EPE Association: EPE 1997 – 80: Dialogue Session DS2c: RESONANCE APPLICATIONS

EPE 1997 – 80: Dialogue Session DS2c: RESONANCE APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 80: Dialogue Session DS2c: RESONANCE APPLICATIONS

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   IMPROVEMENT OF THE POWER FACTOR OF DIMMERS USING HIGH FREQUENCY ZERO CURRENT SWITCHING
By K.-J. Lux; G. Schröder; H. Siebel; B. H. Yu [View]
[Download]

Abstract: With new EMI standards new converter structures and control methods are necessary. In the past usually phase control was the appropriate method for the control of simple ac loads (e.g. lamps). The disadvantage of phase control is generation of additional reactive power and of harmonics in the mains. The circuit proposed in this paper is able to reduce the harmonics in the mains significantly. Reactive power due to control is avoided. A enhanced version additionally avoids significant harmonics at the load side.

   NOVEL ZERO CURRENT SWITCHING HIGH FREQUENCY INVERTER APPLIED FOR AN EMISSION CONTROL IN DIESEL ENGINE
By Y. Hatanaka; S. Kubota; Y. Seldya [View]
[Download]

Abstract: This paper presents a new circuit topology of a novel zero current switching ( ZCS) high frequency inverter for induction heating and ultrasonic transducer system applied for an emission control in diesel engine. The ZCS characteristics are numerically analyzed in connection with normalized frequency and load. On the basis of numerical analysis, the high frequency power supply has been designed and experimented.

   DESIGN OF A LCC RESONANT INVERTER FOR HIGH FREQUENCY LAMP BALLAST, RESONANT CURRENT CONTROLLED, WITH HIGH POWER FACTOR
By F. Ferrero; M. Rico; J. Marcos; C. Blanco; E. Corominas; A. Calleja [View]
[Download]

Abstract: Analysis and design of a single-stage electronic ballast with unit power factor are presented in this paper. The proposed single-stage ballast is the combination of a boost converter and a full-bridge series-resonant parallel-loaded inverter. The boost semi-stage working in the discontinuous conduction mode functions as a power factor corrector and the inverter semi-stage operated above resonance is employed to the ballast lamp. The fundamental approximation is used to design the inverter at steady-state. A novel control method by resonant current allows to the bridge switches operating in points where the commutations are optimum and the reactive energy that the inverter handles is nil. The proposed lamp ballast can save a controller, reduce size and possibly increase system reliability over a conventional two-stage system. Experimental results from a lab prototype are used to verifY the design procedure.

   SELF-ADJUSTING RESONANT CONVERTERS AND APPLICATION BY HIGH POWER ELECTRICAL ARC FURNACES
By K. Janson: J. Järvik [View]
[Download]

Abstract: When solving the problems of electric power quality converters with high power factor and low level of current distortion are useful. Resonant converters of 50 (60) Hz AC-DC are described, where each half-cycle of network voltage the capacitor and inductor of an oscillatory circuit are switched from series into parallel and vice versa. ]ne duration of series and parallel connection and also the transformer ratio arc parametrically dependent on load. 50 Hz oscillatory circuit restrict higher harmonics. Parallel oscillatory circuit restricts short circuit current. Making use ofthyristors or transistors is not necessary for supplying electrical arc with variable voltage. These converters are network-friendly, with high power factor and suitable for fluctuating loads. When used with arc furnaces they enable to manage without expensive dynamic compensators. The operating principle of the converters, arc furnaces voltage and current control and Power Supply ESTA characteristics are discussed.

   SOFT SWITCHING INVERTER POWER SOURCE FOR ARC WELDING
By H. Mecke; W. Fischer; F. Werther [View]
[Download]

Abstract: Modem electronic power sources for arc welding are mostly based on tl1e inverter principle. The increase of switching frequency to about I 00 kHz is desirable for further improvement of control capabilities and to reduce dimensions and weight and can only be reached sufficiently with soft switched semiconductors. A new control method has been developed for the ZVZCS - PS - FB - converter considering the specific static and dynamic load conditions of arc welding. Simulation results and experimental verification give good operation conditions over the entire load range.

