EPE Association: EPE 2014 - DS3g: Power Supplies

EPE 2014 - DS3g: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 07: Power Supplies > EPE 2014 - DS3g: Power Supplies

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   A novel current-limiting method for LLC DC/DC resonant converter
By Duan FEIYUE, Xu MING, Yang XU, Yao YUAN [View]
[Download]

Abstract: Constant current control is a difficult issue for LLC resonant converter due to its variable frequency operation.After detailed analysis on the short circuit operation of conventional LLC DC-DC converter, a novel current-limiting method with the help of diode clamping is proposed.Against the conventional wisdom,the switching frequency is reduced toward zero to control the output current under over-load and short circuit condition ultimately.By doing so,the ultra-high frequency operation can be avoided for current-limiting at short circuit.A 480W 12V/40A prototype with proposed concept has been built for verify the theoretical analysis.

   A Wide Range Power Cell for Modular Interleaving Supplies
By Matthias RADECKER, Yujia YANG, Andre Miguel NICOLINI, Li LE, Klaus-Dieter LANG, Paula KRUSE, Karin FEISTEL, Lucas TEIXEIRA, Daniel DENNSTEDT, Michael HERFURTH [View]
[Download]

Abstract: A modular interleaving power cell system for input voltage range of 19-265 V DC or AC consists of 15 or 6 Watts cells, operates at fixed frequency. A boost stage providing PFC, and an isolating regenerative snubber fly-back stage to deliver 30 V DC at the output is combined.

   Analysis and Design of a Boost-Buck Single Stage Topology for LED Lighting Applications
By Alexander PAWELLEK [View]
[Download]

Abstract: Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandes-cent 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 factors in order to improve the overall system. In addition, size and costs are a relevant factor in the highly competitive LED market. With the benefits of low costs and size, single stage, single switch topologies are well suited in general lighting applications, providing at on the one hand a constant current for the LEDs while inherent shaping the input current for fulfilling EMI regulations on the other hand.This paper presents an analytical solution and the complete design of a boost buck single stage, single switch topology for LED lamps. A prototype of a 12 W LED lamp verifies the analysis by experiment and shows a good performance at small size.

   Analysis and Design of a Partial-Multi-Resonant LLC Converter
By Markus BARWIG, Christian OEDER, Thomas DUERBAUM [View]
[Download]

Abstract: In this paper a resonant converter is shown, which is based on the series resonant parallel loaded LLCconverter. Limiting the voltage across the resonant capacitance with clamping diodes to the inputvoltage range as shown here, has several advantages like excellent zero voltage switchingperformance.

   Comparative Evaluation of Three-Phase Isolated Matrix-Type PFC Rectifier Concepts for High Efficiency 380VDC Supplies of Future Telco and Data Centers
By Patricio CORTES, Dominik BORTIS, Riccardo PITTINI, Johann Walter KOLAR [View]
[Download]

Abstract: Due to the high energy consumption in data and telco centers, the use of 380V or 400V DC facility-level distribution has been proposed as an alternative to the conventional AC distribution for a more efficient power delivery structure. The DC voltage is powered from the three-phase mains by a PFC rectifier and in many cases a mains transformer is used to enable galvanic isolation. In order to achieve a high efficiency in the DC voltage generation and to provide the required isolation, a single-stage concept, such as a matrix-type rectifier that enables PFC functionality and galvanic isolation in a single conversion, can be beneficial. In addition, due to the fact that with the matrix-type rectifier the galvanic isolation is performed with a high-frequency transformer, this results in a more compact rectifier system compared to conventional systems where the mains-frequency isolation transformer is located at the input of the PFC rectifier.In this paper, an overview of isolated matrix-type PFC rectifier topologies is given and a new converter circuit is proposed, analyzed and comparatively evaluated against another promising PFC rectifier concept, the phase-modular IMY-rectifier.

