EPE Association: EPE 2013 - DS2g: Power Supplies

EPE 2013 - DS2g: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 17: Power supplies > EPE 2013 - DS2g: Power Supplies

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   A Digital Communication System for a Control Strategy Employed in the Parallelism of Three- Phase Voltage Source Inverter
By Samir Ahmad MUSSA, Telles Brunelli LAZZARIN, Cesar Augusto ARBUGERI [View]
[Download]

Abstract: This paper describes a theoretical and experimental study on a digital communication system, which isemployed in a control strategy for parallelism of three-phase voltage inverter (VSI). This control strategy only needs that all VSIs use a same voltage reference and thus it ensures the sharing of the load current and avoids current circulation among the inverters during transient and steady-state operation. Therefore, the communication among the inverter is implemented to transmit only the voltage reference. The paper proposes this communication system based on two bus, one that uses the own electrical grid and is called of Voltage Reference bus and another makes by CAN bus. The first puts the reference voltage of all inverters in synchronism and the second keeps the reference voltage in synchronism even during a fault of electrical grid. The proposed system was digitally implemented in a TMS320F2812 DSP and was verified through experimental results with a 10 kVA prototype, which has the parallel operation of two three-phase VSIs.

   A NEW DC-DC DOUBLE BOOST QUADRATIC CONVERTER
By Samir Ahmad MUSSA, Francieli L. SA, Domingo RUIZ-CABALLERO [View]
[Download]

Abstract: This paper presents a study of a new dc-dc converter non-isolated high gain called Double Boost Quadratic Converter. The topological states, the waveforms of voltage and current, and the output characteristic graph of the converter are present in this paper. Besides, it is showed a comparison between simulation results and experimental results, confirming the theoretical analysis.

   About Tuning Capacitors in Inductive Coupled Power Transfer Systems
By Christophe AUVIGNE, Yves PERRIARD, Dimitrios LADAS [View]
[Download]

Abstract: Inductive Coupled Power Transfer (ICPT) is a widely used technique to transfer electrical power from a power supply to one or more load(s) without any physical link. Even with large airgaps between primary and secondary coils, a very high power transfer efficiency can be reached if the reactive energy stored in the coils is compensated. Several compensation strategies could be used depending on the application. In this paper, the classical compensation is compared to new control-oriented one. A 200W prototype has been realised in order to validate the models developed.

   Conceptual design of extra low voltage dc power supply for large scale superconducting coil of fusion magnet
By Hirotaka CHIKARAISHI [View]
[Download]

Abstract: The helical type fusion facility uses a huge superconducting dc magnet. To keep the coil current of the magnet, a high output current but extra low voltage power supply is necessary. This paper introduces a conceptual design of a dc power supply that using a mechanical conductor as switching devices.

   Consideration of Operating Frequency Variation in a Constant-On-Time Synchronous Buck Converter
By Chung-Ping KU, Wallance LIN, Dan CHEN [View]
[Download]

Abstract: A constant on-time PWM control with input feed-forward results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input voltage range. However, in practical design case, the operating frequency is changed by various load conditions. In this paper, variation of the switching frequency in a constant on-time Buck converter was analyzed in details. Experimental results were proposed to verify the characteristics.

   Design of Digitally Controlled Isolating 1-phase AC/DC Converter by Using Centralized Processing Unit
By Janne HANNONEN, Juha-Pekka STROM, Jari HONKANEN, Samuli RAISANEN, Olli POKKINEN, Pertti SILVENTOINEN [View]
[Download]

Abstract: This paper presents a fully digital control design for 1-phase 3 kW AC/DC converter. The centralized control system is designed and implemented on microcontroller-FPGA combination. This paper emphasizes the control design flexibility for switching mode power supplies when the programmable controller approach is used.

   Double-conversion UPS efficiency under varying mains conditions
By Lorenzo GIUNTINI, Andrea MANNUCCINI [View]
[Download]

Abstract: Efficiency is a fundamental UPS performance criterion. Remarkably, UPS efficiency in field applications may deviate from controlled laboratory conditions. This paper focuses on the impact of mains supply on double-conversion UPS efficiency. As the mains supply mostly affects the rectifier section, the results also provide a reference on the impact of mains supply on rectifier efficiency.

