EPE Association: EPE 2011 - DS2j: Topic 17: Power Supplies II

EPE 2011 - DS2j: Topic 17: Power Supplies II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 17: Power supplies > EPE 2011 - DS2j: Topic 17: Power Supplies II

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   A New Approach to Higher Density Rectifier with SiC Power Devices for 380V DC Distribution System
By Yusuke HAYASHI, Masato MINO [View]
[Download]

Abstract: A new approach has been proposed for creating higher power density 200Vac / 380Vdc converters to be installed in 380 V DC distribution systems. This approach requires a high density 3-Phase PWM converter. A SiC-JFETs and SiC-SBDs pair is attractive because of its low conduction loss created by a synchronous rectification and low switching loss by using uni-polar power devices. A design has already been proposed and experimentally verified. The feasibility has been proven by comparing it with the existing power unit for 380 V DC distribution systems.

   Comparative Estimation of Efficiency of LED Dimmers at Different Modulation Techniques
By Ilya GALKIN, Oleg TETERVENOK, Irena MILASHEVSKI [View]
[Download]

Abstract: There are two basic ways to improve the energy efficiency of lighting equipment - utilization of more effective technologies of light generation and implementation of intelligent control of lighting (providing the light where and when it is needed). LED lighting technology provides both these opportunities: LED luminaries have high efficacy and it is possible to dim them. At the same time LED lamps always require some electronic ballast. Operation of these ballasts depends on their topology and control features. This paper estimates the efficiency of several LED (buck, boost and buck-boost voltage converters) ballasts at different modulation approaches (pulse width modulation, frequency modulation) and operation conditions. The efficiency is analyzed numerically, simulated and experimentally tested.

   Contactless Energy Transfer System for Computer Peripherals
By Pascal MEYER, Paolo GERMANO, Yves PERRIARD [View]
[Download]

Abstract: A contactless energy transfer system to supply computer peripherals is under development. It consists of an array of primary coils that are integrated in a table and secondary coils placed under the peripherals. For an everyday use, it is unthinkable to supply continuously all the primaries. In this paper, the electronic implementation of the primary coils is presented, including the circuit used to detect peripherals and store their position above the table. Therefore, each primary coil has to integrate the possibility to be individually supplied. A strategy to locate the peripherals and then supply only the concerned primary coils has been developped and applied to a prototype. The process is controlled by a DSP and does not require additional sensors.

   Design Approach for the Cold Cathode Fluorescent Lamps Backlight Inverters with Lamp Current Balancing Chokes
By Tsun-Hsiao HSIA, Martin LEE, Dan CHEN, Chung-Ping KU [View]
[Download]

Abstract: Parallel resonant ballast inverters are often used to drive fluorescent light application including backlight for the cold cathode fluorescent lamps (CCFL) for liquid crystal display (LCD) units. Besides the traditional requirements of high efficiency, low EMI noise and dimming capability, there are two important requirements. Those are the array light level evenness and the quality of the lamp current waveform. The former is critical especially for very large screen display where CCFL are still attractive. And the latter affects the lifespan of the lamps if the harmonic content of the lamp current is high. Both of these performances are affected by the parasitic elements of both the lamp and the balancing chokes. The issue has never been tackled from an overall point of view. In this paper, theoretical model will be developed and design procedure proposed to determine the critical design parameters. Experiments based on a laboratory 200W prototype were conducted to verify the performance of the proposed circuit model. Although CCFL lamp was used for illustration and experimentation in this paper, the results of this paper are applicable to other lamp that use resonant circuit and inductor balancing chokes in the ballast circuit.

   High Frequency AC Distributed Power System for Fluorescent Lighting
By Patrick LUK, Seng Yim NG, Ken JINUPUN [View]
[Download]

Abstract: A novel High Frequency Alternating Current (HFAC) based fluorescent lighting system that distributes sinusoidal voltage and current to individual lamp drivers in a self-regulatory and modular fashion is proposed. The new system offers opportunities for energy savings, even lamp brightness, redundancy and reduced EMI noise capability compared to existing fluorescent lighting systems.