   A Novel Auxiliary Resonant Commutated Pole Inverter Topology with Zero Current Turn-off Switching
By Min-Hong Kim; Yo-Han Lee Dong-Seok Hyun [View]
[Download]

Abstract: This paper proposes a novel Auxiliary Resonant Conunutated Pole Inverter (ARCPI) topology. Many investigations for resonant converters have been studied and reported. Auxiliary Resonant Commutated Pole Inverter (ARCPI) is one of the most successful circuit topologies. However, the conventional ARCPis have the switching property like the general PWM inverters with the capacitive snubbers at turn-off. Therefore, as the load current increases, the turn-off switching losses may be so serious and can be so much considerable. The proposed ARCPI solves this problem, which can achieve ZCS at tun1-off with high frequency transformers, switches, and capacitors. The analyses and the characteristics for each operation mode of the proposed circuit are described indetail and the validity is verified by the simulation and experimental results.

   IGBT Half-Bridge Inverter for Induction Heating Applications with Active Auxiliary Resonant Circuit
By J. W. Jung; B. K. Lee; B. S. Suh; D. S. Hyun [View]
[Download]

Abstract: A New IGBT half-bridge inverter topology with active auxiliary resonant circuit (A 2RC) is proposed. The A2RC permits the large lossless turn-off snubber capacitor to be successfully used. Therefore, it makes IGBT be used efficiently in high power and high frequency induction heating system. The operation principle and the design procedures of the proposed A2RC are described in detail and the validity is verified by testing on a 55kHz IGBT half-bridge inverter for induction heating cooking system rated on 1.3kW.

   New Phase-Shifted Soft-Switching PWM Series Resonant Inverter Topologies and Their Practical Evaluations
By Eiji Hiraki; Satoshi Nagai; Yasuhiro Arai; A. Chibani; Mutsuo Nakaoka [View]
[Download]

Abstract: This paper presents three versions of soft-switching phase-shifted PWM with constant frequency or load-adaptive PFM series resonant inverter topologies. Conventional constant frequency phase-shifted inverters are widely used and evaluated for high power applications. But their soft-switching operations are not realized their operating frequency ranges are limited to around 20kHz. For the proposed load-adaptive PFM-based PWM control with lossless capacitors and loss less inductors, switching Iosses and stresses are much reduced and frequency limitation is extended more than 100kHz for IGBTs. These inverters are suitable for induction-heating applications in metal electroheat processing plants, food cooking processing plants, hot water and hot gas producing processing plants.

   Soft-Switched PWM High-Frequency Load-Resonant Inverter with Power Factor Correction for Induction Heating Cooking Appliance
By S. P. Wang; M. Nakaoka [View]
[Download]

Abstract: This paper presents a novel type of voltage-fed quasi-load resonant half-bridge IGBT inverter operating at constant frequency variable power (CFVP) regulation scheme which is more suitable and acceptable for new high-frequency high-power induction-heated (IH) cooking appliances. This application-specific high-frequency inverter using a new generation specially-designed IGBTs can efficiently operate under a principle of ZVS-PWM control strategy. The operating principle of a new inverter circuit is presented together with its power regulation characteristics on the basis of its computer-aided simulation analysis and its experimental results. The steady-state characteristics of cost effective quasi~resonant inverter developed for high-frequency IH cooking appliances such as multi-burner type IH cooker are discussed herein from a practical point of view.