   Efficiency Improvements for High Frequency Resistance Spot Welding
By Martin WAGNER, Stefan KOLB [View]
[Download]

Abstract: Resistance spot welding uses direct current in the range of 1 kA to more than 100 kA to join sheetmetals. The current is provided by an inverter that is connected a dc-link capacitor and transformer witha high turns ratio. The current is rectified at the secondary side of the transformer. Since the voltagebetween the tips of the welding electrodes is in the range of only a few Volts the voltage drop acrossthe rectifier diodes contributes to high losses and therefore to a low efficiency. This paper presentsa new high frequency transformer optimized for welding applications, which consists of submodulesof planar transformers with integrated synchronous rectification, allowing size reduction and improvedcontrollability of the welding process while reducing the transformer size and losses thus increasing theoverall system efficiency. The potential of the new welding transformer is shown through experimentalresults.

   Flatness-Based-Control for Parallel Operation of N Voltage-Source Inverters
By Azeddine HOUARI, Serge PIERFEDERICI, Farid MEIBODY-TABAR, Alexandre BATTISTON [View]
[Download]

Abstract: Parallel voltage-source inverters with common dc bus present very interesting advantages from an industrial point of view. Indeed, by paralleling several units the power supply system includes capability to handle high power requirement, modularity and the possibility of maintenance through redundancy, within an uninterruptible supply operation. However, a special attention is required to avoid the negative effect of the circulating currents in such configuration caused essentially by the asynchronous switching operations of the Pulse Width Modulations (PWM) specified to each unit. To deal with this problem, in this contribution a one loop controller based on the flatness technique is proposed to an isolated power supply composed by N units. These units connect the same dc source and the ac load. The objective of the new sharing controller is to take some advantages of the flat proprieties of the system in order to ensure both reduction of the circulating currents and high power quality at the Point of Common Connection (PCC).

   Haptic tactile interface (HTI): Design of the power supply stage
By Christophe WINTER, Yves PERRIARD [View]
[Download]

Abstract: The driving electronics of an haptic tactile interface (HTI) is presented. The stability of its linear power amplifier under the capacitive load of the HTI piezoelectric actuator is analysed and ensured. As the HTI actuator is a resonant one, a topology to compensate its reactive power is presented allowing to reduce the size and the thermal heating of the power stage.

   Multilevel Boost DC-DC Converter Derived from Basic Double-Boost Converter
By Levy F. COSTA, Samir AHMAD MUSSA, Ivo BARBI [View]
[Download]

Abstract: This paper presents a nonisolated multilevel step-up dc-dc converter suitable for high power and high output voltage application. The main features of proposed converter are: reduced voltage across the semiconductors; low switching losses; and reduced volume of input inductor. This paper focuses on the five-level structure of the proposed converter, in which the theoretical analysis is carried out and discussed. The five-level proposed dc-dc converter has four capacitors and their voltages should be balanced for its correct operation. Therefore, a capacitor voltage balancing active control is presented and analyzed in detail herein. In order to demonstrate the performance of this converter, experimental results were obtained for an output power of 5kW. The results attest the advantages of the proposed dc-dc topology and it is reported herein.

   Off-line power supply solution for Home plug systems using ALTAIR05T-800 Primary Controller
By Fabio CACCIOTTO [View]
[Download]

Abstract: The article introduces an off-line power supply, using the ALTAIR05T-800, an innovative all-primarycontroller, by STMicroelectronics.Using the proprietary patented all-primary sensing feedback technique, the IC is capable of providingaccurate output voltage regulation and tight output current regulation, thus eliminating the need forany secondary side component.The proposed power supply is able to drive a complete power line communication system, providing aprecise double output voltage to supply the power line modem and the digital circuitry, included anexternal microcontroller.

   Power factor correction of large current line commutated converters using variable series capacitors
By Isao MATSUMOTO, Shinichi NOMURA [View]
[Download]

Abstract: Diode rectifiers and thyristor converters are very promising as a large current power supply for high field magnets such as fusion magnets, superconducting magnetic energy storage. The objective of this work is to discuss the power factor correction of the line commutated converters using variable series capacitors. The diode rectifier can control the DC voltage with a resulting leading power factor on the AC side by controlling the series capacitance. On the other hand, thyristor converters can control the DC voltage with a lagging power factor on the AC side by controlling the firing angle. Therefore, by combining the two, the hybrid converter system can control the DC voltage of high field magnets with both leading and lagging power factors seen from the AC system. Furthermore, the reactive power compensation need can be reduced to 50 \% compared to a full classical thyristor converter system with conventional shunt compensators. From the experimental results using a gate-commuted series capacitor (GCSC), the authors demonstrated the DC voltage control capability of the diode rectifier with a leading power factor, and the active and reactive power control capability of the hybrid converter system.

