EPE Association: EPE 1987 - 09 - Lecture Session 1.09: RESONANT CONVERTERS

EPE 1987 - 09 - Lecture Session 1.09: RESONANT CONVERTERS
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   A FORMALISTIC APPROACH TO SERIES-RESONANT POWER CONVERSION
By Sjoerd W. H. de Haan; Johannes D. Lodder [View]
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Abstract: The way of operation of multiphase series-resonant converters is looked at from two viewpoints: from the requirements as imposed by the resonant circuit and from the requirements as imposed by the desired power transfer characteristic. The viewpoints are unified in a straightforward switch selection proces. Basic constraints are stated and therefrom effective switching schemes are derived. The switching schemes are demonstrated by way of simulation of a 3 phase to 3 phase series-resonant converter. This converter is characterized by bilateral power flow, variable frequency, both voltage step-up or step-down and independent control of reactive power on both input and output.

   GENERALIZATION OF THE RESONANT SWITCH CONCEPT STRUCTURES AND PERFORMANCES
By T. A. Meynard; Y. Cheron; H. Foch [View]
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Abstract: High frequency power conversion and substantial reduction of the switching losses are more and more often achieved with resonant converters. But, even with a single switch, there are many possible topologies and a proper choice requires careful analysis. To guide this analysis the concept of resonant switch is used and even generalized (twenty different switches are listed). By regrouping them according to various criterions (commutation mechanism, duality,...), a structured study of these resonant switches is achieved. Using these switches in the well-known buck converter, the authors show up the most important characteristics of each group of switches: working limits, current and voltage constraints, voltage conversion ratio,... Attractive topologies are finally selected and more deeply studied.

   REGULATED SELF-OSCILLATING RESONANT CONVERTERS
By J. Sebastian; M. Rico; J. Uceda; F. Aldana [View]
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Abstract: This paper presents a new type of regulated resonant converters. These new converters combine the advantages of resonant converters (i.e. high frequency operation, low losses, low EMI levels) and those ones of the saturating core transformer converters (few components, simplicity). The output voltage regulation is achieved by using a small magnetic amplifier. VCO and drive circuits and their power supply are not necessary in this new converter. A prototype of dc-to-dc converter has been built and tested.

   THE CASCODE SWITCH IN SERIES-RESONANT INVERTERS
By D. Lafore; D. Delage [View]
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Abstract: This paper deals with the special reaction of cascode switches in voltage inverters. The "self limiting lock-on conduction time" behavior is developed for a control mode without dead time. A simple drive circuit for a series-resonant converter using the self-limiting performance of cascode switches is given and introduces the "self piloting" possibility, for these converters, by the load. Finally, we present the results on a "self piloting" series-resonant converter, working with a time constant of half the resonance period of the load. These results enable us to design H.F. converters of power in excess of 10 KW and 100 to 300 KHz frequencies.

EPE 1987 - 09 - Lecture Session 1.09: RESONANT CONVERTERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 09 - Lecture Session 1.09: RESONANT CONVERTERS
	[return to parent folder]

	A FORMALISTIC APPROACH TO SERIES-RESONANT POWER CONVERSION By Sjoerd W. H. de Haan; Johannes D. Lodder	[View] [Download]
Abstract: The way of operation of multiphase series-resonant converters is looked at from two viewpoints: from the requirements as imposed by the resonant circuit and from the requirements as imposed by the desired power transfer characteristic. The viewpoints are unified in a straightforward switch selection proces. Basic constraints are stated and therefrom effective switching schemes are derived. The switching schemes are demonstrated by way of simulation of a 3 phase to 3 phase series-resonant converter. This converter is characterized by bilateral power flow, variable frequency, both voltage step-up or step-down and independent control of reactive power on both input and output.

	GENERALIZATION OF THE RESONANT SWITCH CONCEPT STRUCTURES AND PERFORMANCES By T. A. Meynard; Y. Cheron; H. Foch	[View] [Download]
Abstract: High frequency power conversion and substantial reduction of the switching losses are more and more often achieved with resonant converters. But, even with a single switch, there are many possible topologies and a proper choice requires careful analysis. To guide this analysis the concept of resonant switch is used and even generalized (twenty different switches are listed). By regrouping them according to various criterions (commutation mechanism, duality,...), a structured study of these resonant switches is achieved. Using these switches in the well-known buck converter, the authors show up the most important characteristics of each group of switches: working limits, current and voltage constraints, voltage conversion ratio,... Attractive topologies are finally selected and more deeply studied.

	REGULATED SELF-OSCILLATING RESONANT CONVERTERS By J. Sebastian; M. Rico; J. Uceda; F. Aldana	[View] [Download]
Abstract: This paper presents a new type of regulated resonant converters. These new converters combine the advantages of resonant converters (i.e. high frequency operation, low losses, low EMI levels) and those ones of the saturating core transformer converters (few components, simplicity). The output voltage regulation is achieved by using a small magnetic amplifier. VCO and drive circuits and their power supply are not necessary in this new converter. A prototype of dc-to-dc converter has been built and tested.

	THE CASCODE SWITCH IN SERIES-RESONANT INVERTERS By D. Lafore; D. Delage	[View] [Download]
Abstract: This paper deals with the special reaction of cascode switches in voltage inverters. The "self limiting lock-on conduction time" behavior is developed for a control mode without dead time. A simple drive circuit for a series-resonant converter using the self-limiting performance of cascode switches is given and introduces the "self piloting" possibility, for these converters, by the load. Finally, we present the results on a "self piloting" series-resonant converter, working with a time constant of half the resonance period of the load. These results enable us to design H.F. converters of power in excess of 10 KW and 100 to 300 KHz frequencies.