   A Novel Resonant DC Link Multi-functional Three Phase PWM Converter for Battery Energy Storage System
By E. Hiraki; M. Kurokawa; S. Sugimoto; M. Nakaoka [View]
[Download]

Abstract: In this paper, a prototype of quasi-resonant DC link (QRDCL) voltage-fed bidirectional converter operating at Zero Voltage Soft-Switching PWM mode is presented for Battery Energy Storage System (BESS) . The operating principle of this QRDCL circuit and multi-functional control-based converter system, including PWM inverter mode in which energy flows through from the battery bank to the three phase utility-grid and an active PWM converter mode in which energy flows through from the utilitygrid to the battery bank are described The multi-functional operation characteristics of this three phase soft-switching ZVS-PWM bidirectional converter with QRDCL for BESS is demonstrated under the conditions of peak-cut mode and battery charging mode in comparison with three phase hard-switching PWM bidirectional converter for BESS, and its effectiveness is proved on the basis of the simulation analysis.

   DIGITAL PREDICITIVE CURRENT CONTROL OF QUASI RESONANT DC LINK INVERTER FED ASYNCHRONOUS MOTORS
By C. Attaianese; S. Meo; A. Perfetto [View]
[Download]

Abstract: In the paper, a digital predictive algorithm for c.ontrolling quasi resonant inverter (QRI) feeding induction machines is presented. As (QRI) is adopted a simple structure, which has a switch connected between de voltage source and resonant inductor. The proposed control algorithm is able to predict step by step the inverter state switching and to control inserted switch of the (QRI), according to induction motor control strategy.

   DESIGN OPTIMISATION OF AN ACTIVE CLAMP FORWARD CONVERTER
By P. J. Haigh; A. J. Forsyth [View]
[Download]

Abstract: The design and optimisation of a I 25W forward converter utilising an active clamp topology is examined. Standard forward converters are generally limited to a duty-ratio of 0.5 to allow for transformer reset. The use of the active clamp topology provides a method of increasing the duty ratio above 0.5, giving greater flexibility in the design of the transformer and choice of circuit components, giving the possibility of improving efficiency. A design optimisation procedure is devised and illustrated with practical results. The potential· improvements in efficiency are shown to be greatest for low voltage DC/DC converters.

EPE 1997 – 80: Dialogue Session DS2c: RESONANCE APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 80: Dialogue Session DS2c: RESONANCE APPLICATIONS
	[return to parent folder]

	IMPROVEMENT OF THE POWER FACTOR OF DIMMERS USING HIGH FREQUENCY ZERO CURRENT SWITCHING By K.-J. Lux; G. Schröder; H. Siebel; B. H. Yu	[View] [Download]
Abstract: With new EMI standards new converter structures and control methods are necessary. In the past usually phase control was the appropriate method for the control of simple ac loads (e.g. lamps). The disadvantage of phase control is generation of additional reactive power and of harmonics in the mains. The circuit proposed in this paper is able to reduce the harmonics in the mains significantly. Reactive power due to control is avoided. A enhanced version additionally avoids significant harmonics at the load side.

	NOVEL ZERO CURRENT SWITCHING HIGH FREQUENCY INVERTER APPLIED FOR AN EMISSION CONTROL IN DIESEL ENGINE By Y. Hatanaka; S. Kubota; Y. Seldya	[View] [Download]
Abstract: This paper presents a new circuit topology of a novel zero current switching ( ZCS) high frequency inverter for induction heating and ultrasonic transducer system applied for an emission control in diesel engine. The ZCS characteristics are numerically analyzed in connection with normalized frequency and load. On the basis of numerical analysis, the high frequency power supply has been designed and experimented.

