EPE Association: EPE 2005 - Topic 03-4a - DS: Soft switching converters (resonant, ZVS, ZCS)

EPE 2005 - Topic 03-4a - DS: Soft switching converters (resonant, ZVS, ZCS)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 03: SOFT SWITCHING CONVERTERS AND CONTROL > EPE 2005 - Topic 03-4a - DS: Soft switching converters (resonant, ZVS, ZCS)

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   A Half-Bridge Series Resonant Inverter for Induction Cookers using a Novel FPGA-based Control Strategy
By BERGER Gotthard; REIMANN Tobias; PETZOLDT Juergen; TIAN Jian; SCHERF Marko [View]
[Download]

Abstract: Asymmetrical pulse width modulation (APWM) with frequency tracking control strategy is proposed for half bridge series resonant inverter for induction cookers, by which inverter is operated at zerovoltage-switching (ZVS) over wide load range. The FPGA-based full digital control system construction and operation are described. Steady state characteristics, such as normalized output power, turn-off current and average current through switches, are calculated. Some designconsiderations including selection of snubber capacitor, determination of dead time, ZVS boundaryand presetting of phase-locked loop (PLL) are discussed. Finally, experiment results are given.

   A novel control strategy applied to the series loaded resonant converter
By LINNER Jorgen; RANSTAD Per; NEE Han [View]
[Download]

Abstract: An novel control strategy of the series loaded resonant converter is presented. The main objective of the control strategy is to minimize the switching losses in the main switching elements (IGBT). The results are experimentally verified on a 60kW/25kHz prototype converter. The IGBT losses obtained with the proposed control strategy are compared with those of the commonly used frequency control and phaseshift control strategies. With the proposed control strategy it is found that the losses are reduced in the entire operating range compared to phase-shift control. The same statement is valid also for frequency control, except for the highest output voltage.

   A Novel ZVT-ZCT PWM DC-DC Converter
By AKSOY Ismail; BODUR Haci; BAKAN A.Faruk [View]
[Download]

Abstract: In this paper, a novel active snubber cell which is used in a boost type DC-DC converter is proposed. The proposed snubber cell provides zero voltage transition (ZVT) and zero current transition (ZCT) for the main switch of the converter. All of the semiconductor devices turn on and off under soft switching. The converter has a simple structure and minimum number of components. Steady state analysis of the converter is presented, and theoretical analysis is verified by a prototype of a 1 kW and 100 kHz boost converter.

   DIGITAL CONTROL OF DUAL-LOADS LCLC RESONANT CONVERTERS
By FOSTER Martin; AN Yong Ann; STONE Dave; BINGHAM Chris [View]
[Download]

Abstract: The paper proposes the analysis, design and realisation of dual-output resonant LCLC converters with independent output regulation, employing a single power stage and combined PWM and frequency control. Asymmetric switching of the power devices is used to facilitate independent control of the outputs to provide 5V and 3.3V from a 15V-20V input supply over a range of load conditions.

   High Power Resonant toplogy for dc-dc converter
By COPPIN Julian; ENO Otu; THOMPSON David [View]
[Download]

Abstract: The paper presents a resonant dc-dc converter topology for the first stage of a two-stage converter to link a renewable energy source to a utility grid. For reliable input to a grid the inverter needs a stiff input dc voltage.To minimize switching loss and avoid switching over voltages a resonant converter is used. This also has the advantage of minimizing EMC. To gain the necessary dc voltage at the inverter input, it is necessary to use a dc/dc step-up converter. The necessary requirements are met with an H-bridge converter. Connected to the output of the converter is a series combination of the transformer primary and a capacitor such that the capacitor resonates with the transformer’sleakage inductance at the switching frequency. The transformer’s output is rectified and filtered for input to the inverter.Results from simulation tests confirm the current’s resonant pattern. Yet further results are shown of the converter’s performance at different loadings to confirm the zero-current switching effects. It is concluded that this converter topology provides a reliable basis for the application under consideration. Further analysis confirms its wider applicability.

