EPE Association: EPE 1997 – 20: Lecture Session L5d: RESONANT CONVERTERS

EPE 1997 – 20: Lecture Session L5d: RESONANT CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 20: Lecture Session L5d: RESONANT CONVERTERS

   [return to parent folder]

   A SINGLE-PHASE/THREE-PHASE COMPATIBLE - SOFT-SWITCHED AC-TO-DC CONVERTER
By J.Y. Choi; H.S. Mok; T.Y.Kim; J.G. Cho; G.S. Kim; U.Y. Huh [View]
[Download]

Abstract: A highly efficient single-phase/three-phase compatible ac-to-de converter is proposed and analyzed, which includes three identical single-phase both soft-switched de-to-de converter with boost converter as a pre-regulator for input power factor correction (PFC). The proposed converter structure provides a cost reduction and easy implementation of compatibility between single-phase 220v and three-phase 220v/380v with their inputs in delta or wye connections.

   AN EFFICIENCY STUDY OF A ROBUST AND SIMPLE THREE PHASE RESONANT CONVERTER
By Stig Munk-Nielsen; Frede Blaabjerg; John K. Pedersen [View]
[Download]

Abstract: This paper presents measurements on a 5 kW three phase resonant converter. The operation of the resonant converter is described highlighting a new method of maintaining the resonance of the resonant circuit. It is named non-short circuit method. Using the non-short circuit method a robust three phase resonant converter operation is possible, and it improves the voltage limiting ability of a recently proposed link voltage peak control scheme. It is described how the control ofthe link voltage peak is possible by appropriate timing of the converter switching. The strategy is named voltage peak control (VPC). The advantage of VPC is that no additional clamp circuit is required, but there are introduced a number of non-zero inverter switching instants at low voltage. A separate measurement of losses in rectifier, resonant link, inverter and load is carried out. The VPC control influence on the converter losses is presented, the converter test setup was able to load the converter with 3.8 kW, an efficiency of 97.2 % was measured.

   INVESTIGATION ON POWER FACTOR CORRECTION OF CURRENT-SOURCE RESONANT CONVERTER WITH TWO ENERGY STORAGE ELEMENTS
By H. Benquassmi;, J.-P. Ferrieux; B. Chauchat [View]
[Download]

Abstract: The aim of this paper is to investigate current-driven resonant converter which comply the following conditions: power factor correction, output voltage regulation, electrical insulation, high efficiency. The range of power is fixed to 3 kW. In this study we are interested in current-source resonant converter topologies with two energy storage elements which allow the leakage inductance of HF transformer to be used in order to achieve smaller size and lighter weight. Depending on the resonant circuit, power factor correction capability will be discussed. Converter topologies will be classified based on the switching category (zero-current or zero-voltage switching) and output filter type. Computer simulations will be given.

   CHARACTERISATION AND COMPARISON OF IGBTS AND MCTS IN ZERO CURRENT SWITCHING CONVERTERS
By S. Bernet [View]
[Download]

Abstract: The paper derives the stress of Zero Current Switches applying a simple equivalent commutation circuit. Simulations and measurements arc used to investigate the behavior of IGBTs and MCfs as Zero Current Switches. It is shown that available PT-IGBTs generate distinctly lower switching losses than comparable NPT-IGBTs in zero current switching applications. If the adherence of small hold-off times can be guaranteed the MCT is an outstanding Zero Current Switch. Potential applications of zero current switching converters with PT-IGBTs, NPT-IGBTs and MCTs arc derived.

EPE 1997 – 20: Lecture Session L5d: RESONANT CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 20: Lecture Session L5d: RESONANT CONVERTERS
	[return to parent folder]

	A SINGLE-PHASE/THREE-PHASE COMPATIBLE - SOFT-SWITCHED AC-TO-DC CONVERTER By J.Y. Choi; H.S. Mok; T.Y.Kim; J.G. Cho; G.S. Kim; U.Y. Huh	[View] [Download]
Abstract: A highly efficient single-phase/three-phase compatible ac-to-de converter is proposed and analyzed, which includes three identical single-phase both soft-switched de-to-de converter with boost converter as a pre-regulator for input power factor correction (PFC). The proposed converter structure provides a cost reduction and easy implementation of compatibility between single-phase 220v and three-phase 220v/380v with their inputs in delta or wye connections.

	AN EFFICIENCY STUDY OF A ROBUST AND SIMPLE THREE PHASE RESONANT CONVERTER By Stig Munk-Nielsen; Frede Blaabjerg; John K. Pedersen	[View] [Download]
Abstract: This paper presents measurements on a 5 kW three phase resonant converter. The operation of the resonant converter is described highlighting a new method of maintaining the resonance of the resonant circuit. It is named non-short circuit method. Using the non-short circuit method a robust three phase resonant converter operation is possible, and it improves the voltage limiting ability of a recently proposed link voltage peak control scheme. It is described how the control ofthe link voltage peak is possible by appropriate timing of the converter switching. The strategy is named voltage peak control (VPC). The advantage of VPC is that no additional clamp circuit is required, but there are introduced a number of non-zero inverter switching instants at low voltage. A separate measurement of losses in rectifier, resonant link, inverter and load is carried out. The VPC control influence on the converter losses is presented, the converter test setup was able to load the converter with 3.8 kW, an efficiency of 97.2 % was measured.

	INVESTIGATION ON POWER FACTOR CORRECTION OF CURRENT-SOURCE RESONANT CONVERTER WITH TWO ENERGY STORAGE ELEMENTS By H. Benquassmi;, J.-P. Ferrieux; B. Chauchat	[View] [Download]
Abstract: The aim of this paper is to investigate current-driven resonant converter which comply the following conditions: power factor correction, output voltage regulation, electrical insulation, high efficiency. The range of power is fixed to 3 kW. In this study we are interested in current-source resonant converter topologies with two energy storage elements which allow the leakage inductance of HF transformer to be used in order to achieve smaller size and lighter weight. Depending on the resonant circuit, power factor correction capability will be discussed. Converter topologies will be classified based on the switching category (zero-current or zero-voltage switching) and output filter type. Computer simulations will be given.

	CHARACTERISATION AND COMPARISON OF IGBTS AND MCTS IN ZERO CURRENT SWITCHING CONVERTERS By S. Bernet	[View] [Download]
Abstract: The paper derives the stress of Zero Current Switches applying a simple equivalent commutation circuit. Simulations and measurements arc used to investigate the behavior of IGBTs and MCfs as Zero Current Switches. It is shown that available PT-IGBTs generate distinctly lower switching losses than comparable NPT-IGBTs in zero current switching applications. If the adherence of small hold-off times can be guaranteed the MCT is an outstanding Zero Current Switch. Potential applications of zero current switching converters with PT-IGBTs, NPT-IGBTs and MCTs arc derived.