	DESIGN OF A LCC RESONANT INVERTER FOR HIGH FREQUENCY LAMP BALLAST, RESONANT CURRENT CONTROLLED, WITH HIGH POWER FACTOR By F. Ferrero; M. Rico; J. Marcos; C. Blanco; E. Corominas; A. Calleja	[View] [Download]
Abstract: Analysis and design of a single-stage electronic ballast with unit power factor are presented in this paper. The proposed single-stage ballast is the combination of a boost converter and a full-bridge series-resonant parallel-loaded inverter. The boost semi-stage working in the discontinuous conduction mode functions as a power factor corrector and the inverter semi-stage operated above resonance is employed to the ballast lamp. The fundamental approximation is used to design the inverter at steady-state. A novel control method by resonant current allows to the bridge switches operating in points where the commutations are optimum and the reactive energy that the inverter handles is nil. The proposed lamp ballast can save a controller, reduce size and possibly increase system reliability over a conventional two-stage system. Experimental results from a lab prototype are used to verifY the design procedure.

	SELF-ADJUSTING RESONANT CONVERTERS AND APPLICATION BY HIGH POWER ELECTRICAL ARC FURNACES By K. Janson: J. Järvik	[View] [Download]
Abstract: When solving the problems of electric power quality converters with high power factor and low level of current distortion are useful. Resonant converters of 50 (60) Hz AC-DC are described, where each half-cycle of network voltage the capacitor and inductor of an oscillatory circuit are switched from series into parallel and vice versa. ]ne duration of series and parallel connection and also the transformer ratio arc parametrically dependent on load. 50 Hz oscillatory circuit restrict higher harmonics. Parallel oscillatory circuit restricts short circuit current. Making use ofthyristors or transistors is not necessary for supplying electrical arc with variable voltage. These converters are network-friendly, with high power factor and suitable for fluctuating loads. When used with arc furnaces they enable to manage without expensive dynamic compensators. The operating principle of the converters, arc furnaces voltage and current control and Power Supply ESTA characteristics are discussed.

	SOFT SWITCHING INVERTER POWER SOURCE FOR ARC WELDING By H. Mecke; W. Fischer; F. Werther	[View] [Download]
Abstract: Modem electronic power sources for arc welding are mostly based on tl1e inverter principle. The increase of switching frequency to about I 00 kHz is desirable for further improvement of control capabilities and to reduce dimensions and weight and can only be reached sufficiently with soft switched semiconductors. A new control method has been developed for the ZVZCS - PS - FB - converter considering the specific static and dynamic load conditions of arc welding. Simulation results and experimental verification give good operation conditions over the entire load range.

	A Novel Auxiliary Resonant Commutated Pole Inverter Topology with Zero Current Turn-off Switching By Min-Hong Kim; Yo-Han Lee Dong-Seok Hyun	[View] [Download]
Abstract: This paper proposes a novel Auxiliary Resonant Conunutated Pole Inverter (ARCPI) topology. Many investigations for resonant converters have been studied and reported. Auxiliary Resonant Commutated Pole Inverter (ARCPI) is one of the most successful circuit topologies. However, the conventional ARCPis have the switching property like the general PWM inverters with the capacitive snubbers at turn-off. Therefore, as the load current increases, the turn-off switching losses may be so serious and can be so much considerable. The proposed ARCPI solves this problem, which can achieve ZCS at tun1-off with high frequency transformers, switches, and capacitors. The analyses and the characteristics for each operation mode of the proposed circuit are described indetail and the validity is verified by the simulation and experimental results.

	IGBT Half-Bridge Inverter for Induction Heating Applications with Active Auxiliary Resonant Circuit By J. W. Jung; B. K. Lee; B. S. Suh; D. S. Hyun	[View] [Download]
Abstract: A New IGBT half-bridge inverter topology with active auxiliary resonant circuit (A 2RC) is proposed. The A2RC permits the large lossless turn-off snubber capacitor to be successfully used. Therefore, it makes IGBT be used efficiently in high power and high frequency induction heating system. The operation principle and the design procedures of the proposed A2RC are described in detail and the validity is verified by testing on a 55kHz IGBT half-bridge inverter for induction heating cooking system rated on 1.3kW.