   Modified Natural Commutated Switching Technique for HF Link DC/AC Converter
By SALAM Zainal; NGE Chee Lim [View]
[Download]

Abstract: This paper proposes a modified natural commutated control HF link inverter topology that consists of a center-tapped transformer and three bidirectional switching arms on the transformer secondary side. The topology is able to simultaneously utilize unipolar SPWM control scheme and natural commutation technique. The conversion efficiency is inherently high due to the existence of freewheeling periods per switching cycle and the utilization of zero current switching (ZCS) and zero voltage switching (ZVS) operation. Moreover, with minimum number of power switches at cycloconverter stage, the conduction loss can be further reduced. The operating principles of the proposed topology and switching technique are verified by simulation and experimental results.

   Novel Multi Resonant ZVS High Frequency Power Converter withHigh Efficiency Power Conversion
By HATANAKA Yoshihiro [View]
[Download]

Abstract: A novel multi resonant ZVS high frequency power converter (N MR-ZVS HF-PC) for low load resistance is developed. The high amplitude of the load current with suppressed switching current of the power converter ensures high efficiency of power conversion. The N MR-ZVS HF-PC is composed of only two passive circuit components of Cs and Cp except of Lo and Ro of load equivalent circuit for induction heating. The principle of ZVS operation of the N MR-ZVS HF-PC based on the multi resonant technology is elucidated. The new circuit topology that the current ratio of Ar of maximum load current and maximum switch current is defined only by capacitance ratio of Cp/Cs and is no relation to load condition of Lo, Ro and output frequency of fo is introduced. The ZVS operation region with variable output power in pulse frequency modulation (PFM) is numerically analyzed. The high efficiency operation of the N MR-ZVS HF-PC is verified by experiments.

   Predictive Control Strategies for ZCS Direct Converter HV Power Supply
By CATUCCI Maurizio; CLARE Jon; WHEELER Patrick [View]
[Download]

Abstract: This paper focuses on new control techniques for a direct power converter having a resonant tank on the output side feeding a rectifier. The application being considered is for HV power supplies. The objective of the control is to provide a stable output, with good supply current quality. Two predictive controllers are described, one based on the input filter dynamics and one based on the output tank dynamics, and their performances are compared. Practical results from a laboratory prototype are presented.

   The ARCP Flying Capacitor Inverter
By RADAN Ahmad; SAMARAM Mohammad [View]
[Download]

Abstract: Reduction of switching losses is an important issue in development of high power multilevel converters. Improvement of the known soft switching techniques to find application in multilevel topologies is therefore a worth attempt started recently. This paper proposes a new auxiliary circuit for the flying capacitor multilevel converters realizing soft switching conditions for these converters using the Auxiliary Resonant Commutated Pole (ARCP) technique. The proposed ARCP auxiliary circuit provides Zero-Voltage-Switching conditions for main switches without any extra voltage and current stresses on the main and auxiliary switches. The auxiliary switches operate in Zero-Current-Switching conditions as in case of ARCP circuit in a two-level converter. All degrees of freedom of space vector modulation remain available, so that any kind of PWM technique and current control strategy can be used without any constraint. The proposed auxiliary circuit operates also similarly for the redundant switching states of Multilevel Space Vector PWM being used for voltage control of flying capacitors. The results obtained from simulation and experimental set-up verify adequate operation of proposed auxiliary circuit.

   Zero-Voltage and Zero-Current Soft-Switching PWM Inverter
By HIRAKI Eiji [View]
[Download]

Abstract: This paper presents a zero-voltage and zero- current soft-switching (ZVZCS) PWM three phase inverter with a single auxiliary resonant commutation cell. All of the main switches in the three-phase inverter side can be turned on and turned off under zero-voltage and zero-current condition. The operating principle of proposed commutation cell is described, and the procedure to determine the optimum circuit parameters from the resonant equations is discussed. The performances of proposed ZVZCS three-phase inverter are discussed from the experimental and simulation points of view.

