EPE Association: EPE 2016 - DS2i: Power Supplies

EPE 2016 - DS2i: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 07: Power Supplies > EPE 2016 - DS2i: Power Supplies

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   An Advanced Control Device for Intelligent Lighting in DLT-Systems
By Lukas LOHAUS [View]
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Abstract: In existing installations, series-connected light switches or dimmers typically lack a neutral wire connectionat the light switch lead-out. Hence, it is a challenging issue to design and power wall-mountedcontrol terminals for smart LED lighting systems, which are not battery operated. Based on the resultsof [1, 2], this paper addresses the described problem and demonstrates an advanced control device fullycompliant with the 'Digital Load-Side Transmission' (DLT) standard [3]. In addition to a user interfacewith a liquid crystal display (LCD), this DLT control device provides two wireless links, namely WiFiand ZigBee, enabling external control from wireless devices. Besides brightness, color and color temperatureadjustment, the presented control device also features group control and commissioning of attachedluminaires. Standby power is minimized by featuring the so-called 'power controlled off state' of theDLT standard. The developed control device unites the advantages of low standby power consumption,compatibility to wiring in existing installations and accessibility with wireless controls. To the best ofthe authors knowledge, this is the first robustly tested DLT control device with such a high amount ofversatility and functionality.

   Analyses on Contactless Transformer and Power Control for Movable ICPT System
By Liming SHI [View]
[Download]

Abstract: A novel inductively coupled power transfer (ICPT) system for rail transmit is designed and tested. The primary windings of contactless transformer are divided several segments on ground which are powered by different high frequency inverter modules altenatively, the secondary windings beneath the vehicle are connected to rectifiers in series. The paramerters of inductances are derived and obtained according to the positon of the rail vehicle. Thses reduce evidently power fluctuation when the vehicle is running. The load voltage is adjusted effectively through double-loop control by detecting the inverter current and load voltage.

   Capacitive Current Balancing for Parallel-connected LED Strings with Tight Load-Regulation by Switch-Controlled Capacitor
By Chi Shing WONG [View]
[Download]

Abstract: This paper proposes a capacitive current balancing method for multistring LED lighting system driven bya LCC resonant converter. Different from conventional current balancing methods, this method replacesthe capacitor in the resonant tank by a switch-controlled capacitor (SCC) with which the output voltagecan be regulated by modulating the frequency of the resonant tank instead of the switching frequency ofthe converter. As a result, LED currents can be balanced and maintained to a desired value even for wideload and input voltage variations. A 70-W LCC resonant converter is built to validate the method.

   Lagrangian Derivation and Analysis of a Simple Equivalent Circuit Model of Wireless Power Transfer System with Dual Transmitting Resonators
By Takahiro KOYAMA [View]
[Download]

Abstract: This paper proposes a novel analysis method for the dual transmitting resonators wireless power transfer (DTR-WPT) system. The DTR-WPT is attractive for its higher efficiency and greater power transfer capability compared with the conventional single transmitting resonator wireless power transfer (STR-WPT) system. However, analytical understanding of the DTR-WPT is difficult due to its complicated operating principle caused by two transmitting resonators and a receiving resonator, which are all magnetically coupled each other. Therefore, practical applications of the DTR-WPT may be hindered by difficulty in establishing a design optimization method and a control scheme. This difficulty is addressed in this paper by proposing a novel simple equivalent circuit model of the DTR-WPT. Lagrangian dynamics is employed to derive this model. Brief analysis of this model showed improvement in the efficiency and the power transfer capability by the DTR-WPT compared with the conventional STR-WPT. In addition, the power transfer of the DTR-WPT system was found to be expressed by the same equivalent circuit model as the STR-WPT system. Therefore, similar design optimization methods and similar control schemes as for the STR-WPT are applicable to the DTR-WPT. Along with the theory, this paper presents experiments that verified appropriateness of the proposed model as well as the analysis results based on this model.

   LED-Ballasts in Lighting Applications - A Comparison of Cost Effective One Stage Topologies
By Alexander PAWELLEK [View]
[Download]

Abstract: Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandescent and fluorescent lamps due to their long life time and higher efficacy. Therefore, also the life time and efficiency of the LED ballast are important in order to improve the overall system. In addition, size and costs are relevant factors in the highly competitive LED market. The paper compares three different realizations of a one stage topology for LED lighting applications. The highly efficient ballasts provide on the one hand a ripple-free LED current, while fulfilling the regulation for the line current harmonics on the other hand. The investigation and optimization is validated by practical setups.

