EPE Association: EPE 1993 - 28 - Dialogue Session DS1.4: POWER SUPPLIES: SOFT SWITCHING

EPE 1993 - 28 - Dialogue Session DS1.4: POWER SUPPLIES: SOFT SWITCHING
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 28 - Dialogue Session DS1.4: POWER SUPPLIES: SOFT SWITCHING

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   MODELING OF ZCS MULTIRESONANT SERIES-PARALLEL CONVERTERS USING ENERGY CONCEPTS
By Shahrokh Farhangi; Ulrich Kirchenberger; Dierck Schroeder [View]
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Abstract: Energy and physical concepts are used in this paper to find the steady-state characteristic equations of an ideal Multiresonant Series-Parallel Converter (MRSPC). The converter has a capacitive output filter, and operates in an under-resonant regime. In this regime Zero Current Switching (ZCS) is possible, which reduces the tailing current problem of bipolar power devices. This converter can be used for capacitor charging in laser power supplies and pulsed power applications. A closed form solution, based on state-space analysis, is found for this converter. This approach simplifies the mathematical operations and reduces the computation time in simulation and optimization routines. Based on the model, the steady-state characteristics of the converter are derived by a simulation program, and compared with the Series Resonant Half-bridge Converter (SRHC). These characteristics can be used for the optimum design of the converter for a given input voltage and load range. The output current characteristics in discontinuous current regime are also discussed, which provide design guidelines for capacitor charging applications.

   DESIGN-ORIENTED ANALYSIS OF A RESONANT ZVS / ZCS DC-DC CONVERTER
By D. C. Hamill; K. N. Bateson [View]
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Abstract: A new analysis of the Ghislanzoni-Weinberg resonant ZVS/ZCS converter yields normalised graphs and approximate equations suitable for design use. A design procedure is presented. For an experimental converter, theoretical predictions, simulation results and laboratory measurements are in good agreement, with an efficiency of 93% being obtained.

   A ZVT BUCK CONVERTER USING A FEEDBACK RESONANT CIRCUlT
By Luiz Carlos de Freitas; Paulo Roberto Coelho Gomes [View]
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Abstract: This paper presents a Buck DC-to-DC converter using a novel lossless commutation cell for high switching frequency and high power operation. The proposed cell consists of a main and an auxiliary switches, with ZVS and ZCS switching characteristics, respectively. The converter control using this cell is realized by the PWM technic, with constant switching frequency operation. The complete operation principles, theoretical analysis, relevant equations, state space phase, simulation and experimental results for the Buck converter are presented.

   ZVS HF RESONANT CONVERTER WITH BIDIRECTIONAL SWITCHES
By D. Zadravec; R. Filipitsch; F. Mihalic; K. Krischan; M. Milanovic; K. Jezernik; M. Rentmeister [View]
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Abstract: The simulation of the controlled HF AC-link resonant converter with bidirectional switches is shown in the paper. The main-side converter controller fulfills the requirements of sinusoidal input currents, zero voltage switching and nearly constant resonant voltage amplitude. At the load side, a simple on-off current controller is implemented. The zero voltage switching technique (ZVS) reduces the switching losses and introduces a modulation strategy called pulse density modulation (PDM). The simulation program PADSIM with user-programmable blocks was used to analyze the complete converter. Simulation results give valuable insights into necessary control actions, about resonant tank design and about robust bidirectional switch necessity. Results of laboratory experiments with a half-bridge converter with two bidirectional switches are shown finally. The switch consists of two IGBT's with a single driver circuit. With proper driver voltage, switching actions without snubber elements are allowed.

EPE 1993 - 28 - Dialogue Session DS1.4: POWER SUPPLIES: SOFT SWITCHING
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 28 - Dialogue Session DS1.4: POWER SUPPLIES: SOFT SWITCHING
	[return to parent folder]

	MODELING OF ZCS MULTIRESONANT SERIES-PARALLEL CONVERTERS USING ENERGY CONCEPTS By Shahrokh Farhangi; Ulrich Kirchenberger; Dierck Schroeder	[View] [Download]
Abstract: Energy and physical concepts are used in this paper to find the steady-state characteristic equations of an ideal Multiresonant Series-Parallel Converter (MRSPC). The converter has a capacitive output filter, and operates in an under-resonant regime. In this regime Zero Current Switching (ZCS) is possible, which reduces the tailing current problem of bipolar power devices. This converter can be used for capacitor charging in laser power supplies and pulsed power applications. A closed form solution, based on state-space analysis, is found for this converter. This approach simplifies the mathematical operations and reduces the computation time in simulation and optimization routines. Based on the model, the steady-state characteristics of the converter are derived by a simulation program, and compared with the Series Resonant Half-bridge Converter (SRHC). These characteristics can be used for the optimum design of the converter for a given input voltage and load range. The output current characteristics in discontinuous current regime are also discussed, which provide design guidelines for capacitor charging applications.

	DESIGN-ORIENTED ANALYSIS OF A RESONANT ZVS / ZCS DC-DC CONVERTER By D. C. Hamill; K. N. Bateson	[View] [Download]
Abstract: A new analysis of the Ghislanzoni-Weinberg resonant ZVS/ZCS converter yields normalised graphs and approximate equations suitable for design use. A design procedure is presented. For an experimental converter, theoretical predictions, simulation results and laboratory measurements are in good agreement, with an efficiency of 93% being obtained.

	A ZVT BUCK CONVERTER USING A FEEDBACK RESONANT CIRCUlT By Luiz Carlos de Freitas; Paulo Roberto Coelho Gomes	[View] [Download]
Abstract: This paper presents a Buck DC-to-DC converter using a novel lossless commutation cell for high switching frequency and high power operation. The proposed cell consists of a main and an auxiliary switches, with ZVS and ZCS switching characteristics, respectively. The converter control using this cell is realized by the PWM technic, with constant switching frequency operation. The complete operation principles, theoretical analysis, relevant equations, state space phase, simulation and experimental results for the Buck converter are presented.

	ZVS HF RESONANT CONVERTER WITH BIDIRECTIONAL SWITCHES By D. Zadravec; R. Filipitsch; F. Mihalic; K. Krischan; M. Milanovic; K. Jezernik; M. Rentmeister	[View] [Download]
Abstract: The simulation of the controlled HF AC-link resonant converter with bidirectional switches is shown in the paper. The main-side converter controller fulfills the requirements of sinusoidal input currents, zero voltage switching and nearly constant resonant voltage amplitude. At the load side, a simple on-off current controller is implemented. The zero voltage switching technique (ZVS) reduces the switching losses and introduces a modulation strategy called pulse density modulation (PDM). The simulation program PADSIM with user-programmable blocks was used to analyze the complete converter. Simulation results give valuable insights into necessary control actions, about resonant tank design and about robust bidirectional switch necessity. Results of laboratory experiments with a half-bridge converter with two bidirectional switches are shown finally. The switch consists of two IGBT's with a single driver circuit. With proper driver voltage, switching actions without snubber elements are allowed.