EPE Association: EPE 1991 - 12 - Session 2.1: RESONANT CONVERTERS

EPE 1991 - 12 - Session 2.1: RESONANT CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 12 - Session 2.1: RESONANT CONVERTERS

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   INTERACTION BETWEEN A SERIES-RESONANT CONVERTER AND A TRANSFORMER
By J. B. Klaassens; H. W. Klesser; M. P. N. van Wesenbeeck; K. van der Wint [View]
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Abstract: The paper demonstrates the existence of a number of transformer-induced low-frequency oscillations (TLO) which can be observed in the series-resonant power converter with a transformer integrated in the resonant circuit. The modes of operation under conditions of cyclic stability are explained for TLOs at both the primary side and the secondary side of the transformer. The TLO phenomena cause various problems , e.g. the instability of the waveforms, saturation of the transformer and reduction of the power capacity . The paper will also present a practical solution to overcome the indicated problems for series-resonant converters with an integrated transformer. The results of simulation and experimental observation confirm the existence of the TLOs .

   CURRENT PEAK LIMITING FOR A SERIES RESONANT DC LINK POWER CONVERSION USING A SATURABLE CORE
By Y. Murai; S. G. Abeyratne; T. A. Lipo; P. Caldeira [View]
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Abstract: High frequency resonant dc link power conversion circuits often experience irregular high peak current pulses during three phase operation and the pulses rise to over twice the regular pulse amplitude giving rise to current or voltage fluctuations at the output side. This high peak current/voltage problem appears to be common to both series/parallel resonant types respectively because of duality of the systems. In this paper current peak limiting has been performed by means of a saturable core inserted in the DC link as the resonant inductance. A simplified circuit limiting peak current is proposed and the resulting performance of the system is investigated by digital simulation.

   COMPARATIVE EVALUATION OF SOFT SWITCHING INVERTER TOPOLOGIES
By Deepak M. Divan; Giri Venkataramanan [View]
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Abstract: There has been a proliferation in recent years of inverter topologies which feature low switching loss, thus permitting high switching frequencies. Typical examples include resonant dc link inverters, resonant pole inverters, auxiliary resonant commutated pole inverters and many variations thereof. This paper presents a comparison of the various topologies based on important factors such as cost, component stresses, and spectral performance. Comparisons to conventional hard switching pwm inverters are also made. Limitations of individual circuits, in particular, the ability to realize goals of high switching frequency and low loss are also addressed in detail.

   A RELIABLE MOS TRANSISTOR DRIVER INTENDED FOR A SERIES RESONANT CONVERTER IN ZERO VOLTAGE SWITCHING MODE
By P. Cussac; P. Thomas; T. Fontenit; Y. Cheron; J. Roux [View]
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Abstract: In voltage inverter legs operating at high frequency, and especially in resonant inverters, the type of control and the commutation mecanisms have a strong influence on the control of the power transferred to the load and on the stress imposed on the switches. In the first part of the paper the different modes of operation of a voltage inverter leg are recalled and an analysis of the pros and cons of the utilization of the MOS transistors in each case is exposed. Then, a new control law allowing extended operating area, in particular no-load and unity power factor operation, while keeping the advantages of the Dual Thyristor operation (-ZVS) is proposed. This study is validated by means of a 5kW prototype using MOS transistors operating beyond 150kHz.

   Hardware Implementation and Experimental Evaluation of the Resonant Boost Rectifier
By R. W. De Doncker; G. A. Luckjiff; C. G. Hochgraf [View]
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Abstract: The hardware realizatlon of a single phase ac to three phase ac converter wlth unity power factor resonant boost line conditioner Is presented. The converter consists of a boost rectifier line connected to a resonant dc link bus and loaded by a three-phase bridge lnverter. The required gating circuitry for turn-off control of the damp switch dc link resonator and boost switch current modulator are detailed. Included are novel analog techniques for zero derivative detection, zero voltage crossing detection, and PWM modulation of ac line current for a resonant link. Experimental results illustrating the high performance of the circuit are included.

   NOVEL FULL-BRIDGE ZERO-CURRENT-SWITCHED PWM CONVERTER
By Guichao Hua; Fred C. Lee [View]
[Download]

Abstract: A novel full-bridge, zero-current-switched (ZCS), pulse-width-modulated (PWM) converter is proposed. The new circuit features the merits of the conventional PWM and ZCS quasi-resonant converter techniques while avoiding their respective limitations. The active switches in this converter operate with zero-current switching and the rectifier diodes with zero-voltage switching. Switching losses are significantly reduced at the expense of a limited increase in conduction loss. A detailed analysis of the proposed converter is presented and is verified on an 80 kHz, 200W experimental circuit using IGBTs.