   Load monitoring and output voltage control for SP topology IPT system using a single controller without any output measurement
By Anawach SANGSWANG [View]
[Download]

Abstract: This paper presents the method to estimate load value and output voltage of the inductive power transfer (IPT) system with series-parallel (SP) compensation topology. This technique uses primary side measured variables without the need of secondary side measurement and communication devices between the circuits. In addition, the magnitude of the output voltage has been controlled by using only a single-side controller located in the primary circuit. The Phase shift (PS) control of the full- bridge inverter is used instead of the primary side DC-DC converter to regulate the output voltage. This lowers the overall system cost, size, complexity and loss compared to the conventional IPT dual- side controllers. The proposed estimation technique has been investigated through phasor analysis of the mutual inductance coupling model and also verified by the computer simulation. Performance of the proposed primary side single controller against the step change in output voltage reference and load value is shown in the simulation results. Experimental results of the output voltage control against load variation validating the viability of the proposed single-side controller.

   TRACKSIDE CONVERTER AS A PUBLIC GRID REPLACEMENT
By Will DE JAGER [View]
[Download]

Abstract: This paper describes a converter that converts the DC traction supply voltage on a catenary or 3rd rail into a 3-phase AC voltage that can be used as a replacement for a connection to the public grid. The input requirements are based on the electrical constraints of traction supply systems, which have a wide variation in the voltage level. The output requirements are specified by the electrical constraints of public grids, where harmonics are a point of attention. The design is based on a standard 2-level IGBT inverter and combined with input and output filters. A transformer is used for voltage adjustment and the creation of an earthed neutral point. Measurements on a test set up showed that the developed system meets the requirements of the public grid. It was experienced however, that capacitive loads, e.g. input filters of LED drivers cause large inrush and ripple currents requiring special attention and measures. A pilot converter is installed next to a tramway to supply LED lighting along the track. This has confirmed that the Trackside Converter system is suitable to act as a replacement of a public grid connection.

EPE 2016 - DS2i: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 07: Power Supplies > EPE 2016 - DS2i: Power Supplies
	[return to parent folder]

	An Advanced Control Device for Intelligent Lighting in DLT-Systems By Lukas LOHAUS	[View] [Download]
Abstract: In existing installations, series-connected light switches or dimmers typically lack a neutral wire connectionat the light switch lead-out. Hence, it is a challenging issue to design and power wall-mountedcontrol terminals for smart LED lighting systems, which are not battery operated. Based on the resultsof [1, 2], this paper addresses the described problem and demonstrates an advanced control device fullycompliant with the 'Digital Load-Side Transmission' (DLT) standard [3]. In addition to a user interfacewith a liquid crystal display (LCD), this DLT control device provides two wireless links, namely WiFiand ZigBee, enabling external control from wireless devices. Besides brightness, color and color temperatureadjustment, the presented control device also features group control and commissioning of attachedluminaires. Standby power is minimized by featuring the so-called 'power controlled off state' of theDLT standard. The developed control device unites the advantages of low standby power consumption,compatibility to wiring in existing installations and accessibility with wireless controls. To the best ofthe authors knowledge, this is the first robustly tested DLT control device with such a high amount ofversatility and functionality.

	Analyses on Contactless Transformer and Power Control for Movable ICPT System By Liming SHI	[View] [Download]
Abstract: A novel inductively coupled power transfer (ICPT) system for rail transmit is designed and tested. The primary windings of contactless transformer are divided several segments on ground which are powered by different high frequency inverter modules altenatively, the secondary windings beneath the vehicle are connected to rectifiers in series. The paramerters of inductances are derived and obtained according to the positon of the rail vehicle. Thses reduce evidently power fluctuation when the vehicle is running. The load voltage is adjusted effectively through double-loop control by detecting the inverter current and load voltage.

