EPE Association: EPE 1997 – 81: Dialogue Session DS2d: RESONANCE 1

EPE 1997 – 81: Dialogue Session DS2d: RESONANCE 1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 81: Dialogue Session DS2d: RESONANCE 1

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   A CONTROL ANALYSIS AND CLOSED-LOOP DESIGN FOR SERIE-PARALLEL RESONANT CONVERTERS
By J. Laeuffer; E. Godoy; T. Planas; B. Lorcet; D. Sadarnac [View]
[Download]

Abstract: The use of multiple resonant converter is required to improve large dynamics characteristics; but the increase of resonant components number leads to control issues. This papers shows a general methodology for operating, variable sampling identification and control law of a multiple resonant converter. As an example, we show a study based on a LLC double resonant converter operating in ZCS mode. Characterization is followed by poles identification. Then, ·a closed-loop control is designed, based on the resonant components state feed-backs.

   FPGA BASED CONTROL OF AN ARCP-INVERTER WITHOUT ADDITIONAL SENSORS
By H.-G. Eckel; L. Sack; K. Rascher [View]
[Download]

Abstract: The auxiliary resonant commutated pole inverter (ARCPI) is one of the most promising resonant inverter topologies for high power drive applications. In this paper, a digital control circuit for the ARCPI is presented, which allows compensation of the resonant time and thereby leads to a load-independent control characteristic of the inverter. For dimensioning of the resonant elements, a compromise must be found between the peak value and theRMS value of the resonant current and the switching time. In this paper, equations are given for these quantities as functions of the voltage' rise time of the main switches and the current rise time of the auxiliary switches. The main problem with the ARCPI is the realization of the auxiliary switches. In this paper, different auxiliary switch topologies are proposed and analysed.

   A GENERALIZED SLIDING MODE CONTROLLER FOR HALF-WAVE QUANTUM RESONANT CONVERTERS
By M. Castilla; L. Garcia de Vicuna; M. López [View]
[Download]

Abstract: A generalized sliding mode controller which can be applied to half-wave quantum resonant converters is proposed. These converters operate at resonant frequency and provide zero-current switching conditions. Starting from a simple sliding surface, the sliding mode control theory is applied to an averaged large-signal model for these converters that allows to determine the main constraints of the controller parameters. The controller provides fast transient response, absence of steady-state errors in the output voltage and a robust output voltage response in relation to the input voltage and load disturbances.

   A FULL-BRIDGE SR-PWM DC-DC CONVERTER OPERATING AT REDUCED CONDUCTION AND COMMUTATION LOSSES USING PHASE-SHIFf CONTROL
By J. C. da Silva e Sousa; A. A. Pereira; L. C. de Freitas; V. J. Farias; J. B. Vieira Junior [View]
[Download]

Abstract: This paper presents a SR-PWM Full-Bridge DC-DC ·converter operating at reduced conduction and commutation losses and using phase-shift control. This converter employs a self-resonant circuit and a tapped inductor for minimizing a circulating current flowing through the transformer and switching devices. The principle of the self-resonant circuit provides the soft switching. It is based in an auxiliary voltage source that feeds the resonant circuit, charging a capacitor which provides the condition for zero voltage switching (ZVS) of the main switches. The proposed approach allows building a converter with high frequency of operation. A detailed analysis of the operation is presented. The output voltage is controlled by PWM. The complete theoretical analysis, operating principles, simulation and experimental results are presented.

   A HIGH-POWER-FACTOR BUCK CONVERTER WITH SOFT-SWITCHING OPERATION
By K. Taniguchi; T. Morizane; N.Kimura; Hyun-Woo Lee [View]
[Download]

Abstract: Soft-switched buck-type PWM converter is proposed in this paper. A discontinuous conduction mode converter eliminates the complicated circuit control requirement, reduces a number of components, and reduces the filter reactive components size. In the discontinuous mode converter, the device must be switched off at a maximum inductor current. To achieve the zero voltage switching, the proposed converter is constructed by using a loss-less snubber circuit. Soft-switched operation of the proposed PWM converter is verified by digital simulation and experimental results. A new PWM converter achieves the soft-switching for all switching devices without increasing their voltage and current stresses.

   THERMAL FAILURES ON A 2kW-100kHz IGBT-BASED DC-DC RESONANT CONVERTER
By Dario D'Amore [View]
[Download]

Abstract: Design of high reliability power converters needs to keep into account thermal effects. In this work the results of the electro-thermal analysis of a 2kW-100kHz IGBTbased DC-DC resonant converter performed during its design phase are here presented. The paralleled structure of these power devices, lead to a thermal behavior that can significantly differ from that of not paralleled ones. Simulation results exhibit how under some realistic circumstances, small defects during the packaging process and consequent irregularities in thermal coupling between elementary device's cell at the paralleled level can lead to hot spots that can destroy the power device.

