EPE Association: EPE 2007 - Subtopic 04-1 - LS: Soft switching converters: resonant, ZVS, ZCS

EPE 2007 - Subtopic 04-1 - LS: Soft switching converters: resonant, ZVS, ZCS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 04: 'Soft switching converters and control' > EPE 2007 - Subtopic 04-1 - LS: Soft switching converters: resonant, ZVS, ZCS

   [return to parent folder]

   Three Phase Current Source Auxiliary Resonant Commutated Pole Inverter using IGBTs
By W.-R. Canders; N. Lescow; F. Hinrichsen [View]
[Download]

Abstract: To reduce the losses of power inverters, resonant topologies replace hard switching power inverters. This paper shows the first investigations and measurements carried out to design a three phase current link power inverter in ARCP (Auxiliary Resonant Commutated Pole) topology as well as the finally measurements and results achieved with the complete system.

   Comparison of single-phase matrix converter and H-bridge converter for radio
By N. Nguyen-Quang; D.A. Stone; C.M. Bingham; M.P. Foster [View]
[Download]

Abstract: This paper compares the newly developed single-phase matrix converter and the more conventional Hbridge converter for radio frequency induction heating. Both the converters exhibit unity power factor, very low total harmonic distortion at the utility supply interface, good controllability under soft switching condition for a wide range of power, and high efficiencies, whilst still having simple structures. A novel switching control pattern has been proposed for the matrix converter in order to maintain the comparable performance to the H-bridge converter. Simulation and experimental results for both converters are presented. Comparisons between two converters have confirmed the excellent performance of the proposed matrix converter.

   Wide input Voltage range Compensation in DC/DC Resonant Architecture for On-Board Traction Power Supplies
By A. Coccia; F. Canales; P. Barbosa; S. Ponnaluri [View]
[Download]

Abstract: Several methods to reduce the effect of wide input voltage variation in soft-switched DC/DC converters for high-power and high-voltage traction applications are presented in this paper. To enhance high conversion efficiency together with high reliability and cost reduction, the document addresses the use of a power architecture whose front-end is a three-level half-bridge converter non standard NPC configuration. Thanks to a structured control methodology based on the possibility to use either a two-level or a three-level modulation strategy according to the input voltage level, it is possible to optimize the converter performance over the whole input voltage range. First, the soft-switching implementation of the converter which allows ZVS operation in the entire load range by using the magnetizing inductance of the transformer is discussed. Then, the operation of the converter at both two-level and three-level operation is addressed. Concluding, experimental results obtained in the specified input voltage range are presented to confirm the validity of the theoretical analysis.

   A Novel Soft-Switching Bridgeless Power Factor Correction Circuit
By Hsien-Yi Tsai; Tsun-Hsiao Hsia; Dan Chen [View]
[Download]

Abstract: A novel zero- voltage- transition (ZVT) bridgeless power factor correction circuit (PFC) was proposed. An auxiliary circuit, consisting of a resonant inductor, two blocking diodes, one wheeling diode and an assist MOSFET, was used to reduce the turn-on switching loss of the two main switches of the bridgeless PFC circuit. Soft commutation of the main switches is achieved without imposing additional voltage stress on the main switches. Feedback gate-drive signals were obtained by using existing converter IC controller. In this paper, a detailed description of the operation of the proposed circuit will be given. Based on the analysis, guidelines for the component selection are presented. A prototype of 100-kHz, 600-W, universal-line PFC bridgeless circuit was built to verify the proposed scheme.

   Power factor control of the LCC current-output resonant converter
By A. J. Gilbert; C. M. Bingham; D. A. Stone; M. P. Foster [View]
[Download]

Abstract: An improved control strategy for LCC current-output resonant converters is proposed. Small/largesignal converter models and the steady-state dynamics of the converter are used for controlling powerfactor. The proposed method provides a convenient, linear control mechanism for the design of regulators, which has a similar influence to varying the DC-link supply voltage in terms of outputvoltage/ current control, which, whilst being desirable, is normally not a realistic proposition for commercial supplies.

   Design of an LCC current-output resonant converter for use as a constant current source
By A. J. Gilbert; D. A. Stone; C. M. Bingham; M. P. Foster [View]
[Download]

Abstract: A methodology for the design of LCC resonant current-source converters, is presented. Unlike previous techniques, the resulting converter provides near constant steady-state output current over an extended load range when excited at the resonant frequency, through use of a self-oscillating controller.