	Capacitive Current Balancing for Parallel-connected LED Strings with Tight Load-Regulation by Switch-Controlled Capacitor By Chi Shing WONG	[View] [Download]
Abstract: This paper proposes a capacitive current balancing method for multistring LED lighting system driven bya LCC resonant converter. Different from conventional current balancing methods, this method replacesthe capacitor in the resonant tank by a switch-controlled capacitor (SCC) with which the output voltagecan be regulated by modulating the frequency of the resonant tank instead of the switching frequency ofthe converter. As a result, LED currents can be balanced and maintained to a desired value even for wideload and input voltage variations. A 70-W LCC resonant converter is built to validate the method.

	Lagrangian Derivation and Analysis of a Simple Equivalent Circuit Model of Wireless Power Transfer System with Dual Transmitting Resonators By Takahiro KOYAMA	[View] [Download]
Abstract: This paper proposes a novel analysis method for the dual transmitting resonators wireless power transfer (DTR-WPT) system. The DTR-WPT is attractive for its higher efficiency and greater power transfer capability compared with the conventional single transmitting resonator wireless power transfer (STR-WPT) system. However, analytical understanding of the DTR-WPT is difficult due to its complicated operating principle caused by two transmitting resonators and a receiving resonator, which are all magnetically coupled each other. Therefore, practical applications of the DTR-WPT may be hindered by difficulty in establishing a design optimization method and a control scheme. This difficulty is addressed in this paper by proposing a novel simple equivalent circuit model of the DTR-WPT. Lagrangian dynamics is employed to derive this model. Brief analysis of this model showed improvement in the efficiency and the power transfer capability by the DTR-WPT compared with the conventional STR-WPT. In addition, the power transfer of the DTR-WPT system was found to be expressed by the same equivalent circuit model as the STR-WPT system. Therefore, similar design optimization methods and similar control schemes as for the STR-WPT are applicable to the DTR-WPT. Along with the theory, this paper presents experiments that verified appropriateness of the proposed model as well as the analysis results based on this model.

	LED-Ballasts in Lighting Applications - A Comparison of Cost Effective One Stage Topologies By Alexander PAWELLEK	[View] [Download]
Abstract: Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandescent and fluorescent lamps due to their long life time and higher efficacy. Therefore, also the life time and efficiency of the LED ballast are important in order to improve the overall system. In addition, size and costs are relevant factors in the highly competitive LED market. The paper compares three different realizations of a one stage topology for LED lighting applications. The highly efficient ballasts provide on the one hand a ripple-free LED current, while fulfilling the regulation for the line current harmonics on the other hand. The investigation and optimization is validated by practical setups.

	Load monitoring and output voltage control for SP topology IPT system using a single controller without any output measurement By Anawach SANGSWANG	[View] [Download]
Abstract: This paper presents the method to estimate load value and output voltage of the inductive power transfer (IPT) system with series-parallel (SP) compensation topology. This technique uses primary side measured variables without the need of secondary side measurement and communication devices between the circuits. In addition, the magnitude of the output voltage has been controlled by using only a single-side controller located in the primary circuit. The Phase shift (PS) control of the full- bridge inverter is used instead of the primary side DC-DC converter to regulate the output voltage. This lowers the overall system cost, size, complexity and loss compared to the conventional IPT dual- side controllers. The proposed estimation technique has been investigated through phasor analysis of the mutual inductance coupling model and also verified by the computer simulation. Performance of the proposed primary side single controller against the step change in output voltage reference and load value is shown in the simulation results. Experimental results of the output voltage control against load variation validating the viability of the proposed single-side controller.

	TRACKSIDE CONVERTER AS A PUBLIC GRID REPLACEMENT By Will DE JAGER	[View] [Download]
Abstract: This paper describes a converter that converts the DC traction supply voltage on a catenary or 3rd rail into a 3-phase AC voltage that can be used as a replacement for a connection to the public grid. The input requirements are based on the electrical constraints of traction supply systems, which have a wide variation in the voltage level. The output requirements are specified by the electrical constraints of public grids, where harmonics are a point of attention. The design is based on a standard 2-level IGBT inverter and combined with input and output filters. A transformer is used for voltage adjustment and the creation of an earthed neutral point. Measurements on a test set up showed that the developed system meets the requirements of the public grid. It was experienced however, that capacitive loads, e.g. input filters of LED drivers cause large inrush and ripple currents requiring special attention and measures. A pilot converter is installed next to a tramway to supply LED lighting along the track. This has confirmed that the Trackside Converter system is suitable to act as a replacement of a public grid connection.