EPE Association: EPE 2009 - Subtopic 22-3

EPE 2009 - Subtopic 22-3 - DS: 'Education'
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   Comparative Study of Simulation Algorithm for Switching Converter
By Shotaro ONO, Terukazu SATO, Takashi NABESHIMA, Kimihiro NISHIJIMA [View]
[Download]

Abstract: This paper presents a comparative study of frequency analysis algorithms, i.e., State-Space Averaging Method (SSAM) and Fourier Transform Method (FTM) for switching converters. These two methods are reviewed briefly and a circuit simulator is implemented and demonstrated with several circuits, for example, a buck converter as a simple-structured circuit, a tapped-inductor converter as a resonant circuit, and a hysteretic circuit as a self-oscillation circuit. From the results, we can see that both methods can analyze almost all of the circuits. However, SSAM can not obtain correct results for some of them, for example, resonant circuit and hysteretic circuit. Whether correct results are obtained or not depends on circuit topology. To make use of rapidness of SSAM, a procedure to use SSAM with help of FTM is described.

   Economic and versatile laboratory setup for teaching power electronics in bachelor courses
By Uwe PROBST [View]
[Download]

Abstract: This paper presents a laboratory setup for teaching basics of power electronics. The setup consists of a 3 phase transformer, a rectifier and four half-bridges. The latter can be configured as DC-DC convert-ers (buck and full-bridge converter) or as AC-DC converters (one and three phase voltage-source in-verters). Different PWM control schemes as well as on-off current control are implemented. It allows doing experiments on a safe 24V DC voltage level and is economically priced. So a set of 10 setups is affordable and allows a number of 20 students to work on the same experiment in groups of 2 students simultaneously.

   Educational Tool for Teaching of Semiconductors
By RogÃ©rio SANTOS, Rui CHIBANTE, Armando ARAÃšJO, Adriano CARVALHO [View]
[Download]

Abstract: This paper presents an educational tool that enables exploring key aspects on semiconductor theory and power circuit analysis. With this tool it is possible to examine with accuracy the influence of device parameters and circuit parameters on circuit dynamic behavior, analyzing switching waveforms and typical switching parameters. The tool invokes an electrical circuit simulator (IsSpice) in order to simulate a selected circuit with parameters values defined by the user. Simulations are carried out using state-of-the art physics-based models for semiconductor devices. These models provide high quality simulation results and enable the user to explore the influence of technological and geometrical device parameters such as area, doping concentration, lifetime, etc. Besides, the model also provides a solution for the dynamic charge carrier distribution. So, 2D and 3D distribution curves can be easily graphed and compared with voltage/current time waveforms, making clear theoretical relationships concerning semiconductor behavior. Some possible examples to use in classroom are also presented.

   Experience with Spice teaching power electronics
By Stig MUNK-NIELSEN [View]
[Download]

Abstract: A free Spice version allowing general circuit simulation is used teaching power electronics. There is no lock on the circuit size, stabile and user friendly operation is experienced. A collection of transformer, converter and drive system models are implemented to investigate the usability of the programme in high power electronics.

   Microcontroller software applied to electronic ballast design
By JAVIER DIAZ RODRIGUEZ, FRANCISCO AZCONDO, ROSARIO CASANUEVA, CHRISTIAN BRAÃ‘AS [View]
[Download]

Abstract: This paper presents educational software for a PIC microcontroller used to study and design resonant electronic ballasts. The digitally controlled resonant inverter enables students to investigate the ballast behavior when changing the values of parameters. The soft start-up sequence and control of the LCsCp resonant inverter applied to supply high intensity discharge (HID) lamps is implemented in a PIC16F628. A new graphic interface BCP (Ballast Controlled by PIC Software) between student and microcontroller is presented.

   Simulation Tools of DC-DC Converters for Power Electronics Education
By FLÃVIO GONÃ‡ALVES, Carlos Alberto CANESIN, Leonardo Poltronieri SAMPAIO [View]
[Download]

Abstract: This paper presents interactive simulation tools to support the enhancement of power electronics education considering DC to DC converters. These interactive tools make use of the benefits of Java language to provide a dynamic and interactive visualization of simulations in steady-state for idealized non-isolated DC to DC converters. Additionally, this paper discusses the features and the usage of the interactive educational tools to serve as a first design tool for the laboratory experiments in the power electronics courses. In this way, some results were confronted with a well-known simulator package and with experimental results in order to validate the developed interactive simulation tools.