   Comparison of Methods for the Analysis of the Parallel Resonant Converter with Capacitive Output Filter
By Alexander Bucher; Thomas Duerbaum; Daniel Kuebrich [View]
[Download]

Abstract: Several different approaches for the investigation of the steady-state properties of resonant converters have been published to date. In addition to solving the occurring equations in the time domain, which turns out to be quite cumbersome, the designer can make use of approximate approaches in the frequency domain. Two of these methods are compared to the exact solution with regard to their accuracy and mathematical complexity within this paper for the parallel loaded resonant LC converter with capacitive output filter. Some practical aspects are discussed by means of measured voltage conversion ratios.

   Control principle and modulation method for bi-directional and dual-coupled series resonant converters
By Yonghua Cheng; Joeri Van Mierlo; Philippe Lataire [View]
[Download]

Abstract: Using two off-the-shelf IGBT converters, bi-directional series resonant converters are configured to achieve high efficiency for the application of super capacitor based energy storages as peak power unit. The proposed control principle and modulation method decouple the sampling and switching frequencies. As a result, the size of resonant circuit is maximally reduced by increasing the switching frequency without increasing too much processing speed of the control system.

   Theoretical Analysis and Optimal Design of LLC Resonant Converter
By Jee-hoon Jung; Joong-gi Kwon [View]
[Download]

Abstract: A LLC resonant topology is analyzed to derive efficiency and cost optimal design for wide input ranges and load variations. In the LLC converter, a wide range of output power is controlled with only a narrow variation in operating frequency since this converter is capable of both step-up and stepdown. In addition, ZVS turn-on and ZCS turn-off of MOSFETs and diode rectifiers can be achieved over the entire operating range. Finally, the inductance of a resonant tank in the primary side can be merged in the main power transformer by resonant inductance and the absence of the secondary filter inductor makes low voltage stress on secondary rectifier and cost-effective property. DC characteristics and input-output response in frequency domain are obtained with the equivalent circuit derived by first harmonic approximation (FHA) method. In addition, operational principles are explained to show the ZVS and ZCS conditions of primary switches and output diode rectifiers, respectively. Efficiency and cost optimal design rules of the LLC resonant converter are derived by a primary resonant network, operating frequency, and dead time duration. Proposed analysis and designation are proved by experimental results with a 400W LLC resonant converter.

EPE 2007 - Subtopic 04-1 - LS: Soft switching converters: resonant, ZVS, ZCS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 04: 'Soft switching converters and control' > EPE 2007 - Subtopic 04-1 - LS: Soft switching converters: resonant, ZVS, ZCS
	[return to parent folder]

	Three Phase Current Source Auxiliary Resonant Commutated Pole Inverter using IGBTs By W.-R. Canders; N. Lescow; F. Hinrichsen	[View] [Download]
Abstract: To reduce the losses of power inverters, resonant topologies replace hard switching power inverters. This paper shows the first investigations and measurements carried out to design a three phase current link power inverter in ARCP (Auxiliary Resonant Commutated Pole) topology as well as the finally measurements and results achieved with the complete system.

	Comparison of single-phase matrix converter and H-bridge converter for radio By N. Nguyen-Quang; D.A. Stone; C.M. Bingham; M.P. Foster	[View] [Download]
Abstract: This paper compares the newly developed single-phase matrix converter and the more conventional Hbridge converter for radio frequency induction heating. Both the converters exhibit unity power factor, very low total harmonic distortion at the utility supply interface, good controllability under soft switching condition for a wide range of power, and high efficiencies, whilst still having simple structures. A novel switching control pattern has been proposed for the matrix converter in order to maintain the comparable performance to the H-bridge converter. Simulation and experimental results for both converters are presented. Comparisons between two converters have confirmed the excellent performance of the proposed matrix converter.

	Wide input Voltage range Compensation in DC/DC Resonant Architecture for On-Board Traction Power Supplies By A. Coccia; F. Canales; P. Barbosa; S. Ponnaluri	[View] [Download]
Abstract: Several methods to reduce the effect of wide input voltage variation in soft-switched DC/DC converters for high-power and high-voltage traction applications are presented in this paper. To enhance high conversion efficiency together with high reliability and cost reduction, the document addresses the use of a power architecture whose front-end is a three-level half-bridge converter non standard NPC configuration. Thanks to a structured control methodology based on the possibility to use either a two-level or a three-level modulation strategy according to the input voltage level, it is possible to optimize the converter performance over the whole input voltage range. First, the soft-switching implementation of the converter which allows ZVS operation in the entire load range by using the magnetizing inductance of the transformer is discussed. Then, the operation of the converter at both two-level and three-level operation is addressed. Concluding, experimental results obtained in the specified input voltage range are presented to confirm the validity of the theoretical analysis.

