EPE Association: EPE 2009 - Subtopic 04-5 - DS: 'Soft Switch Converters (Circuits and Control)'

EPE 2009 - Subtopic 04-5 - DS: 'Soft Switch Converters (Circuits and Control)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 04: 'Soft Switch Converters' > EPE 2009 - Subtopic 04-5 - DS: 'Soft Switch Converters (Circuits and Control)'

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   A low cost DSP-based control method for high frequency parallel resonant current-fed inverters
By Guillermo MARTIN-SEGURA, Joaquim LOPEZ-MESTRE, Hector RIVAS-GUERRERO, Miquel TEIXIDÃ“-CASAS, DANIEL MONTESINOS-MIRACLE [View]
[Download]

Abstract: Nowadays the possibility to increase switching frequency in power converters has allowed minimizing their size and weight, and has permitted the improvement of their power density. This has been achieved by using soft-switching techniques that reduce the switching losses and the stress the switches suffer, quite of this techniques relay on resonance concept. However this increase of frequency is not exempt of problems, and depending on the frequency it carries some problems in current sensing methods and in control precision. In order to solve these problems with an acceptable cost, a low-cost DSP-based control technique for current-fed parallel resonant inverters is presented. This technique uses gate signals as current measurement and the capture modules provided by most of microcontroller manufacturers. Such method decreases the cost, diminishes the analog components and its variability and improves the flexibility of the system. This technique is presented and applied to a 75 kHz and 6 kW prototype, obtaining favorable experimental results and demonstrating its feasibility.

   Analysis and design of PPFHB bidirectional DC-DC converter with coupled inductors
By Zhe ZHANG, C. Ole THOMSEN, A. E. Michael ANDERSEN [View]
[Download]

Abstract: In this paper, a novel push-pull-forward half-bridge (PPFHB) bi-directional DC-DC converter with coupled inductors is proposed. All switches can operate under zero-voltage-switching (ZVS). The operation principle with phase-shift modulation scheme, characteristics of coupled inductors, the steady state relationship and small-signal model are analyzed. The voltage controller based on the small-signal model in z-domain is designed. A 500W prototype controlled by TMS320F2808 DSP is implemented and tested. Experimental results show the validity of the analysis and design.

   Analysis of Circulating Energy into iZVT System: ZVT Case study Applied to a Double Conversion UPS
By Adriano Toniolo OLIVEIRA, Jumar LuÃs RUSSI, JosÃ© Renes PINHEIRO [View]
[Download]

Abstract: In this paper the circulating energy of an integrated auxiliary commutation circuit applied to a double-conversion uninterruptible power supply is analyzed. This analysis is based on a comparison between the circulating energy of Zero Voltage Transition (ZVT) and integrated Zero Voltage Transition (iZVT) in Auxiliary Commutation Circuits (ACC), both attached to the same doubleconversion UPS. Two advantages are obtained in relation to the classic ACC by using the technique of integration of ACC: the minimization of the reactive circulating energy and the reduction in the number of additional components. Thus, in iZVT UPS, it is obtained ZVT commutation for all the main switches and Zero Current Switching (ZCS) or Zero Voltage Switching (ZVS) for the auxiliary switches, while for the classic ZVT all auxiliary switches do not operate with soft-switching. In this way, the efficiency is increased and the electromagnetic interference (EMI) is reduced. The experimental results of the system rated at 1.2kW@70kHz are presented.

   Capacitor-Less Auxiliary Resonant Commutated Pole (ARCP) Voltage Source Soft Switching Inverter suitable for EV
By hisanori MORII, masayoshi MASAYOSHI, shigeyuki FUNABIKI, shinji SATO [View]
[Download]

Abstract: A novel Capacitor-Less Auxiliary Resonant Commutated Pole (ARCP) voltage source soft switching inverter which is suitable for high power applications such as EV, HEV and FC-EV is presented in this paper. The system performances of this soft-switching inverter is illustrated and evaluated on the basis of the experimental results.

   Control Design for a Very Low-Frequency High-Voltage Test System
By Zhiyu CAO, Norbert FRÃ–HLEKE, Joachim BÃ–CKER [View]
[Download]

Abstract: In recent two decades the application of high voltage test systems using the concept of very low frequency is more and more accepted by industries. This contribution deals with the control design for a novel high voltage test system generating a true sinus test voltage of 85 kV (RMS) at 0.1 Hz based on a zero-voltage switched LCC-resonant converter and a 3-stage Cockcroft Walton voltage multiplier rectifier. The cascade control strategy using an output current observer enables substitution of voluminous and costly high-voltage current sensors. The true sinus test generator was implemented and verified by experimental tests, affirming the optimum choice of the topology for the demanding requirements and indicating a better THD-quality of the test voltage as compared to previous solutions.

