-s2.0-80155123534 (Scopus ID)STC (Local ID)978-145770618-9 (ISBN)STC (Archive number)STC (OAI)
Conference
2011 20th European Conference on Circuit Theory and Design, ECCTD 2011;Linkoping;29 August 2011through31 August 2011;Category numberCFP11ECC-ART;Code87118
Available from: 2011-10-06 Created: 2011-10-06 Last updated: 2016-10-19Bibliographically approved
3. Analysis of feedback in converter using coreless printed circuit board transformer
Open this publication in new window or tab >>Analysis of feedback in converter using coreless printed circuit board transformer
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2011 (English)In: Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on, IEEE conference proceedings, 2011, 601-604 p.Conference paper, Published paper (Refereed)
Abstract [en]

Power supply is an inevitable component for all electronic instruments as a constant DC source. Almost all power supplies use feedback loop to achieve constant DC output voltage. In a feedback loop, the galvanic isolation is required between input and output. It can be achieved either by implementation of opto-coupler feedback on the secondary side or magnetic feedback. In this paper both opto-coupler and auxiliary feed-back techniques are implemented and analyzed in a high frequency half bridge converter using coreless Printed Circuit Board (PCB) power transformer. The implementation of opto-coupler feedback is temperature sensitive and has relatively high cost. The auxiliary winding of transformer can also be used to provide feedback signals as alternate to opto-coupler. Auxiliary feedback implementation is cheaper, temperature stable and insensitive to temperature variations. In this paper, the feasibility of feedback using auxiliary winding of coreless PCB power transformer is investigated. It is observed that this technique can be used as an alternative to opto-coupler feedback.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011
Keyword
Analog to digital conversion; Electro-magnetic interference; Switch mode power supplies; Printed circuit board; Pulse width modulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-14523 (URN)10.1109/ACEMP.2011.6490667 (DOI)2-s2.0-84876496931 (Scopus ID)STC (Local ID)978-1-4673-5002-0 (ISBN)STC (Archive number)STC (OAI)
Conference
International Aegean Conference on Electric Machines and Power Electronics & Electromotion Joint Conference 08-10 September 2011 İstanbul, Turkey
Available from: 2011-09-21 Created: 2011-09-22 Last updated: 2016-10-19Bibliographically approved
4. EMI filter design for high frequency power converters
Open this publication in new window or tab >>EMI filter design for high frequency power converters
2012 (English)In: 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012: Conference Proceedings, IEEE conference proceedings, 2012, 586-589 p.Conference paper, Oral presentation only (Refereed)
Abstract [en]

With the emerging power semiconductor devices in GaN and SiC technology and the development of high frequency multilayered PCB power transformers, power efficient DC-DC converters are designed in megahertz switching frequency range. The increased switching frequency in combination with sudden changes in current “di/dt” or voltage “dv/dt” levels generate higher order harmonics, which cause Electro Magnetic Interference (EMI). One of the major challenges, to design the power stage of these converters, is to minimize the EMI because it affects their Electro Magnetic Compatibility (EMC). There is a spread belief that the EMI becomes much worse in a MHz switching converter compared to the current ones operating below 150 kHz. This paper investigates the consequences on implementation of a line filter for suppressing conducted EMI in high frequency power converters. The results are based on electronic simulations, comparing EMI and filter design, for a 200 kHz and 2 MHz buck converter under similar conditions. By analyzing the noise frequency spectrum of both the converters it is observed that the size of filter components, such as capacitors and common mode chokes is greatly reduced in case of 2MHz Buck converter. The results show that the size reduction that can be accomplished by increasing the switching frequency to MHz range can be improved further by a smaller implementation of the line filter as well.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2012
Keyword
Electro Magnetic Interference, Electro Magnetic Compatibility, Line Impedance Stablizer Network, Pulse With
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-16524 (URN)10.1109/EEEIC.2012.6221444 (DOI)2-s2.0-84864246773 (Scopus ID)STC (Local ID)978-1-4577-1830-4 (ISBN)STC (Archive number)STC (OAI)
Conference
2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012;Venice;18 May 2012through25 May 2012;Category numberCFP1251I-CDR;Code91459
Available from: 2012-09-05 Created: 2012-06-21 Last updated: 2016-10-20Bibliographically approved
5. Design and implementation of EMI filter for high frequency (MHz) power converters
Open this publication in new window or tab >>Design and implementation of EMI filter for high frequency (MHz) power converters
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2012 (English)In: IEEE International Symposium on Electromagnetic Compatibility, IEEE conference proceedings, 2012, Art. no. 6396738- p.Conference paper, Published paper (Refereed)
Abstract [en]