	A Novel Soft-Switching Bridgeless Power Factor Correction Circuit By Hsien-Yi Tsai; Tsun-Hsiao Hsia; Dan Chen	[View] [Download]
Abstract: A novel zero- voltage- transition (ZVT) bridgeless power factor correction circuit (PFC) was proposed. An auxiliary circuit, consisting of a resonant inductor, two blocking diodes, one wheeling diode and an assist MOSFET, was used to reduce the turn-on switching loss of the two main switches of the bridgeless PFC circuit. Soft commutation of the main switches is achieved without imposing additional voltage stress on the main switches. Feedback gate-drive signals were obtained by using existing converter IC controller. In this paper, a detailed description of the operation of the proposed circuit will be given. Based on the analysis, guidelines for the component selection are presented. A prototype of 100-kHz, 600-W, universal-line PFC bridgeless circuit was built to verify the proposed scheme.

	Power factor control of the LCC current-output resonant converter By A. J. Gilbert; C. M. Bingham; D. A. Stone; M. P. Foster	[View] [Download]
Abstract: An improved control strategy for LCC current-output resonant converters is proposed. Small/largesignal converter models and the steady-state dynamics of the converter are used for controlling powerfactor. The proposed method provides a convenient, linear control mechanism for the design of regulators, which has a similar influence to varying the DC-link supply voltage in terms of outputvoltage/ current control, which, whilst being desirable, is normally not a realistic proposition for commercial supplies.

	Design of an LCC current-output resonant converter for use as a constant current source By A. J. Gilbert; D. A. Stone; C. M. Bingham; M. P. Foster	[View] [Download]
Abstract: A methodology for the design of LCC resonant current-source converters, is presented. Unlike previous techniques, the resulting converter provides near constant steady-state output current over an extended load range when excited at the resonant frequency, through use of a self-oscillating controller.

	Comparison of Methods for the Analysis of the Parallel Resonant Converter with Capacitive Output Filter By Alexander Bucher; Thomas Duerbaum; Daniel Kuebrich	[View] [Download]
Abstract: Several different approaches for the investigation of the steady-state properties of resonant converters have been published to date. In addition to solving the occurring equations in the time domain, which turns out to be quite cumbersome, the designer can make use of approximate approaches in the frequency domain. Two of these methods are compared to the exact solution with regard to their accuracy and mathematical complexity within this paper for the parallel loaded resonant LC converter with capacitive output filter. Some practical aspects are discussed by means of measured voltage conversion ratios.

	Control principle and modulation method for bi-directional and dual-coupled series resonant converters By Yonghua Cheng; Joeri Van Mierlo; Philippe Lataire	[View] [Download]
Abstract: Using two off-the-shelf IGBT converters, bi-directional series resonant converters are configured to achieve high efficiency for the application of super capacitor based energy storages as peak power unit. The proposed control principle and modulation method decouple the sampling and switching frequencies. As a result, the size of resonant circuit is maximally reduced by increasing the switching frequency without increasing too much processing speed of the control system.

	Theoretical Analysis and Optimal Design of LLC Resonant Converter By Jee-hoon Jung; Joong-gi Kwon	[View] [Download]
Abstract: A LLC resonant topology is analyzed to derive efficiency and cost optimal design for wide input ranges and load variations. In the LLC converter, a wide range of output power is controlled with only a narrow variation in operating frequency since this converter is capable of both step-up and stepdown. In addition, ZVS turn-on and ZCS turn-off of MOSFETs and diode rectifiers can be achieved over the entire operating range. Finally, the inductance of a resonant tank in the primary side can be merged in the main power transformer by resonant inductance and the absence of the secondary filter inductor makes low voltage stress on secondary rectifier and cost-effective property. DC characteristics and input-output response in frequency domain are obtained with the equivalent circuit derived by first harmonic approximation (FHA) method. In addition, operational principles are explained to show the ZVS and ZCS conditions of primary switches and output diode rectifiers, respectively. Efficiency and cost optimal design rules of the LLC resonant converter are derived by a primary resonant network, operating frequency, and dead time duration. Proposed analysis and designation are proved by experimental results with a 400W LLC resonant converter.