   Dynamic Current Sharing in Multiphase Active-Clamping Converters
By Jose A VILLAREJO, Esther DE JODAR, Antonio MATEO, Juan SUARDIAZ [View]
[Download]

Abstract: The high output impedance of active clamp buck and boost converters have been tested as a good method to achieve steady state current sharing among several power stages working in parallel. Nevertheless, dynamic current sharing among paralleled or interleaved phases must be ensured. In this work, the current share dynamic performance of this lossless passive equalization method is studied. Simulation and experimental results of three parallel buck converters, and three parallel power factor boost converters are presented in order to verify the theoretical approach reported in this paper

   Firing Strategy for Bidirectional Current Switches with Unidirectional Voltage Blocking Capability in Induction Heating Parallel Resonant Inverters
By Jose JORDÃN, Jose Miguel MAGRANER, Cesar CASES, Vicete ESTEVE, Enrique DEDE, AgustÃn FERERES, Juan B. EJEA, Eva GUMBAU [View]
[Download]

Abstract: A new firing strategy for a resonant current fed inverter based in switches formed only by IGBTs, without the series diode, is presented in this paper. It is described the behavior of the inverter topology proposed and two different strategies for its reliable operation are explained: control of the switching current level, and control of the over-current through the anti-parallel diodes. Dynamic behavior of the switches defines the frequency limit for the application of one strategy or the other. IGBTs without the series diode are bidirectional current switches with unidirectional blocking voltage capability. This characteristic must be taken into account to define an adequate switching strategy for this converter's topology. Two main advantages are the key issue for the use of this kind of switches: it is a cost-effective solution and the efficiency of the inverter is increased.

   High frequency inverter including a boost chopper
By Masao OOKOSHI [View]
[Download]

Abstract: This paper presents a new high frequency inverter for high power induction heating applications under a low utility voltage condition. This inverter realizes 2 functions in same time. One is a boost chopper function and other is a full bridge inverter. The boost chopper function of this inverter raises the DC bus voltage than an input voltage. Herewith, the boost chopper and one bridge realize an operation same as the full bridge inverter and a DC voltage is energized to the load resonant circuit positive and negative in turn. As this full bridge inverter operates under high DC bus voltage, the proposed inverter achieves high power without changing the input voltage to high. The proposed inverter has 6 switching modes including the voltage commutation mode for soft switching. The soft switching operations of S1 and S2 are obtained by connecting a small capacitor to S2 in parallel. Furthermore, the design rule of resonant capacitance is explained for tuning the resonant frequency appropriate by using some simple equations. Additionally, the maximum rated power also can be estimated by them, and it is verified by a simulation. The experimental results using a scale model of proposed inverter achieved about 3.2 times output power than the conventional full bridge inverter in a same load condition.

   Implementation of an Adaptive Sliding-Mode Control for a Quantum Series-Resonant Converter
By Fredrik VAN DER PIJL, Miguel CASTILLA, Pavol BAUER [View]
[Download]

Abstract: This paper describes experimental results obtained from a sliding-mode quantum controller implementation applied to a laboratory setup of a series-resonant converter. The motive for the design of the latter controller has been to achieve maximum operational efficiency. The newly formulated sliding surface indeed assures active minimization of the system energy loss in any arbitrary chosen full power range, while also assuring stable operation. The control method has a simple analogue implementation that has been verified in the laboratory.

   Step-Up ZVS Full-Bridge Converter with Primary-Side Loss Reduction
By Hung-I HSIEH [View]
[Download]

Abstract: A step-up ZVS full-bridge (FB) converter with a primary-side energy recovery circuit (PERC) is proposed. The PERC means can recover the power loss due to high spike current hiding in primary inductance when the phase-shift switching activates. High ringing currents occurring at the beginning of the two resonances each half-period can then be smoothly transferred to DC bus and restrain the resonant current profile from spike current, that provides normal operation for step-up mode conversion. High power efficiency up to 87\%-97\% is achieved for wide load range by PERC means, which improves efficiency over 3-5\% than the conventional case. A practical 400W step-up ZVS FB converter with PERC is realized to assess the conversion performance and compare with the prior works.