	New Phase-Shifted Soft-Switching PWM Series Resonant Inverter Topologies and Their Practical Evaluations By Eiji Hiraki; Satoshi Nagai; Yasuhiro Arai; A. Chibani; Mutsuo Nakaoka	[View] [Download]
Abstract: This paper presents three versions of soft-switching phase-shifted PWM with constant frequency or load-adaptive PFM series resonant inverter topologies. Conventional constant frequency phase-shifted inverters are widely used and evaluated for high power applications. But their soft-switching operations are not realized their operating frequency ranges are limited to around 20kHz. For the proposed load-adaptive PFM-based PWM control with lossless capacitors and loss less inductors, switching Iosses and stresses are much reduced and frequency limitation is extended more than 100kHz for IGBTs. These inverters are suitable for induction-heating applications in metal electroheat processing plants, food cooking processing plants, hot water and hot gas producing processing plants.

	Soft-Switched PWM High-Frequency Load-Resonant Inverter with Power Factor Correction for Induction Heating Cooking Appliance By S. P. Wang; M. Nakaoka	[View] [Download]
Abstract: This paper presents a novel type of voltage-fed quasi-load resonant half-bridge IGBT inverter operating at constant frequency variable power (CFVP) regulation scheme which is more suitable and acceptable for new high-frequency high-power induction-heated (IH) cooking appliances. This application-specific high-frequency inverter using a new generation specially-designed IGBTs can efficiently operate under a principle of ZVS-PWM control strategy. The operating principle of a new inverter circuit is presented together with its power regulation characteristics on the basis of its computer-aided simulation analysis and its experimental results. The steady-state characteristics of cost effective quasi~resonant inverter developed for high-frequency IH cooking appliances such as multi-burner type IH cooker are discussed herein from a practical point of view.

	A Novel Resonant DC Link Multi-functional Three Phase PWM Converter for Battery Energy Storage System By E. Hiraki; M. Kurokawa; S. Sugimoto; M. Nakaoka	[View] [Download]
Abstract: In this paper, a prototype of quasi-resonant DC link (QRDCL) voltage-fed bidirectional converter operating at Zero Voltage Soft-Switching PWM mode is presented for Battery Energy Storage System (BESS) . The operating principle of this QRDCL circuit and multi-functional control-based converter system, including PWM inverter mode in which energy flows through from the battery bank to the three phase utility-grid and an active PWM converter mode in which energy flows through from the utilitygrid to the battery bank are described The multi-functional operation characteristics of this three phase soft-switching ZVS-PWM bidirectional converter with QRDCL for BESS is demonstrated under the conditions of peak-cut mode and battery charging mode in comparison with three phase hard-switching PWM bidirectional converter for BESS, and its effectiveness is proved on the basis of the simulation analysis.

	DIGITAL PREDICITIVE CURRENT CONTROL OF QUASI RESONANT DC LINK INVERTER FED ASYNCHRONOUS MOTORS By C. Attaianese; S. Meo; A. Perfetto	[View] [Download]
Abstract: In the paper, a digital predictive algorithm for c.ontrolling quasi resonant inverter (QRI) feeding induction machines is presented. As (QRI) is adopted a simple structure, which has a switch connected between de voltage source and resonant inductor. The proposed control algorithm is able to predict step by step the inverter state switching and to control inserted switch of the (QRI), according to induction motor control strategy.

	DESIGN OPTIMISATION OF AN ACTIVE CLAMP FORWARD CONVERTER By P. J. Haigh; A. J. Forsyth	[View] [Download]
Abstract: The design and optimisation of a I 25W forward converter utilising an active clamp topology is examined. Standard forward converters are generally limited to a duty-ratio of 0.5 to allow for transformer reset. The use of the active clamp topology provides a method of increasing the duty ratio above 0.5, giving greater flexibility in the design of the transformer and choice of circuit components, giving the possibility of improving efficiency. A design optimisation procedure is devised and illustrated with practical results. The potential· improvements in efficiency are shown to be greatest for low voltage DC/DC converters.