   Single ADC Single Loop Power Factor Correction using Pre-Calculated Duty Cycles
By Alberto SANCHEZ, Angel DE CASTRO, Javier GARRIDO [View]
[Download]

Abstract: PFC controllers usually need three sensors. A digital implementation with pre-calculated duty cycles can reduce the number of sensors. The disadvantage of using pre-calculated duty cycles is that power factor is very sensitive to any non-idealities, so some kind of regulation is necessary. A single ADC and single loop technique is proposed and it obtains a high power factor under non-nominal conditions.

   Unity power factor control and harmonic current reduction of thyristor converters using variable series capacitors
By Daisuke SAITO [View]
[Download]

Abstract: Thyristor converters will have high reliability for large current DC power supply system used for high filed magnets such as superconducting magnetic energy storage (SMES) and fusion devices. However, the thyristor converters control the DC voltage with a lagging power factor on the ac side. Especially, the lower DC voltage control requires the larger reactive power compensation. The authors carry out the experimental study on the leading power factor control of a thyristor converter using variable series capacitors. Combined with a pure thyristor converter operating with a lagging power factor, the power factor correction can be achieved. Additionally, the authors also investigate the harmonic current reduction by the effect of the combined thyristor converter system from the demonstration results and the simulation results. From the demonstration results of the 6 pulse combined thyristor converter system, the combination between the leading and lagging phase angles is selected to around 15 degree, the total harmonic distortion of the AC current can be reduced to that of the 12 pulse pure thyristor converter system case. Similarly, from the simulation results of the 12 pulse combined converter system, the combination between the leading and lagging phase angles is selected to 7.5 degree, the total line current waveform can be improved as similar waveforms of the 24 pulse pure thyristor converter system, which facts verified the harmonic current reduction by the effect of the combined thyristor converter concept.

EPE 2013 - DS2g: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 17: Power supplies > EPE 2013 - DS2g: Power Supplies
	[return to parent folder]

	A Digital Communication System for a Control Strategy Employed in the Parallelism of Three- Phase Voltage Source Inverter By Samir Ahmad MUSSA, Telles Brunelli LAZZARIN, Cesar Augusto ARBUGERI	[View] [Download]
Abstract: This paper describes a theoretical and experimental study on a digital communication system, which isemployed in a control strategy for parallelism of three-phase voltage inverter (VSI). This control strategy only needs that all VSIs use a same voltage reference and thus it ensures the sharing of the load current and avoids current circulation among the inverters during transient and steady-state operation. Therefore, the communication among the inverter is implemented to transmit only the voltage reference. The paper proposes this communication system based on two bus, one that uses the own electrical grid and is called of Voltage Reference bus and another makes by CAN bus. The first puts the reference voltage of all inverters in synchronism and the second keeps the reference voltage in synchronism even during a fault of electrical grid. The proposed system was digitally implemented in a TMS320F2812 DSP and was verified through experimental results with a 10 kVA prototype, which has the parallel operation of two three-phase VSIs.

	A NEW DC-DC DOUBLE BOOST QUADRATIC CONVERTER By Samir Ahmad MUSSA, Francieli L. SA, Domingo RUIZ-CABALLERO	[View] [Download]
Abstract: This paper presents a study of a new dc-dc converter non-isolated high gain called Double Boost Quadratic Converter. The topological states, the waveforms of voltage and current, and the output characteristic graph of the converter are present in this paper. Besides, it is showed a comparison between simulation results and experimental results, confirming the theoretical analysis.

	About Tuning Capacitors in Inductive Coupled Power Transfer Systems By Christophe AUVIGNE, Yves PERRIARD, Dimitrios LADAS	[View] [Download]
Abstract: Inductive Coupled Power Transfer (ICPT) is a widely used technique to transfer electrical power from a power supply to one or more load(s) without any physical link. Even with large airgaps between primary and secondary coils, a very high power transfer efficiency can be reached if the reactive energy stored in the coils is compensated. Several compensation strategies could be used depending on the application. In this paper, the classical compensation is compared to new control-oriented one. A 200W prototype has been realised in order to validate the models developed.