EPE 2009 - Subtopic 04-5 - DS: 'Soft Switch Converters (Circuits and Control)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 04: 'Soft Switch Converters' > EPE 2009 - Subtopic 04-5 - DS: 'Soft Switch Converters (Circuits and Control)'
	[return to parent folder]

	A low cost DSP-based control method for high frequency parallel resonant current-fed inverters By Guillermo MARTIN-SEGURA, Joaquim LOPEZ-MESTRE, Hector RIVAS-GUERRERO, Miquel TEIXIDÃ“-CASAS, DANIEL MONTESINOS-MIRACLE	[View] [Download]
Abstract: Nowadays the possibility to increase switching frequency in power converters has allowed minimizing their size and weight, and has permitted the improvement of their power density. This has been achieved by using soft-switching techniques that reduce the switching losses and the stress the switches suffer, quite of this techniques relay on resonance concept. However this increase of frequency is not exempt of problems, and depending on the frequency it carries some problems in current sensing methods and in control precision. In order to solve these problems with an acceptable cost, a low-cost DSP-based control technique for current-fed parallel resonant inverters is presented. This technique uses gate signals as current measurement and the capture modules provided by most of microcontroller manufacturers. Such method decreases the cost, diminishes the analog components and its variability and improves the flexibility of the system. This technique is presented and applied to a 75 kHz and 6 kW prototype, obtaining favorable experimental results and demonstrating its feasibility.

	Analysis and design of PPFHB bidirectional DC-DC converter with coupled inductors By Zhe ZHANG, C. Ole THOMSEN, A. E. Michael ANDERSEN	[View] [Download]
Abstract: In this paper, a novel push-pull-forward half-bridge (PPFHB) bi-directional DC-DC converter with coupled inductors is proposed. All switches can operate under zero-voltage-switching (ZVS). The operation principle with phase-shift modulation scheme, characteristics of coupled inductors, the steady state relationship and small-signal model are analyzed. The voltage controller based on the small-signal model in z-domain is designed. A 500W prototype controlled by TMS320F2808 DSP is implemented and tested. Experimental results show the validity of the analysis and design.

	Analysis of Circulating Energy into iZVT System: ZVT Case study Applied to a Double Conversion UPS By Adriano Toniolo OLIVEIRA, Jumar LuÃs RUSSI, JosÃ© Renes PINHEIRO	[View] [Download]
Abstract: In this paper the circulating energy of an integrated auxiliary commutation circuit applied to a double-conversion uninterruptible power supply is analyzed. This analysis is based on a comparison between the circulating energy of Zero Voltage Transition (ZVT) and integrated Zero Voltage Transition (iZVT) in Auxiliary Commutation Circuits (ACC), both attached to the same doubleconversion UPS. Two advantages are obtained in relation to the classic ACC by using the technique of integration of ACC: the minimization of the reactive circulating energy and the reduction in the number of additional components. Thus, in iZVT UPS, it is obtained ZVT commutation for all the main switches and Zero Current Switching (ZCS) or Zero Voltage Switching (ZVS) for the auxiliary switches, while for the classic ZVT all auxiliary switches do not operate with soft-switching. In this way, the efficiency is increased and the electromagnetic interference (EMI) is reduced. The experimental results of the system rated at 1.2kW@70kHz are presented.

	Capacitor-Less Auxiliary Resonant Commutated Pole (ARCP) Voltage Source Soft Switching Inverter suitable for EV By hisanori MORII, masayoshi MASAYOSHI, shigeyuki FUNABIKI, shinji SATO	[View] [Download]
Abstract: A novel Capacitor-Less Auxiliary Resonant Commutated Pole (ARCP) voltage source soft switching inverter which is suitable for high power applications such as EV, HEV and FC-EV is presented in this paper. The system performances of this soft-switching inverter is illustrated and evaluated on the basis of the experimental results.

	Control Design for a Very Low-Frequency High-Voltage Test System By Zhiyu CAO, Norbert FRÃ–HLEKE, Joachim BÃ–CKER	[View] [Download]
Abstract: In recent two decades the application of high voltage test systems using the concept of very low frequency is more and more accepted by industries. This contribution deals with the control design for a novel high voltage test system generating a true sinus test voltage of 85 kV (RMS) at 0.1 Hz based on a zero-voltage switched LCC-resonant converter and a 3-stage Cockcroft Walton voltage multiplier rectifier. The cascade control strategy using an output current observer enables substitution of voluminous and costly high-voltage current sensors. The true sinus test generator was implemented and verified by experimental tests, affirming the optimum choice of the topology for the demanding requirements and indicating a better THD-quality of the test voltage as compared to previous solutions.