   Simulation Tools to Study Power Electronics
By Valery VODOVOZOV, Zoja RAUD, Tonu LEHTLA, Elmo PETTAI [View]
[Download]

Abstract: Simulation tools for learning power electronics are grounded aimed to study the circuit structure and execution and to evaluate the working possibilities in different duty modes of operation. The power converter estimation factors, features and characteristics are evaluated. Detailed explanation of the models of ac/dc, dc/ac, ac/ac and dc/dc power converters and their control circuits is given. The toolbox topology and operation possibilities and restrictions are represented.

   Stability of a DC/AC converter involving a sliding mode voltage controller
By Jean-Claude LE CLAIRE, Emmanuel FRAPPE [View]
[Download]

Abstract: Inverters are common in power converters, where they act as relays. The presented work deals with the stability of a DC/AC converter which implements an inverter and a novel sliding mode voltage controller. This controller drives the inverter. Then, by using simple automatic tools, it is shown that it is possible to prove the stability of such a power converter. A steady-state analysis is also done.

   Switched-capacitor programmable filter for power converters
By Federico BELLONI, Davide DELLA GIUSTINA, Piero G. MARANESI, Marco RIVA [View]
[Download]

Abstract: A switched-capacitor programmable filter is proposed as educational tool for the feedback compensation of power converters. The transfer function of the external feedback network, expressed in the Z-transform domain, can be assigned by means of Multiplying DACs. The cancellation of poles and zeros of switching power cells is precisely implemented even in the case they are complex. An ideal final single pole loop gain transfer function can be obtained after choosing the gain-bandwidth product and the dominant pole. Educational laboratories of power electronics in Universities awarding the MS and the Ph.D degrees can benefit from this tool. Duly reprogrammed, it avoids the realization of a dedicated controller for each power conversion exercise and it opens the possibility to investigate some aspects of the dynamic stability experimentally. The paper illustrates the compensation of a pulse width modulated step-down DC/DC converter. Measurements well fit the theoretical forecasts.

   Switching Power Supplies Design Tool for Educational Purposes in Power Electronics
By Pablo FERNANDEZ MIAJA, Diego GONZALEZ LAMAR, Manuel ARIAS, Alberto RODRIGUEZ, Marta Maria HERNANDO [View]
[Download]

Abstract: The static design of AC/DC and DC/DC switching power supplies relies on a simple but repetitive process. Although specific spreadsheets, avalaible in various CAD programs, are widely used, they are difficult to use in educational applications. In this paper a graphic tool programmed in MATLAB is presented to allow students to make a rapid static design. This tool has been successfully employed in the subject â€œSistemas ElectrÂ´onicos de AlimentaciÂ´onâ€ in the Telecommunications Engineering degree as part of the project of new education methods (University of Oviedo project PB-08-019). During practical sessions the students have used the tool to design the power supply, achieving better learning results than before it was used. In addition, the tool has been successfully used to improve the students, theoretical knowledge of the subject.

   Teaching drive control using Energetic Macroscopic Representation - expert level
By Alain BOUSCAYROL [View]
[Download]

Abstract: The Energetic Macroscopic Representation (EMR) has been developed in 2000 to develop control of electric drives. Since 2002 this graphical tool has been introduced to teach drive control in France, then Canada, Switzerland and China. The University of Lille proposes two drive control units using EMR for students in electrical engineering: initiation level and expert level. A first paper has described the initiation level with the simulation of an electric vehicle. This second paper deals with the content of the expert level unit and describes the simulation project of a wind energy conversion system using a MPPT (Maximal Power Point Tracking) strategy.

   Teaching Power Flow Oriented Modelling of Dynamic Systems - Basics
By Gert-Helge GEITNER, Wilfried HOFMANN [View]
[Download]

Abstract: The paper presents basics to use a compact menu-driven freeware Bond Graph block library for teaching power oriented modelling. Such energy domain independent modelling methods preserve the physical system structure, are applicably on conventional software and offer furthermore the use of common control structures or analysis tools. Models of electrical machines illustrate the features.

   Three beneficiaries of project-oriented education in power electronics
By FrÃ©dÃ©ric PLUMIER, Christophe GEUZAINE [View]
[Download]

Abstract: Power Electronics education at the University of LiÃ¨ge exhibits a particular feature, in that a person from industry is directly involved in the teaching of the introductory Power Electronics course since academic year 2007-2008. Together with him, we teach this subject making use of a project-oriented method. After two years of this experience, it is now of great interest to analyze the main benefits of this method for the students, the teaching team at the University and the company involved in the teaching process. In this paper we present through an example the method that is being used. We mention some interesting technical problems encountered by the students during their project work. We also present the evolution of the method from the first year of application in 2007-2008 to the forthcoming third year in 2009-2010.