	Conceptual design of extra low voltage dc power supply for large scale superconducting coil of fusion magnet By Hirotaka CHIKARAISHI	[View] [Download]
Abstract: The helical type fusion facility uses a huge superconducting dc magnet. To keep the coil current of the magnet, a high output current but extra low voltage power supply is necessary. This paper introduces a conceptual design of a dc power supply that using a mechanical conductor as switching devices.

	Consideration of Operating Frequency Variation in a Constant-On-Time Synchronous Buck Converter By Chung-Ping KU, Wallance LIN, Dan CHEN	[View] [Download]
Abstract: A constant on-time PWM control with input feed-forward results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input voltage range. However, in practical design case, the operating frequency is changed by various load conditions. In this paper, variation of the switching frequency in a constant on-time Buck converter was analyzed in details. Experimental results were proposed to verify the characteristics.

	Design of Digitally Controlled Isolating 1-phase AC/DC Converter by Using Centralized Processing Unit By Janne HANNONEN, Juha-Pekka STROM, Jari HONKANEN, Samuli RAISANEN, Olli POKKINEN, Pertti SILVENTOINEN	[View] [Download]
Abstract: This paper presents a fully digital control design for 1-phase 3 kW AC/DC converter. The centralized control system is designed and implemented on microcontroller-FPGA combination. This paper emphasizes the control design flexibility for switching mode power supplies when the programmable controller approach is used.

	Double-conversion UPS efficiency under varying mains conditions By Lorenzo GIUNTINI, Andrea MANNUCCINI	[View] [Download]
Abstract: Efficiency is a fundamental UPS performance criterion. Remarkably, UPS efficiency in field applications may deviate from controlled laboratory conditions. This paper focuses on the impact of mains supply on double-conversion UPS efficiency. As the mains supply mostly affects the rectifier section, the results also provide a reference on the impact of mains supply on rectifier efficiency.

	Efficiency Improvements for High Frequency Resistance Spot Welding By Martin WAGNER, Stefan KOLB	[View] [Download]
Abstract: Resistance spot welding uses direct current in the range of 1 kA to more than 100 kA to join sheetmetals. The current is provided by an inverter that is connected a dc-link capacitor and transformer witha high turns ratio. The current is rectified at the secondary side of the transformer. Since the voltagebetween the tips of the welding electrodes is in the range of only a few Volts the voltage drop acrossthe rectifier diodes contributes to high losses and therefore to a low efficiency. This paper presentsa new high frequency transformer optimized for welding applications, which consists of submodulesof planar transformers with integrated synchronous rectification, allowing size reduction and improvedcontrollability of the welding process while reducing the transformer size and losses thus increasing theoverall system efficiency. The potential of the new welding transformer is shown through experimentalresults.

	Flatness-Based-Control for Parallel Operation of N Voltage-Source Inverters By Azeddine HOUARI, Serge PIERFEDERICI, Farid MEIBODY-TABAR, Alexandre BATTISTON	[View] [Download]
Abstract: Parallel voltage-source inverters with common dc bus present very interesting advantages from an industrial point of view. Indeed, by paralleling several units the power supply system includes capability to handle high power requirement, modularity and the possibility of maintenance through redundancy, within an uninterruptible supply operation. However, a special attention is required to avoid the negative effect of the circulating currents in such configuration caused essentially by the asynchronous switching operations of the Pulse Width Modulations (PWM) specified to each unit. To deal with this problem, in this contribution a one loop controller based on the flatness technique is proposed to an isolated power supply composed by N units. These units connect the same dc source and the ac load. The objective of the new sharing controller is to take some advantages of the flat proprieties of the system in order to ensure both reduction of the circulating currents and high power quality at the Point of Common Connection (PCC).

	Haptic tactile interface (HTI): Design of the power supply stage By Christophe WINTER, Yves PERRIARD	[View] [Download]
Abstract: The driving electronics of an haptic tactile interface (HTI) is presented. The stability of its linear power amplifier under the capacitive load of the HTI piezoelectric actuator is analysed and ensured. As the HTI actuator is a resonant one, a topology to compensate its reactive power is presented allowing to reduce the size and the thermal heating of the power stage.