   Comparison of Integrated SEPIC-Buck and SEPIC-Çuk Converters as Off-line Dimmable LED Drivers with Reduced Storage Capacitor
By Ricardo PRADO, Marcelo COSETIN, Paulo Cesar LUZ, Thais BOLZAN [View]
[Download]

Abstract: This paper presents comparison of two integrated DC-DC converters topologies, SEPIC-Buck and SEPIC-Çuk as off-line dimmable LED drivers from a storage capacitance reduction point of view. Considering the low lifetime of electrolytic capacitors compared to that of LEDs, this study presents an analysis and design of two topologies which allows replace electrolytic capacitor by longer lifetime capacitor technology. Therefore it is necessary a significant storage capacitance reduction which is possible due to the proposed output current control strategy. Moreover the integrated topologies are compared in terms of efficiency and storage capacitance reduction.

   Efficiency Considerations for Non-Inverting Buck-Boost Converter Operating with Direct Current Control
By Ilya GALKIN, Olegs TETERVENOKS [View]
[Download]

Abstract: Amplitude mode LEDs light regulation is most functional when LEDs are supplied from current fed buck drivers, which practical implementation is conjunction of non-inverting buck-boost circuit, extra coil and specific control methods. This report experimentally evaluates the efficiency of drivers versions making focus on their conduction, commutation and inductor losses.

   Elimination of Electrolytic Capacitor in LED Power Supplies by Two-Phase Driving Approach
By Chi Shing WONG, Yuk Ming LAI, Ka Hong LOO, Chi Kong TSE [View]
[Download]

Abstract: A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. Inthe approach, two rectangular AC sources are employed so that the output current ripple can be signifi-cantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approachis realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the manda-tory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit formeeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existinginterleaved LED drivers that can only obtain low current ripples in certain operating points, the proposedapproach can maintain a constant output current at all times even under large duty cycle dynamics dueto the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototypeis built and tested experimentally.

   Experimental Evaluation of A 3kW High-Efficiency Inductive Contactless Power Transfer (ICPT) System for Electric Vehicles
By Yuki KAWAGUCHI, Masaaki YAMADA [View]
[Download]

Abstract: A 3-kW high-efficiency inductive-contactless-power-transfer (ICPT) system for electric vehicles was constructed and evaluated. The maximum efficiency of the prototype system is 93.6\% for a 20-cm air gap. Moreover, over 90\% efficiency is maintained across a wide range of air gaps at full load. To clarify the problem of improving efficiency under a wide range of air gaps, the loss characteristics of the prototype (which vary according to air gap) were analyzed. In addition, the magnetic-field distribution around the contactless transfer coil was evaluated by simulation and experimental measurements.

   Inverters characteristic analysis under different parameters of Wavelet PWM Technique
By Chunfang ZHENG, Bo ZHANG, Dongyuan QIU, Xiangmin XU [View]
[Download]

Abstract: This paper presents the principle and implementation of the wavelet PWM (WPWM) technique based on dyadic-type multi-resolution analyses (MRAs) for single-phase inverters, analyzes and gives the inverters output features at different parameters based on WPWM technique, which is beneficial to choose suitable parameters. Finally, according to the harmonic eliminating principle, compares WPWM with SPWM technique by some specific examples. The calculation and simulation results show that WPWM can get simpler realization by digital algorithm, higher fundamental component magnitudes and lower THD factors, but the range of fundamental component magnitude is smaller and the ability of eliminating lower harmonics is worse, which provide theoretical basis for the application of the WPWM efficiently in practice.

   Luenberger state observer based condition monitoring method in digitally controlled switching mode power supply
By Janne HANNONEN, Jari HONKANEN, Juha-Pekka STRÖM, Samuli RÄISÄNEN, Pertti SILVENTOINEN [View]
[Download]

Abstract: he use of digital control in switching mode power supplies has increased as the performance of programmable controller circuits have advanced. The use of digital control provides possibility to run monitoring, prognostics and maintenance functions alongside the system core control functions. This paper suggests a model based online condition monitoring method for DC-DC power supply, based on Luenberger state observer. It is shown that abnormal operating conditions, such as increased losses in main circuit, can be detected by monitoring the state observer adaptation value variations.

   The dynamic analysis and evaluation of hysteresis control Buck converter
By Jianfeng DAI, Jinbin ZHAO, Fen LI, Keqing QU [View]
[Download]

Abstract: A hysteresis control strategy based on the modulation of output voltage for Buck converter is proposed in this paper, which offers faster transient response and better stability. The small signal is derived ,dynamic analysis and evaluation of control strategy is performed and verified by simulation and experiment results.