The fabrication of emerging power semiconductor devices and high frequency PCB power transformers has made it possible to design the power converters in MHz switching frequency range. However, the higher switching frequency, di/dt loops and dv/dt nodes in power stages of these converters generate higher order harmonics which causes Electro Magnetic Interference (EMI). It is commonly believed that the EMI has worst affect in the converters switching in MHz frequency range than the converters operating below 150 kHz. Thus, it is important research direction to investigate the consequences of implementing a line filter to suppress the conducted EMI in high frequency power converters. In this paper, the measurements, and analysis of the conducted EMI in emerging power converters, switching in MHz frequency range, and the design of the filter for its suppression is presented. The design of LISN and its PCB implementation for EMI measurements is presented. The measurement of conducted EMI of a half bridge DC-DC converter switching at          3.45 MHz and the analysis of the frequency spectrum is discussed. The design, PCB implementation and characterization of the EMI filter and the measurement of the suppressed conducted noise by applying the filter are also discussed.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2012
Keyword
Electro Magnetic Compatibility; Electro Magnetic Interference; Line Impedance Stablization Network; Pulse Width Modulation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-16527 (URN)10.1109/EMCEurope.2012.6396738 (DOI)2-s2.0-84872565389 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Conference
International Symposium on Electromagnetic Compatibility, EMC EUROPE 2012;Rome;17 September 2012through21 September 2012;Code95036
Available from: 2012-10-01 Created: 2012-06-21 Last updated: 2016-10-20Bibliographically approved
6. EMI Suppression in High Frequency Half Bridge Converter
Open this publication in new window or tab >>EMI Suppression in High Frequency Half Bridge Converter
2013 (English)In: Elektronika ir Elektrotechnika, ISSN 1392-1215, Vol. 19, no 9, 75-80 p.Article in journal (Refereed) Published
Abstract [en]

Electromagnetic effects influence the design of power converters switching in MHz frequency region. In these converters, the high switching frequency in combination with sudden changes in current and voltage levels generate higher order harmonics which causes Electro Magnetic Interference (EMI). To study the effects of increased switching frequency on conducted EMI, the harmonics amplitudes are analyzed by increasing the switching frequency of a two wire input half bridge power converter from 1.32 MHz to 3 MHz. In order to suppress the Common Mode (CM) conducted EMI, different possibilities of connecting the Y- capacitor in a two wire universal input half bridge converter are discussed and the conducted EMI is measured and analyzed by connecting the Y- capacitor at different points. The line filters are designed, characterized and implemented in order to suppress conducted EMI. The effects of increased switching frequency on the line filter design are studied by analysing the EMI spectrum of both the converters. The analysis of results indicates that the filter size is reduced by increasing the switching frequency of the power converter. 

Place, publisher, year, edition, pages
Kauno Technologijos Universitetas Lithuania: , 2013
Keyword
Common Mode, Differential Mode, Electro Magnetic Interference, Electro Magnetic Compatibility, Line Impedance Stabilization Network
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-19737 (URN)10.5755/j01.eee.19.9.5653 (DOI)000330687100016 ()2-s2.0-84887494301 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Conference
17th International Conference 2013 Palanga
Note

Title registered incorrectly in Scopus: EMT suppression in high frequency half bridge converter

Available from: 2013-08-19 Created: 2013-08-19 Last updated: 2016-10-20Bibliographically approved
7. Analysis of radiated EMI for power converters switching in MHz frequency range
Open this publication in new window or tab >>Analysis of radiated EMI for power converters switching in MHz frequency range
2013 (English)In: Proceedings - 2013 9th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, SDEMPED 2013, IEEE conference proceedings, 2013, 428-432 p.Conference paper (Refereed)
Abstract [en]

The higher switching frequency in combination with di/dt loops and dv/dt nodes in the power stages of high frequency power converters generates higher order harmonics which cause Electro Magnetic Interference (EMI). It is commonly perceived that high frequency converters are more vulnerable to radiated EMI, thus, it is very important to analyze the radiated emission of these converters. According to the author’s knowledge, the analysis of the radiated emission of power converters switching in the MHz frequency region has not been presented until now. Therefore, in this paper, the measurements, and analysis of the near field radiated emissions of these emerging power converters is presented. These measurements are beneficial in the early design stage of power converters. Both E-field and H-field and captured and analyzed for a half bridge converter switching at 3 MHz and at the output power level of 25 W. The effects of the magnetic and electric field emissions with the addition of a Y-capacitor and secondary side common mode choke are analyzed.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2013
Keyword
bridge circuits;capacitors;electromagnetic interference;harmonics;switching convertors;E-field;EMI radiation;H-field;electromagnetic interference;frequency 3 MHz;half bridge converter switching;high frequency power converter generation;higher order harmonics;near field radiated emissions;power 25 W;power converter switching;power stages;switching frequency;Electromagnetic interference;Frequency conversion;Frequency measurement;Harmonic analysis;Inductors;Magnetic field measurement;Probes;Common Mode;Differential Mode;Electro Magnetic Compatibility;Electro Magnetic Interference
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-21017 (URN)10.1109/DEMPED.2013.6645751 (DOI)2-s2.0-84891097524 (Scopus ID)STC (Local ID)978 - 1 - 4799 - 002 5 - 1 (ISBN)STC (Archive number)STC (OAI)
Conference
2013 9th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, SDEMPED 2013; Valencia; Spain; 27 August 2013 through 30 August 2013; Category number CFP13SDE-ART; Code 101470
Available from: 2014-01-13 Created: 2014-01-13 Last updated: 2016-10-20Bibliographically approved

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