	Dynamic Current Sharing in Multiphase Active-Clamping Converters By Jose A VILLAREJO, Esther DE JODAR, Antonio MATEO, Juan SUARDIAZ	[View] [Download]
Abstract: The high output impedance of active clamp buck and boost converters have been tested as a good method to achieve steady state current sharing among several power stages working in parallel. Nevertheless, dynamic current sharing among paralleled or interleaved phases must be ensured. In this work, the current share dynamic performance of this lossless passive equalization method is studied. Simulation and experimental results of three parallel buck converters, and three parallel power factor boost converters are presented in order to verify the theoretical approach reported in this paper

	Firing Strategy for Bidirectional Current Switches with Unidirectional Voltage Blocking Capability in Induction Heating Parallel Resonant Inverters By Jose JORDÃN, Jose Miguel MAGRANER, Cesar CASES, Vicete ESTEVE, Enrique DEDE, AgustÃn FERERES, Juan B. EJEA, Eva GUMBAU	[View] [Download]
Abstract: A new firing strategy for a resonant current fed inverter based in switches formed only by IGBTs, without the series diode, is presented in this paper. It is described the behavior of the inverter topology proposed and two different strategies for its reliable operation are explained: control of the switching current level, and control of the over-current through the anti-parallel diodes. Dynamic behavior of the switches defines the frequency limit for the application of one strategy or the other. IGBTs without the series diode are bidirectional current switches with unidirectional blocking voltage capability. This characteristic must be taken into account to define an adequate switching strategy for this converter's topology. Two main advantages are the key issue for the use of this kind of switches: it is a cost-effective solution and the efficiency of the inverter is increased.

	High frequency inverter including a boost chopper By Masao OOKOSHI	[View] [Download]
Abstract: This paper presents a new high frequency inverter for high power induction heating applications under a low utility voltage condition. This inverter realizes 2 functions in same time. One is a boost chopper function and other is a full bridge inverter. The boost chopper function of this inverter raises the DC bus voltage than an input voltage. Herewith, the boost chopper and one bridge realize an operation same as the full bridge inverter and a DC voltage is energized to the load resonant circuit positive and negative in turn. As this full bridge inverter operates under high DC bus voltage, the proposed inverter achieves high power without changing the input voltage to high. The proposed inverter has 6 switching modes including the voltage commutation mode for soft switching. The soft switching operations of S1 and S2 are obtained by connecting a small capacitor to S2 in parallel. Furthermore, the design rule of resonant capacitance is explained for tuning the resonant frequency appropriate by using some simple equations. Additionally, the maximum rated power also can be estimated by them, and it is verified by a simulation. The experimental results using a scale model of proposed inverter achieved about 3.2 times output power than the conventional full bridge inverter in a same load condition.

	Implementation of an Adaptive Sliding-Mode Control for a Quantum Series-Resonant Converter By Fredrik VAN DER PIJL, Miguel CASTILLA, Pavol BAUER	[View] [Download]
Abstract: This paper describes experimental results obtained from a sliding-mode quantum controller implementation applied to a laboratory setup of a series-resonant converter. The motive for the design of the latter controller has been to achieve maximum operational efficiency. The newly formulated sliding surface indeed assures active minimization of the system energy loss in any arbitrary chosen full power range, while also assuring stable operation. The control method has a simple analogue implementation that has been verified in the laboratory.

	Step-Up ZVS Full-Bridge Converter with Primary-Side Loss Reduction By Hung-I HSIEH	[View] [Download]
Abstract: A step-up ZVS full-bridge (FB) converter with a primary-side energy recovery circuit (PERC) is proposed. The PERC means can recover the power loss due to high spike current hiding in primary inductance when the phase-shift switching activates. High ringing currents occurring at the beginning of the two resonances each half-period can then be smoothly transferred to DC bus and restrain the resonant current profile from spike current, that provides normal operation for step-up mode conversion. High power efficiency up to 87\%-97\% is achieved for wide load range by PERC means, which improves efficiency over 3-5\% than the conventional case. A practical 400W step-up ZVS FB converter with PERC is realized to assess the conversion performance and compare with the prior works.