   Investigation of Tradeoffs between Efficiency, Power Density and Switching Frequency in Three-phase Two-level PWM Boost Rectifier
By Bo WEN, Dushan BOROYEVICH, Paolo MATTAVELLI [View]
[Download]

Abstract: Efficiency and power density are usually two important goals regarding power converter design. The focus of this paper is to develop an evaluation procedure to investigate the relationship between efficiency, power density and switching frequency. Three-phase two-level PWM boost rectifier is used as an example. Estimated efficiency and converter weight changing along with switching frequency and power rating are shown. A comparison with a hardware prototype is carried out to verify the estimation procedure.

   Multi-technology pre-sizing optimization of a generic inverter and its input filter
By Christophe LEDOUX, Pierre LEFRANC, Chérif LAROUCI [View]
[Download]

Abstract: This paper deals with an optimization approach of a three-phases inverter associated to a bus capacitor filter and a heatsink. This approach considers multi-technology components and a power semiconductors generic modelling. The optimized choice is performed with a Genetic Algorithm (GA) with the help of components databases for the semiconductors, capacitors and heatsinks. The aim is to minimize the overall volume by respecting electro-thermal constraints. Two optimizations are computed to analyze the switching frequency impact into the final result, the heatsink and bus capacitors volumes.

   Two phase interleaved buck converter for driving high power LEDs
By Szymon BECZKOWSKI, Stig MUNK-NIELSEN [View]
[Download]

Abstract: The goal of this paper is to evaluate an interleaved buck topology for driving high current light- emitting diodes. Low output capacitor value allows the use of non-electrolytic capacitors extending the lifetime of the converter. Converter is operated as a constant, regulated current source which increases luminous efficacy of LED compared to PWM dimmed system. Because of the low dynamic resistance of LEDs the duty cycle of the converter does not change greatly with controlled current. By setting the input voltage of the buck converter to around twice the voltage of diode strings, converter can be operated close to the 50\% duty cycle, where the ripple attenuation is the highest.

EPE 2011 - DS2j: Topic 17: Power Supplies II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 17: Power supplies > EPE 2011 - DS2j: Topic 17: Power Supplies II
	[return to parent folder]

	A New Approach to Higher Density Rectifier with SiC Power Devices for 380V DC Distribution System By Yusuke HAYASHI, Masato MINO	[View] [Download]
Abstract: A new approach has been proposed for creating higher power density 200Vac / 380Vdc converters to be installed in 380 V DC distribution systems. This approach requires a high density 3-Phase PWM converter. A SiC-JFETs and SiC-SBDs pair is attractive because of its low conduction loss created by a synchronous rectification and low switching loss by using uni-polar power devices. A design has already been proposed and experimentally verified. The feasibility has been proven by comparing it with the existing power unit for 380 V DC distribution systems.

	Comparative Estimation of Efficiency of LED Dimmers at Different Modulation Techniques By Ilya GALKIN, Oleg TETERVENOK, Irena MILASHEVSKI	[View] [Download]
Abstract: There are two basic ways to improve the energy efficiency of lighting equipment - utilization of more effective technologies of light generation and implementation of intelligent control of lighting (providing the light where and when it is needed). LED lighting technology provides both these opportunities: LED luminaries have high efficacy and it is possible to dim them. At the same time LED lamps always require some electronic ballast. Operation of these ballasts depends on their topology and control features. This paper estimates the efficiency of several LED (buck, boost and buck-boost voltage converters) ballasts at different modulation approaches (pulse width modulation, frequency modulation) and operation conditions. The efficiency is analyzed numerically, simulated and experimentally tested.