EPE 1991 - 12 - Session 2.1: RESONANT CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 12 - Session 2.1: RESONANT CONVERTERS
	[return to parent folder]

	INTERACTION BETWEEN A SERIES-RESONANT CONVERTER AND A TRANSFORMER By J. B. Klaassens; H. W. Klesser; M. P. N. van Wesenbeeck; K. van der Wint	[View] [Download]
Abstract: The paper demonstrates the existence of a number of transformer-induced low-frequency oscillations (TLO) which can be observed in the series-resonant power converter with a transformer integrated in the resonant circuit. The modes of operation under conditions of cyclic stability are explained for TLOs at both the primary side and the secondary side of the transformer. The TLO phenomena cause various problems , e.g. the instability of the waveforms, saturation of the transformer and reduction of the power capacity . The paper will also present a practical solution to overcome the indicated problems for series-resonant converters with an integrated transformer. The results of simulation and experimental observation confirm the existence of the TLOs .

	CURRENT PEAK LIMITING FOR A SERIES RESONANT DC LINK POWER CONVERSION USING A SATURABLE CORE By Y. Murai; S. G. Abeyratne; T. A. Lipo; P. Caldeira	[View] [Download]
Abstract: High frequency resonant dc link power conversion circuits often experience irregular high peak current pulses during three phase operation and the pulses rise to over twice the regular pulse amplitude giving rise to current or voltage fluctuations at the output side. This high peak current/voltage problem appears to be common to both series/parallel resonant types respectively because of duality of the systems. In this paper current peak limiting has been performed by means of a saturable core inserted in the DC link as the resonant inductance. A simplified circuit limiting peak current is proposed and the resulting performance of the system is investigated by digital simulation.

	COMPARATIVE EVALUATION OF SOFT SWITCHING INVERTER TOPOLOGIES By Deepak M. Divan; Giri Venkataramanan	[View] [Download]
Abstract: There has been a proliferation in recent years of inverter topologies which feature low switching loss, thus permitting high switching frequencies. Typical examples include resonant dc link inverters, resonant pole inverters, auxiliary resonant commutated pole inverters and many variations thereof. This paper presents a comparison of the various topologies based on important factors such as cost, component stresses, and spectral performance. Comparisons to conventional hard switching pwm inverters are also made. Limitations of individual circuits, in particular, the ability to realize goals of high switching frequency and low loss are also addressed in detail.

	A RELIABLE MOS TRANSISTOR DRIVER INTENDED FOR A SERIES RESONANT CONVERTER IN ZERO VOLTAGE SWITCHING MODE By P. Cussac; P. Thomas; T. Fontenit; Y. Cheron; J. Roux	[View] [Download]
Abstract: In voltage inverter legs operating at high frequency, and especially in resonant inverters, the type of control and the commutation mecanisms have a strong influence on the control of the power transferred to the load and on the stress imposed on the switches. In the first part of the paper the different modes of operation of a voltage inverter leg are recalled and an analysis of the pros and cons of the utilization of the MOS transistors in each case is exposed. Then, a new control law allowing extended operating area, in particular no-load and unity power factor operation, while keeping the advantages of the Dual Thyristor operation (-ZVS) is proposed. This study is validated by means of a 5kW prototype using MOS transistors operating beyond 150kHz.

	Hardware Implementation and Experimental Evaluation of the Resonant Boost Rectifier By R. W. De Doncker; G. A. Luckjiff; C. G. Hochgraf	[View] [Download]
Abstract: The hardware realizatlon of a single phase ac to three phase ac converter wlth unity power factor resonant boost line conditioner Is presented. The converter consists of a boost rectifier line connected to a resonant dc link bus and loaded by a three-phase bridge lnverter. The required gating circuitry for turn-off control of the damp switch dc link resonator and boost switch current modulator are detailed. Included are novel analog techniques for zero derivative detection, zero voltage crossing detection, and PWM modulation of ac line current for a resonant link. Experimental results illustrating the high performance of the circuit are included.

	NOVEL FULL-BRIDGE ZERO-CURRENT-SWITCHED PWM CONVERTER By Guichao Hua; Fred C. Lee	[View] [Download]
Abstract: A novel full-bridge, zero-current-switched (ZCS), pulse-width-modulated (PWM) converter is proposed. The new circuit features the merits of the conventional PWM and ZCS quasi-resonant converter techniques while avoiding their respective limitations. The active switches in this converter operate with zero-current switching and the rectifier diodes with zero-voltage switching. Switching losses are significantly reduced at the expense of a limited increase in conduction loss. A detailed analysis of the proposed converter is presented and is verified on an 80 kHz, 200W experimental circuit using IGBTs.