EPE Association: EPE 1995 - 13 - Lecture Session L4a: HIGH EFFICIENCY CONVERTERS

EPE 1995 - 13 - Lecture Session L4a: HIGH EFFICIENCY CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 13 - Lecture Session L4a: HIGH EFFICIENCY CONVERTERS

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   NOVEL SOFT SWITCHING QUASI RESONANT 3-PHASE IGBT INVERTER
By S. Salama; Y. Tadros [View]
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Abstract: This paper presents a novel soft switching quasi resonant 3-phase IGBT inverter capable of operating at high switching frequency for high power applications (up to 100 kW). The circuit enables zero voltage switching with reduced device stresses for all switches. It provides reduced voltage rate of change du/dt and hence low conducted and radiated emission. The proposed inverter utilizes an auxiliary zero voltage switching circuit (ZVS) which can be triggered on demand, to create a zero-voltage switching interval for the inverter switches, thereby ensuring nearly loss less switching. A simple control scheme of the clamp voltage is introduced to ensure the operation of the circuit under variable load conditions. Experimental results from a 50 kVA, 400 V inverter for 3-phase load verified the expected advantages of the novel inverter concerning the switching frequency and du/dt stresses. The paper concludes with detailed comparison to the conventional hard switching 3-phase PWM IGBT inverter.

   A NEW DOUBLE RESONANT ZERO CURRENT SWITCHING MATRIX CONVERTER
By M. Marcks [View]
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Abstract: Existing topologies of matrix converters are analysed and their remaining problems are pointed out. The load current commutation is analyzed and solutions are discussed. A new zero current switching matrix converter is proposed and its benefits refered to easy current commutation and low switching losses are emphasized. A control with adjustable power factor at line and load end of the proposed converter by means of space vectors is described. The feasability of the whole system is verified by means of numerical simulation. The resonant networks are improved and extended to double resonant networks to reduce the r.m.s. current through the switches and therewith conduction losses while using zero current switching.

   HIGH FREQUENCY HIGH EFFICIENCY DC/DC CONVERTERS
By L. de la Torre [View]
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Abstract: Telecommunication equipments use extensively distributed power supply systems. In consequence power converter design becomes critical for determining system performance. As electronic systems grow in complexity, demanding for higher power and smaller sizes, they need increasing power density converters. This paper presents a new circuit structure for high power density, high efficiency DC/DC converters operating at high frequency with minimum switching losses. Resonant reset allows to increase the converter operating frequency by a factor of 4 without increasing substantially conmutation losses. These technics have become the basis for the development of a 60 W, 5 V output converter with very high efficiency.

   A 20 kVA AUXILIARY RESONANT COMMUTATED POLE CONVERTER - DESIGN AND PRACTICAL EXPERIENCES-ERIENCES -
By F.-F. Protiwa; J. Koss [View]
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Abstract: Standard hard switched PWM-inverters show high switching losses and EMC problems due to their steep voltage transients. Resonant Converters can overcome some of these problems. One of the most promising topologies - the Auxiliary Resonant Commutated Pole Inverter (ARCPI) - has been investigated. This converter reduces the switching losses between seven and tenfold. It also combines low EMI with true PWM-control. No increase in primary device voltage or current ratings of the main switches can be observed. Two additional auxiliary switches, one inductor and two small capacitors per phase are necessary to build an ARCPI.

EPE 1995 - 13 - Lecture Session L4a: HIGH EFFICIENCY CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 13 - Lecture Session L4a: HIGH EFFICIENCY CONVERTERS
	[return to parent folder]

	NOVEL SOFT SWITCHING QUASI RESONANT 3-PHASE IGBT INVERTER By S. Salama; Y. Tadros	[View] [Download]
Abstract: This paper presents a novel soft switching quasi resonant 3-phase IGBT inverter capable of operating at high switching frequency for high power applications (up to 100 kW). The circuit enables zero voltage switching with reduced device stresses for all switches. It provides reduced voltage rate of change du/dt and hence low conducted and radiated emission. The proposed inverter utilizes an auxiliary zero voltage switching circuit (ZVS) which can be triggered on demand, to create a zero-voltage switching interval for the inverter switches, thereby ensuring nearly loss less switching. A simple control scheme of the clamp voltage is introduced to ensure the operation of the circuit under variable load conditions. Experimental results from a 50 kVA, 400 V inverter for 3-phase load verified the expected advantages of the novel inverter concerning the switching frequency and du/dt stresses. The paper concludes with detailed comparison to the conventional hard switching 3-phase PWM IGBT inverter.

	A NEW DOUBLE RESONANT ZERO CURRENT SWITCHING MATRIX CONVERTER By M. Marcks	[View] [Download]
Abstract: Existing topologies of matrix converters are analysed and their remaining problems are pointed out. The load current commutation is analyzed and solutions are discussed. A new zero current switching matrix converter is proposed and its benefits refered to easy current commutation and low switching losses are emphasized. A control with adjustable power factor at line and load end of the proposed converter by means of space vectors is described. The feasability of the whole system is verified by means of numerical simulation. The resonant networks are improved and extended to double resonant networks to reduce the r.m.s. current through the switches and therewith conduction losses while using zero current switching.

	HIGH FREQUENCY HIGH EFFICIENCY DC/DC CONVERTERS By L. de la Torre	[View] [Download]
Abstract: Telecommunication equipments use extensively distributed power supply systems. In consequence power converter design becomes critical for determining system performance. As electronic systems grow in complexity, demanding for higher power and smaller sizes, they need increasing power density converters. This paper presents a new circuit structure for high power density, high efficiency DC/DC converters operating at high frequency with minimum switching losses. Resonant reset allows to increase the converter operating frequency by a factor of 4 without increasing substantially conmutation losses. These technics have become the basis for the development of a 60 W, 5 V output converter with very high efficiency.

	A 20 kVA AUXILIARY RESONANT COMMUTATED POLE CONVERTER - DESIGN AND PRACTICAL EXPERIENCES-ERIENCES - By F.-F. Protiwa; J. Koss	[View] [Download]
Abstract: Standard hard switched PWM-inverters show high switching losses and EMC problems due to their steep voltage transients. Resonant Converters can overcome some of these problems. One of the most promising topologies - the Auxiliary Resonant Commutated Pole Inverter (ARCPI) - has been investigated. This converter reduces the switching losses between seven and tenfold. It also combines low EMI with true PWM-control. No increase in primary device voltage or current ratings of the main switches can be observed. Two additional auxiliary switches, one inductor and two small capacitors per phase are necessary to build an ARCPI.