EPE 2005 - Topic 03-4a - DS: Soft switching converters (resonant, ZVS, ZCS)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 03: SOFT SWITCHING CONVERTERS AND CONTROL > EPE 2005 - Topic 03-4a - DS: Soft switching converters (resonant, ZVS, ZCS)
	[return to parent folder]

	A Half-Bridge Series Resonant Inverter for Induction Cookers using a Novel FPGA-based Control Strategy By BERGER Gotthard; REIMANN Tobias; PETZOLDT Juergen; TIAN Jian; SCHERF Marko	[View] [Download]
Abstract: Asymmetrical pulse width modulation (APWM) with frequency tracking control strategy is proposed for half bridge series resonant inverter for induction cookers, by which inverter is operated at zerovoltage-switching (ZVS) over wide load range. The FPGA-based full digital control system construction and operation are described. Steady state characteristics, such as normalized output power, turn-off current and average current through switches, are calculated. Some designconsiderations including selection of snubber capacitor, determination of dead time, ZVS boundaryand presetting of phase-locked loop (PLL) are discussed. Finally, experiment results are given.

	A novel control strategy applied to the series loaded resonant converter By LINNER Jorgen; RANSTAD Per; NEE Han	[View] [Download]
Abstract: An novel control strategy of the series loaded resonant converter is presented. The main objective of the control strategy is to minimize the switching losses in the main switching elements (IGBT). The results are experimentally verified on a 60kW/25kHz prototype converter. The IGBT losses obtained with the proposed control strategy are compared with those of the commonly used frequency control and phaseshift control strategies. With the proposed control strategy it is found that the losses are reduced in the entire operating range compared to phase-shift control. The same statement is valid also for frequency control, except for the highest output voltage.

	A Novel ZVT-ZCT PWM DC-DC Converter By AKSOY Ismail; BODUR Haci; BAKAN A.Faruk	[View] [Download]
Abstract: In this paper, a novel active snubber cell which is used in a boost type DC-DC converter is proposed. The proposed snubber cell provides zero voltage transition (ZVT) and zero current transition (ZCT) for the main switch of the converter. All of the semiconductor devices turn on and off under soft switching. The converter has a simple structure and minimum number of components. Steady state analysis of the converter is presented, and theoretical analysis is verified by a prototype of a 1 kW and 100 kHz boost converter.

	DIGITAL CONTROL OF DUAL-LOADS LCLC RESONANT CONVERTERS By FOSTER Martin; AN Yong Ann; STONE Dave; BINGHAM Chris	[View] [Download]
Abstract: The paper proposes the analysis, design and realisation of dual-output resonant LCLC converters with independent output regulation, employing a single power stage and combined PWM and frequency control. Asymmetric switching of the power devices is used to facilitate independent control of the outputs to provide 5V and 3.3V from a 15V-20V input supply over a range of load conditions.

	High Power Resonant toplogy for dc-dc converter By COPPIN Julian; ENO Otu; THOMPSON David	[View] [Download]
Abstract: The paper presents a resonant dc-dc converter topology for the first stage of a two-stage converter to link a renewable energy source to a utility grid. For reliable input to a grid the inverter needs a stiff input dc voltage.To minimize switching loss and avoid switching over voltages a resonant converter is used. This also has the advantage of minimizing EMC. To gain the necessary dc voltage at the inverter input, it is necessary to use a dc/dc step-up converter. The necessary requirements are met with an H-bridge converter. Connected to the output of the converter is a series combination of the transformer primary and a capacitor such that the capacitor resonates with the transformer’sleakage inductance at the switching frequency. The transformer’s output is rectified and filtered for input to the inverter.Results from simulation tests confirm the current’s resonant pattern. Yet further results are shown of the converter’s performance at different loadings to confirm the zero-current switching effects. It is concluded that this converter topology provides a reliable basis for the application under consideration. Further analysis confirms its wider applicability.