	Contactless Energy Transfer System for Computer Peripherals By Pascal MEYER, Paolo GERMANO, Yves PERRIARD	[View] [Download]
Abstract: A contactless energy transfer system to supply computer peripherals is under development. It consists of an array of primary coils that are integrated in a table and secondary coils placed under the peripherals. For an everyday use, it is unthinkable to supply continuously all the primaries. In this paper, the electronic implementation of the primary coils is presented, including the circuit used to detect peripherals and store their position above the table. Therefore, each primary coil has to integrate the possibility to be individually supplied. A strategy to locate the peripherals and then supply only the concerned primary coils has been developped and applied to a prototype. The process is controlled by a DSP and does not require additional sensors.

	Design Approach for the Cold Cathode Fluorescent Lamps Backlight Inverters with Lamp Current Balancing Chokes By Tsun-Hsiao HSIA, Martin LEE, Dan CHEN, Chung-Ping KU	[View] [Download]
Abstract: Parallel resonant ballast inverters are often used to drive fluorescent light application including backlight for the cold cathode fluorescent lamps (CCFL) for liquid crystal display (LCD) units. Besides the traditional requirements of high efficiency, low EMI noise and dimming capability, there are two important requirements. Those are the array light level evenness and the quality of the lamp current waveform. The former is critical especially for very large screen display where CCFL are still attractive. And the latter affects the lifespan of the lamps if the harmonic content of the lamp current is high. Both of these performances are affected by the parasitic elements of both the lamp and the balancing chokes. The issue has never been tackled from an overall point of view. In this paper, theoretical model will be developed and design procedure proposed to determine the critical design parameters. Experiments based on a laboratory 200W prototype were conducted to verify the performance of the proposed circuit model. Although CCFL lamp was used for illustration and experimentation in this paper, the results of this paper are applicable to other lamp that use resonant circuit and inductor balancing chokes in the ballast circuit.

	High Frequency AC Distributed Power System for Fluorescent Lighting By Patrick LUK, Seng Yim NG, Ken JINUPUN	[View] [Download]
Abstract: A novel High Frequency Alternating Current (HFAC) based fluorescent lighting system that distributes sinusoidal voltage and current to individual lamp drivers in a self-regulatory and modular fashion is proposed. The new system offers opportunities for energy savings, even lamp brightness, redundancy and reduced EMI noise capability compared to existing fluorescent lighting systems.

	Investigation of Tradeoffs between Efficiency, Power Density and Switching Frequency in Three-phase Two-level PWM Boost Rectifier By Bo WEN, Dushan BOROYEVICH, Paolo MATTAVELLI	[View] [Download]
Abstract: Efficiency and power density are usually two important goals regarding power converter design. The focus of this paper is to develop an evaluation procedure to investigate the relationship between efficiency, power density and switching frequency. Three-phase two-level PWM boost rectifier is used as an example. Estimated efficiency and converter weight changing along with switching frequency and power rating are shown. A comparison with a hardware prototype is carried out to verify the estimation procedure.

	Multi-technology pre-sizing optimization of a generic inverter and its input filter By Christophe LEDOUX, Pierre LEFRANC, Chérif LAROUCI	[View] [Download]
Abstract: This paper deals with an optimization approach of a three-phases inverter associated to a bus capacitor filter and a heatsink. This approach considers multi-technology components and a power semiconductors generic modelling. The optimized choice is performed with a Genetic Algorithm (GA) with the help of components databases for the semiconductors, capacitors and heatsinks. The aim is to minimize the overall volume by respecting electro-thermal constraints. Two optimizations are computed to analyze the switching frequency impact into the final result, the heatsink and bus capacitors volumes.

	Two phase interleaved buck converter for driving high power LEDs By Szymon BECZKOWSKI, Stig MUNK-NIELSEN	[View] [Download]
Abstract: The goal of this paper is to evaluate an interleaved buck topology for driving high current light- emitting diodes. Low output capacitor value allows the use of non-electrolytic capacitors extending the lifetime of the converter. Converter is operated as a constant, regulated current source which increases luminous efficacy of LED compared to PWM dimmed system. Because of the low dynamic resistance of LEDs the duty cycle of the converter does not change greatly with controlled current. By setting the input voltage of the buck converter to around twice the voltage of diode strings, converter can be operated close to the 50\% duty cycle, where the ripple attenuation is the highest.