	Multilevel Boost DC-DC Converter Derived from Basic Double-Boost Converter By Levy F. COSTA, Samir AHMAD MUSSA, Ivo BARBI	[View] [Download]
Abstract: This paper presents a nonisolated multilevel step-up dc-dc converter suitable for high power and high output voltage application. The main features of proposed converter are: reduced voltage across the semiconductors; low switching losses; and reduced volume of input inductor. This paper focuses on the five-level structure of the proposed converter, in which the theoretical analysis is carried out and discussed. The five-level proposed dc-dc converter has four capacitors and their voltages should be balanced for its correct operation. Therefore, a capacitor voltage balancing active control is presented and analyzed in detail herein. In order to demonstrate the performance of this converter, experimental results were obtained for an output power of 5kW. The results attest the advantages of the proposed dc-dc topology and it is reported herein.

	Off-line power supply solution for Home plug systems using ALTAIR05T-800 Primary Controller By Fabio CACCIOTTO	[View] [Download]
Abstract: The article introduces an off-line power supply, using the ALTAIR05T-800, an innovative all-primarycontroller, by STMicroelectronics.Using the proprietary patented all-primary sensing feedback technique, the IC is capable of providingaccurate output voltage regulation and tight output current regulation, thus eliminating the need forany secondary side component.The proposed power supply is able to drive a complete power line communication system, providing aprecise double output voltage to supply the power line modem and the digital circuitry, included anexternal microcontroller.

	Power factor correction of large current line commutated converters using variable series capacitors By Isao MATSUMOTO, Shinichi NOMURA	[View] [Download]
Abstract: Diode rectifiers and thyristor converters are very promising as a large current power supply for high field magnets such as fusion magnets, superconducting magnetic energy storage. The objective of this work is to discuss the power factor correction of the line commutated converters using variable series capacitors. The diode rectifier can control the DC voltage with a resulting leading power factor on the AC side by controlling the series capacitance. On the other hand, thyristor converters can control the DC voltage with a lagging power factor on the AC side by controlling the firing angle. Therefore, by combining the two, the hybrid converter system can control the DC voltage of high field magnets with both leading and lagging power factors seen from the AC system. Furthermore, the reactive power compensation need can be reduced to 50 \% compared to a full classical thyristor converter system with conventional shunt compensators. From the experimental results using a gate-commuted series capacitor (GCSC), the authors demonstrated the DC voltage control capability of the diode rectifier with a leading power factor, and the active and reactive power control capability of the hybrid converter system.

	Single ADC Single Loop Power Factor Correction using Pre-Calculated Duty Cycles By Alberto SANCHEZ, Angel DE CASTRO, Javier GARRIDO	[View] [Download]
Abstract: PFC controllers usually need three sensors. A digital implementation with pre-calculated duty cycles can reduce the number of sensors. The disadvantage of using pre-calculated duty cycles is that power factor is very sensitive to any non-idealities, so some kind of regulation is necessary. A single ADC and single loop technique is proposed and it obtains a high power factor under non-nominal conditions.

	Unity power factor control and harmonic current reduction of thyristor converters using variable series capacitors By Daisuke SAITO	[View] [Download]
Abstract: Thyristor converters will have high reliability for large current DC power supply system used for high filed magnets such as superconducting magnetic energy storage (SMES) and fusion devices. However, the thyristor converters control the DC voltage with a lagging power factor on the ac side. Especially, the lower DC voltage control requires the larger reactive power compensation. The authors carry out the experimental study on the leading power factor control of a thyristor converter using variable series capacitors. Combined with a pure thyristor converter operating with a lagging power factor, the power factor correction can be achieved. Additionally, the authors also investigate the harmonic current reduction by the effect of the combined thyristor converter system from the demonstration results and the simulation results. From the demonstration results of the 6 pulse combined thyristor converter system, the combination between the leading and lagging phase angles is selected to around 15 degree, the total harmonic distortion of the AC current can be reduced to that of the 12 pulse pure thyristor converter system case. Similarly, from the simulation results of the 12 pulse combined converter system, the combination between the leading and lagging phase angles is selected to 7.5 degree, the total line current waveform can be improved as similar waveforms of the 24 pulse pure thyristor converter system, which facts verified the harmonic current reduction by the effect of the combined thyristor converter concept.