   RELIABLE METHOD USED TO SIZE A MULTIRESONANT LCCL TYPE CONVERTER
By B. Dakyo; F. Lafitte; L. Protin [View]
[Download]

Abstract: We have proposed and studied a high power (12kW) multiresonant converter for a telecommunication equipement supply. Resonant converter is adopted for soft-switching benefits. The problems of theoretical analysis of such converter are tied to the modes multiplicity and to the knowledge of converter behaviour in frequency domain. We propose a relevant method of sizing based on an analytical approach and output current evaluation when the output voltage is assumed constant. This method takes in account transformer leakage inductance for a userdefined and switches dependant frequency range of operation.

   EVALUATION OF RESONANT CONVERTERS FOR INCREASED SOFTSWITCHING RANGE
By T. Melaa; A. K. Adnanes; K. 0ye; T. F. Nestli; Roy Nilsen; P. Ranstad [View]
[Download]

Abstract: An evaluation and comparison of resonant converter topologies with diode bridge and capacitive filter at the output is performed. A Series Load Resonant converter with switching frequencies below as well as above resonance frequency, is investigated. The Series Load lnductor converter is evaluated as well. Increasing the soft switching range by help of adding resonant poles are taken into consideration, as well as combinations of phase shift and frequency control. A new control metl10d for increasing the soft switching range is proposed.

   PREDICTING REAL CHARACTERISTICS OF BUCK-BOOST ZERO-VOLTAGE SWITCHING QUASI-RESONANT CONVERTERS
By N. P. Polyzos; E. C. Tatakis [View]
[Download]

Abstract: The behaviour of ZVS-QRCs, analyzed in previously published works, is based on the assumption of equal input and output energies. Nevertheless measurements on experimental circuits demonstrate an important deviation between the results of the theoretical analysis and the real behavioral characteristics of the converter. In this paper, a comparison between the ideal and the real characteristics of Buck-Boost ZVS-QRCs will be presented. The real characteristics are reproduced qualitatively by computer simulation, taking into account the losses in each converter element. For this purpose approximation formulas are used. The simulation results are confronted to measurements that were taken with different breadboarded Buck-Boost ZVS-QRCs. These experimental results are also discussed.

EPE 1997 – 81: Dialogue Session DS2d: RESONANCE 1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 81: Dialogue Session DS2d: RESONANCE 1
	[return to parent folder]

	A CONTROL ANALYSIS AND CLOSED-LOOP DESIGN FOR SERIE-PARALLEL RESONANT CONVERTERS By J. Laeuffer; E. Godoy; T. Planas; B. Lorcet; D. Sadarnac	[View] [Download]
Abstract: The use of multiple resonant converter is required to improve large dynamics characteristics; but the increase of resonant components number leads to control issues. This papers shows a general methodology for operating, variable sampling identification and control law of a multiple resonant converter. As an example, we show a study based on a LLC double resonant converter operating in ZCS mode. Characterization is followed by poles identification. Then, ·a closed-loop control is designed, based on the resonant components state feed-backs.

	FPGA BASED CONTROL OF AN ARCP-INVERTER WITHOUT ADDITIONAL SENSORS By H.-G. Eckel; L. Sack; K. Rascher	[View] [Download]
Abstract: The auxiliary resonant commutated pole inverter (ARCPI) is one of the most promising resonant inverter topologies for high power drive applications. In this paper, a digital control circuit for the ARCPI is presented, which allows compensation of the resonant time and thereby leads to a load-independent control characteristic of the inverter. For dimensioning of the resonant elements, a compromise must be found between the peak value and theRMS value of the resonant current and the switching time. In this paper, equations are given for these quantities as functions of the voltage' rise time of the main switches and the current rise time of the auxiliary switches. The main problem with the ARCPI is the realization of the auxiliary switches. In this paper, different auxiliary switch topologies are proposed and analysed.

	A GENERALIZED SLIDING MODE CONTROLLER FOR HALF-WAVE QUANTUM RESONANT CONVERTERS By M. Castilla; L. Garcia de Vicuna; M. López	[View] [Download]
Abstract: A generalized sliding mode controller which can be applied to half-wave quantum resonant converters is proposed. These converters operate at resonant frequency and provide zero-current switching conditions. Starting from a simple sliding surface, the sliding mode control theory is applied to an averaged large-signal model for these converters that allows to determine the main constraints of the controller parameters. The controller provides fast transient response, absence of steady-state errors in the output voltage and a robust output voltage response in relation to the input voltage and load disturbances.