EPE 2009 - Subtopic 22-3 - DS: 'Education'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 22: 'Education' > EPE 2009 - Subtopic 22-3 - DS: 'Education'
	[return to parent folder]

	Comparative Study of Simulation Algorithm for Switching Converter By Shotaro ONO, Terukazu SATO, Takashi NABESHIMA, Kimihiro NISHIJIMA	[View] [Download]
Abstract: This paper presents a comparative study of frequency analysis algorithms, i.e., State-Space Averaging Method (SSAM) and Fourier Transform Method (FTM) for switching converters. These two methods are reviewed briefly and a circuit simulator is implemented and demonstrated with several circuits, for example, a buck converter as a simple-structured circuit, a tapped-inductor converter as a resonant circuit, and a hysteretic circuit as a self-oscillation circuit. From the results, we can see that both methods can analyze almost all of the circuits. However, SSAM can not obtain correct results for some of them, for example, resonant circuit and hysteretic circuit. Whether correct results are obtained or not depends on circuit topology. To make use of rapidness of SSAM, a procedure to use SSAM with help of FTM is described.

	Economic and versatile laboratory setup for teaching power electronics in bachelor courses By Uwe PROBST	[View] [Download]
Abstract: This paper presents a laboratory setup for teaching basics of power electronics. The setup consists of a 3 phase transformer, a rectifier and four half-bridges. The latter can be configured as DC-DC convert-ers (buck and full-bridge converter) or as AC-DC converters (one and three phase voltage-source in-verters). Different PWM control schemes as well as on-off current control are implemented. It allows doing experiments on a safe 24V DC voltage level and is economically priced. So a set of 10 setups is affordable and allows a number of 20 students to work on the same experiment in groups of 2 students simultaneously.

	Educational Tool for Teaching of Semiconductors By RogÃ©rio SANTOS, Rui CHIBANTE, Armando ARAÃšJO, Adriano CARVALHO	[View] [Download]
Abstract: This paper presents an educational tool that enables exploring key aspects on semiconductor theory and power circuit analysis. With this tool it is possible to examine with accuracy the influence of device parameters and circuit parameters on circuit dynamic behavior, analyzing switching waveforms and typical switching parameters. The tool invokes an electrical circuit simulator (IsSpice) in order to simulate a selected circuit with parameters values defined by the user. Simulations are carried out using state-of-the art physics-based models for semiconductor devices. These models provide high quality simulation results and enable the user to explore the influence of technological and geometrical device parameters such as area, doping concentration, lifetime, etc. Besides, the model also provides a solution for the dynamic charge carrier distribution. So, 2D and 3D distribution curves can be easily graphed and compared with voltage/current time waveforms, making clear theoretical relationships concerning semiconductor behavior. Some possible examples to use in classroom are also presented.

	Experience with Spice teaching power electronics By Stig MUNK-NIELSEN	[View] [Download]
Abstract: A free Spice version allowing general circuit simulation is used teaching power electronics. There is no lock on the circuit size, stabile and user friendly operation is experienced. A collection of transformer, converter and drive system models are implemented to investigate the usability of the programme in high power electronics.

	Microcontroller software applied to electronic ballast design By JAVIER DIAZ RODRIGUEZ, FRANCISCO AZCONDO, ROSARIO CASANUEVA, CHRISTIAN BRAÃ‘AS	[View] [Download]
Abstract: This paper presents educational software for a PIC microcontroller used to study and design resonant electronic ballasts. The digitally controlled resonant inverter enables students to investigate the ballast behavior when changing the values of parameters. The soft start-up sequence and control of the LCsCp resonant inverter applied to supply high intensity discharge (HID) lamps is implemented in a PIC16F628. A new graphic interface BCP (Ballast Controlled by PIC Software) between student and microcontroller is presented.

	Simulation Tools of DC-DC Converters for Power Electronics Education By FLÃVIO GONÃ‡ALVES, Carlos Alberto CANESIN, Leonardo Poltronieri SAMPAIO	[View] [Download]
Abstract: This paper presents interactive simulation tools to support the enhancement of power electronics education considering DC to DC converters. These interactive tools make use of the benefits of Java language to provide a dynamic and interactive visualization of simulations in steady-state for idealized non-isolated DC to DC converters. Additionally, this paper discusses the features and the usage of the interactive educational tools to serve as a first design tool for the laboratory experiments in the power electronics courses. In this way, some results were confronted with a well-known simulator package and with experimental results in order to validate the developed interactive simulation tools.