EPE 2014 - DS3g: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 07: Power Supplies > EPE 2014 - DS3g: Power Supplies
	[return to parent folder]

	A novel current-limiting method for LLC DC/DC resonant converter By Duan FEIYUE, Xu MING, Yang XU, Yao YUAN	[View] [Download]
Abstract: Constant current control is a difficult issue for LLC resonant converter due to its variable frequency operation.After detailed analysis on the short circuit operation of conventional LLC DC-DC converter, a novel current-limiting method with the help of diode clamping is proposed.Against the conventional wisdom,the switching frequency is reduced toward zero to control the output current under over-load and short circuit condition ultimately.By doing so,the ultra-high frequency operation can be avoided for current-limiting at short circuit.A 480W 12V/40A prototype with proposed concept has been built for verify the theoretical analysis.

	A Wide Range Power Cell for Modular Interleaving Supplies By Matthias RADECKER, Yujia YANG, Andre Miguel NICOLINI, Li LE, Klaus-Dieter LANG, Paula KRUSE, Karin FEISTEL, Lucas TEIXEIRA, Daniel DENNSTEDT, Michael HERFURTH	[View] [Download]
Abstract: A modular interleaving power cell system for input voltage range of 19-265 V DC or AC consists of 15 or 6 Watts cells, operates at fixed frequency. A boost stage providing PFC, and an isolating regenerative snubber fly-back stage to deliver 30 V DC at the output is combined.

	Analysis and Design of a Boost-Buck Single Stage Topology for LED Lighting Applications By Alexander PAWELLEK	[View] [Download]
Abstract: Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandes-cent 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 factors in order to improve the overall system. In addition, size and costs are a relevant factor in the highly competitive LED market. With the benefits of low costs and size, single stage, single switch topologies are well suited in general lighting applications, providing at on the one hand a constant current for the LEDs while inherent shaping the input current for fulfilling EMI regulations on the other hand.This paper presents an analytical solution and the complete design of a boost buck single stage, single switch topology for LED lamps. A prototype of a 12 W LED lamp verifies the analysis by experiment and shows a good performance at small size.

	Analysis and Design of a Partial-Multi-Resonant LLC Converter By Markus BARWIG, Christian OEDER, Thomas DUERBAUM	[View] [Download]
Abstract: In this paper a resonant converter is shown, which is based on the series resonant parallel loaded LLCconverter. Limiting the voltage across the resonant capacitance with clamping diodes to the inputvoltage range as shown here, has several advantages like excellent zero voltage switchingperformance.

	Comparative Evaluation of Three-Phase Isolated Matrix-Type PFC Rectifier Concepts for High Efficiency 380VDC Supplies of Future Telco and Data Centers By Patricio CORTES, Dominik BORTIS, Riccardo PITTINI, Johann Walter KOLAR	[View] [Download]
Abstract: Due to the high energy consumption in data and telco centers, the use of 380V or 400V DC facility-level distribution has been proposed as an alternative to the conventional AC distribution for a more efficient power delivery structure. The DC voltage is powered from the three-phase mains by a PFC rectifier and in many cases a mains transformer is used to enable galvanic isolation. In order to achieve a high efficiency in the DC voltage generation and to provide the required isolation, a single-stage concept, such as a matrix-type rectifier that enables PFC functionality and galvanic isolation in a single conversion, can be beneficial. In addition, due to the fact that with the matrix-type rectifier the galvanic isolation is performed with a high-frequency transformer, this results in a more compact rectifier system compared to conventional systems where the mains-frequency isolation transformer is located at the input of the PFC rectifier.In this paper, an overview of isolated matrix-type PFC rectifier topologies is given and a new converter circuit is proposed, analyzed and comparatively evaluated against another promising PFC rectifier concept, the phase-modular IMY-rectifier.