	Modified Natural Commutated Switching Technique for HF Link DC/AC Converter By SALAM Zainal; NGE Chee Lim	[View] [Download]
Abstract: This paper proposes a modified natural commutated control HF link inverter topology that consists of a center-tapped transformer and three bidirectional switching arms on the transformer secondary side. The topology is able to simultaneously utilize unipolar SPWM control scheme and natural commutation technique. The conversion efficiency is inherently high due to the existence of freewheeling periods per switching cycle and the utilization of zero current switching (ZCS) and zero voltage switching (ZVS) operation. Moreover, with minimum number of power switches at cycloconverter stage, the conduction loss can be further reduced. The operating principles of the proposed topology and switching technique are verified by simulation and experimental results.

	Novel Multi Resonant ZVS High Frequency Power Converter withHigh Efficiency Power Conversion By HATANAKA Yoshihiro	[View] [Download]
Abstract: A novel multi resonant ZVS high frequency power converter (N MR-ZVS HF-PC) for low load resistance is developed. The high amplitude of the load current with suppressed switching current of the power converter ensures high efficiency of power conversion. The N MR-ZVS HF-PC is composed of only two passive circuit components of Cs and Cp except of Lo and Ro of load equivalent circuit for induction heating. The principle of ZVS operation of the N MR-ZVS HF-PC based on the multi resonant technology is elucidated. The new circuit topology that the current ratio of Ar of maximum load current and maximum switch current is defined only by capacitance ratio of Cp/Cs and is no relation to load condition of Lo, Ro and output frequency of fo is introduced. The ZVS operation region with variable output power in pulse frequency modulation (PFM) is numerically analyzed. The high efficiency operation of the N MR-ZVS HF-PC is verified by experiments.

	Predictive Control Strategies for ZCS Direct Converter HV Power Supply By CATUCCI Maurizio; CLARE Jon; WHEELER Patrick	[View] [Download]
Abstract: This paper focuses on new control techniques for a direct power converter having a resonant tank on the output side feeding a rectifier. The application being considered is for HV power supplies. The objective of the control is to provide a stable output, with good supply current quality. Two predictive controllers are described, one based on the input filter dynamics and one based on the output tank dynamics, and their performances are compared. Practical results from a laboratory prototype are presented.

	The ARCP Flying Capacitor Inverter By RADAN Ahmad; SAMARAM Mohammad	[View] [Download]
Abstract: Reduction of switching losses is an important issue in development of high power multilevel converters. Improvement of the known soft switching techniques to find application in multilevel topologies is therefore a worth attempt started recently. This paper proposes a new auxiliary circuit for the flying capacitor multilevel converters realizing soft switching conditions for these converters using the Auxiliary Resonant Commutated Pole (ARCP) technique. The proposed ARCP auxiliary circuit provides Zero-Voltage-Switching conditions for main switches without any extra voltage and current stresses on the main and auxiliary switches. The auxiliary switches operate in Zero-Current-Switching conditions as in case of ARCP circuit in a two-level converter. All degrees of freedom of space vector modulation remain available, so that any kind of PWM technique and current control strategy can be used without any constraint. The proposed auxiliary circuit operates also similarly for the redundant switching states of Multilevel Space Vector PWM being used for voltage control of flying capacitors. The results obtained from simulation and experimental set-up verify adequate operation of proposed auxiliary circuit.

	Zero-Voltage and Zero-Current Soft-Switching PWM Inverter By HIRAKI Eiji	[View] [Download]
Abstract: This paper presents a zero-voltage and zero- current soft-switching (ZVZCS) PWM three phase inverter with a single auxiliary resonant commutation cell. All of the main switches in the three-phase inverter side can be turned on and turned off under zero-voltage and zero-current condition. The operating principle of proposed commutation cell is described, and the procedure to determine the optimum circuit parameters from the resonant equations is discussed. The performances of proposed ZVZCS three-phase inverter are discussed from the experimental and simulation points of view.