	Simulation Tools to Study Power Electronics By Valery VODOVOZOV, Zoja RAUD, Tonu LEHTLA, Elmo PETTAI	[View] [Download]
Abstract: Simulation tools for learning power electronics are grounded aimed to study the circuit structure and execution and to evaluate the working possibilities in different duty modes of operation. The power converter estimation factors, features and characteristics are evaluated. Detailed explanation of the models of ac/dc, dc/ac, ac/ac and dc/dc power converters and their control circuits is given. The toolbox topology and operation possibilities and restrictions are represented.

	Stability of a DC/AC converter involving a sliding mode voltage controller By Jean-Claude LE CLAIRE, Emmanuel FRAPPE	[View] [Download]
Abstract: Inverters are common in power converters, where they act as relays. The presented work deals with the stability of a DC/AC converter which implements an inverter and a novel sliding mode voltage controller. This controller drives the inverter. Then, by using simple automatic tools, it is shown that it is possible to prove the stability of such a power converter. A steady-state analysis is also done.

	Switched-capacitor programmable filter for power converters By Federico BELLONI, Davide DELLA GIUSTINA, Piero G. MARANESI, Marco RIVA	[View] [Download]
Abstract: A switched-capacitor programmable filter is proposed as educational tool for the feedback compensation of power converters. The transfer function of the external feedback network, expressed in the Z-transform domain, can be assigned by means of Multiplying DACs. The cancellation of poles and zeros of switching power cells is precisely implemented even in the case they are complex. An ideal final single pole loop gain transfer function can be obtained after choosing the gain-bandwidth product and the dominant pole. Educational laboratories of power electronics in Universities awarding the MS and the Ph.D degrees can benefit from this tool. Duly reprogrammed, it avoids the realization of a dedicated controller for each power conversion exercise and it opens the possibility to investigate some aspects of the dynamic stability experimentally. The paper illustrates the compensation of a pulse width modulated step-down DC/DC converter. Measurements well fit the theoretical forecasts.

	Switching Power Supplies Design Tool for Educational Purposes in Power Electronics By Pablo FERNANDEZ MIAJA, Diego GONZALEZ LAMAR, Manuel ARIAS, Alberto RODRIGUEZ, Marta Maria HERNANDO	[View] [Download]
Abstract: The static design of AC/DC and DC/DC switching power supplies relies on a simple but repetitive process. Although specific spreadsheets, avalaible in various CAD programs, are widely used, they are difficult to use in educational applications. In this paper a graphic tool programmed in MATLAB is presented to allow students to make a rapid static design. This tool has been successfully employed in the subject â€œSistemas ElectrÂ´onicos de AlimentaciÂ´onâ€ in the Telecommunications Engineering degree as part of the project of new education methods (University of Oviedo project PB-08-019). During practical sessions the students have used the tool to design the power supply, achieving better learning results than before it was used. In addition, the tool has been successfully used to improve the students, theoretical knowledge of the subject.

	Teaching drive control using Energetic Macroscopic Representation - expert level By Alain BOUSCAYROL	[View] [Download]
Abstract: The Energetic Macroscopic Representation (EMR) has been developed in 2000 to develop control of electric drives. Since 2002 this graphical tool has been introduced to teach drive control in France, then Canada, Switzerland and China. The University of Lille proposes two drive control units using EMR for students in electrical engineering: initiation level and expert level. A first paper has described the initiation level with the simulation of an electric vehicle. This second paper deals with the content of the expert level unit and describes the simulation project of a wind energy conversion system using a MPPT (Maximal Power Point Tracking) strategy.

	Teaching Power Flow Oriented Modelling of Dynamic Systems - Basics By Gert-Helge GEITNER, Wilfried HOFMANN	[View] [Download]
Abstract: The paper presents basics to use a compact menu-driven freeware Bond Graph block library for teaching power oriented modelling. Such energy domain independent modelling methods preserve the physical system structure, are applicably on conventional software and offer furthermore the use of common control structures or analysis tools. Models of electrical machines illustrate the features.

	Three beneficiaries of project-oriented education in power electronics By FrÃ©dÃ©ric PLUMIER, Christophe GEUZAINE	[View] [Download]
Abstract: Power Electronics education at the University of LiÃ¨ge exhibits a particular feature, in that a person from industry is directly involved in the teaching of the introductory Power Electronics course since academic year 2007-2008. Together with him, we teach this subject making use of a project-oriented method. After two years of this experience, it is now of great interest to analyze the main benefits of this method for the students, the teaching team at the University and the company involved in the teaching process. In this paper we present through an example the method that is being used. We mention some interesting technical problems encountered by the students during their project work. We also present the evolution of the method from the first year of application in 2007-2008 to the forthcoming third year in 2009-2010.