	A FULL-BRIDGE SR-PWM DC-DC CONVERTER OPERATING AT REDUCED CONDUCTION AND COMMUTATION LOSSES USING PHASE-SHIFf CONTROL By J. C. da Silva e Sousa; A. A. Pereira; L. C. de Freitas; V. J. Farias; J. B. Vieira Junior	[View] [Download]
Abstract: This paper presents a SR-PWM Full-Bridge DC-DC ·converter operating at reduced conduction and commutation losses and using phase-shift control. This converter employs a self-resonant circuit and a tapped inductor for minimizing a circulating current flowing through the transformer and switching devices. The principle of the self-resonant circuit provides the soft switching. It is based in an auxiliary voltage source that feeds the resonant circuit, charging a capacitor which provides the condition for zero voltage switching (ZVS) of the main switches. The proposed approach allows building a converter with high frequency of operation. A detailed analysis of the operation is presented. The output voltage is controlled by PWM. The complete theoretical analysis, operating principles, simulation and experimental results are presented.

	A HIGH-POWER-FACTOR BUCK CONVERTER WITH SOFT-SWITCHING OPERATION By K. Taniguchi; T. Morizane; N.Kimura; Hyun-Woo Lee	[View] [Download]
Abstract: Soft-switched buck-type PWM converter is proposed in this paper. A discontinuous conduction mode converter eliminates the complicated circuit control requirement, reduces a number of components, and reduces the filter reactive components size. In the discontinuous mode converter, the device must be switched off at a maximum inductor current. To achieve the zero voltage switching, the proposed converter is constructed by using a loss-less snubber circuit. Soft-switched operation of the proposed PWM converter is verified by digital simulation and experimental results. A new PWM converter achieves the soft-switching for all switching devices without increasing their voltage and current stresses.

	THERMAL FAILURES ON A 2kW-100kHz IGBT-BASED DC-DC RESONANT CONVERTER By Dario D'Amore	[View] [Download]
Abstract: Design of high reliability power converters needs to keep into account thermal effects. In this work the results of the electro-thermal analysis of a 2kW-100kHz IGBTbased DC-DC resonant converter performed during its design phase are here presented. The paralleled structure of these power devices, lead to a thermal behavior that can significantly differ from that of not paralleled ones. Simulation results exhibit how under some realistic circumstances, small defects during the packaging process and consequent irregularities in thermal coupling between elementary device's cell at the paralleled level can lead to hot spots that can destroy the power device.

	RELIABLE METHOD USED TO SIZE A MULTIRESONANT LCCL TYPE CONVERTER By B. Dakyo; F. Lafitte; L. Protin	[View] [Download]
Abstract: We have proposed and studied a high power (12kW) multiresonant converter for a telecommunication equipement supply. Resonant converter is adopted for soft-switching benefits. The problems of theoretical analysis of such converter are tied to the modes multiplicity and to the knowledge of converter behaviour in frequency domain. We propose a relevant method of sizing based on an analytical approach and output current evaluation when the output voltage is assumed constant. This method takes in account transformer leakage inductance for a userdefined and switches dependant frequency range of operation.

	EVALUATION OF RESONANT CONVERTERS FOR INCREASED SOFTSWITCHING RANGE By T. Melaa; A. K. Adnanes; K. 0ye; T. F. Nestli; Roy Nilsen; P. Ranstad	[View] [Download]
Abstract: An evaluation and comparison of resonant converter topologies with diode bridge and capacitive filter at the output is performed. A Series Load Resonant converter with switching frequencies below as well as above resonance frequency, is investigated. The Series Load lnductor converter is evaluated as well. Increasing the soft switching range by help of adding resonant poles are taken into consideration, as well as combinations of phase shift and frequency control. A new control metl10d for increasing the soft switching range is proposed.

	PREDICTING REAL CHARACTERISTICS OF BUCK-BOOST ZERO-VOLTAGE SWITCHING QUASI-RESONANT CONVERTERS By N. P. Polyzos; E. C. Tatakis	[View] [Download]
Abstract: The behaviour of ZVS-QRCs, analyzed in previously published works, is based on the assumption of equal input and output energies. Nevertheless measurements on experimental circuits demonstrate an important deviation between the results of the theoretical analysis and the real behavioral characteristics of the converter. In this paper, a comparison between the ideal and the real characteristics of Buck-Boost ZVS-QRCs will be presented. The real characteristics are reproduced qualitatively by computer simulation, taking into account the losses in each converter element. For this purpose approximation formulas are used. The simulation results are confronted to measurements that were taken with different breadboarded Buck-Boost ZVS-QRCs. These experimental results are also discussed.