	Comparison of Integrated SEPIC-Buck and SEPIC-Çuk Converters as Off-line Dimmable LED Drivers with Reduced Storage Capacitor By Ricardo PRADO, Marcelo COSETIN, Paulo Cesar LUZ, Thais BOLZAN	[View] [Download]
Abstract: This paper presents comparison of two integrated DC-DC converters topologies, SEPIC-Buck and SEPIC-Çuk as off-line dimmable LED drivers from a storage capacitance reduction point of view. Considering the low lifetime of electrolytic capacitors compared to that of LEDs, this study presents an analysis and design of two topologies which allows replace electrolytic capacitor by longer lifetime capacitor technology. Therefore it is necessary a significant storage capacitance reduction which is possible due to the proposed output current control strategy. Moreover the integrated topologies are compared in terms of efficiency and storage capacitance reduction.

	Efficiency Considerations for Non-Inverting Buck-Boost Converter Operating with Direct Current Control By Ilya GALKIN, Olegs TETERVENOKS	[View] [Download]
Abstract: Amplitude mode LEDs light regulation is most functional when LEDs are supplied from current fed buck drivers, which practical implementation is conjunction of non-inverting buck-boost circuit, extra coil and specific control methods. This report experimentally evaluates the efficiency of drivers versions making focus on their conduction, commutation and inductor losses.

	Elimination of Electrolytic Capacitor in LED Power Supplies by Two-Phase Driving Approach By Chi Shing WONG, Yuk Ming LAI, Ka Hong LOO, Chi Kong TSE	[View] [Download]
Abstract: A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. Inthe approach, two rectangular AC sources are employed so that the output current ripple can be signifi-cantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approachis realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the manda-tory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit formeeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existinginterleaved LED drivers that can only obtain low current ripples in certain operating points, the proposedapproach can maintain a constant output current at all times even under large duty cycle dynamics dueto the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototypeis built and tested experimentally.

	Experimental Evaluation of A 3kW High-Efficiency Inductive Contactless Power Transfer (ICPT) System for Electric Vehicles By Yuki KAWAGUCHI, Masaaki YAMADA	[View] [Download]
Abstract: A 3-kW high-efficiency inductive-contactless-power-transfer (ICPT) system for electric vehicles was constructed and evaluated. The maximum efficiency of the prototype system is 93.6\% for a 20-cm air gap. Moreover, over 90\% efficiency is maintained across a wide range of air gaps at full load. To clarify the problem of improving efficiency under a wide range of air gaps, the loss characteristics of the prototype (which vary according to air gap) were analyzed. In addition, the magnetic-field distribution around the contactless transfer coil was evaluated by simulation and experimental measurements.

	Inverters characteristic analysis under different parameters of Wavelet PWM Technique By Chunfang ZHENG, Bo ZHANG, Dongyuan QIU, Xiangmin XU	[View] [Download]
Abstract: This paper presents the principle and implementation of the wavelet PWM (WPWM) technique based on dyadic-type multi-resolution analyses (MRAs) for single-phase inverters, analyzes and gives the inverters output features at different parameters based on WPWM technique, which is beneficial to choose suitable parameters. Finally, according to the harmonic eliminating principle, compares WPWM with SPWM technique by some specific examples. The calculation and simulation results show that WPWM can get simpler realization by digital algorithm, higher fundamental component magnitudes and lower THD factors, but the range of fundamental component magnitude is smaller and the ability of eliminating lower harmonics is worse, which provide theoretical basis for the application of the WPWM efficiently in practice.

	Luenberger state observer based condition monitoring method in digitally controlled switching mode power supply By Janne HANNONEN, Jari HONKANEN, Juha-Pekka STRÖM, Samuli RÄISÄNEN, Pertti SILVENTOINEN	[View] [Download]
Abstract: he use of digital control in switching mode power supplies has increased as the performance of programmable controller circuits have advanced. The use of digital control provides possibility to run monitoring, prognostics and maintenance functions alongside the system core control functions. This paper suggests a model based online condition monitoring method for DC-DC power supply, based on Luenberger state observer. It is shown that abnormal operating conditions, such as increased losses in main circuit, can be detected by monitoring the state observer adaptation value variations.

	The dynamic analysis and evaluation of hysteresis control Buck converter By Jianfeng DAI, Jinbin ZHAO, Fen LI, Keqing QU	[View] [Download]
Abstract: A hysteresis control strategy based on the modulation of output voltage for Buck converter is proposed in this paper, which offers faster transient response and better stability. The small signal is derived ,dynamic analysis and evaluation of control strategy is performed and verified by simulation and experiment results.