EPE Association: EPE 2007 - Subtopic 15-2

EPE 2007 - Subtopic 15-2 - LS: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 15: 'Power supplies' > EPE 2007 - Subtopic 15-2 - LS: Power Supplies

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   Dynamic characterization of Power Converters for Distributed Power Supply
By BELLONI Federico; RIVA Marco [View]
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Abstract: The lasts generations of microprocessors have shown an increase in the operating frequency and, of course, in the supply characteristics. The different need of power requested made necessary new solution for the distributed power supply architectures (DPA) and claimed the use of converters suitable to meet the new high efficiency and high power exigencies. This paper is focused on the design and dynamic characterization of a DC-DC converter specifically devoted for telecom/networking/computing applications: a Switch in Line Converter (SILC). Its analysis has been obtained by means of a dedicated automatic tool, FREDOMSIM, and accomplished over its whole operating area: with different output power and load typologies (resistive, current sink and constant power). The proposed power cell exhibits a pseudo-first order dynamics, optimum for the design of an external feedback network characterized by large stability margins for all the operative conditions. Comparisons with the experimental data, given in the paper, will confirm the predictions.

   A New Soft-Switching Multi-Output Forward Converter with Independent and Precise Voltage Regulation
By YILDIRIM Deniz; ERTIKE Sukru [View]
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Abstract: In this study, a soft switching, independently and precisely regulated multi-output forward converter is proposed. Proposed multi-output forward converter has synchronous rectifiers at each output and an active clamp at the primary. All of the semiconductor switches in the converter are soft switched. Each output is controlled by a separate controller. Duty cycles of the active clamp switch and primary switch are determined from outputs' duty cycle information. The topology and control method ensures high efficiency and precise voltage regulation of multi-output forward converters with wide load variations. Simulation results have verified the proposed concept.

   Power Supply with Independently Regulated Multiple Outputs
By WIZA Margaret; SABATE Juan; LIU Yunfeng [View]
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Abstract: This paper presents a new power supply with independently-regulated multiple isolated-outputs, based on a phase-shift PWM control of a multi-leg bridge. The power supply was developed for a multi-level switched-gradient-amplifier for Magnetic Resonance Imaging (MRI) systems that require good regulation during all operating conditions for good image quality. The gradient driver is a challenging load, almost purely reactive with large power transients. The power supply topology consists on one half-bridge leg for each independent output plus an additional common leg. The control is achieved by phase-shifting each leg with respect to the common leg, with two transformers with their primary connected between its corresponding leg and the common leg. Experimental results obtained with a 60kW prototype confirm the validity of the concept.

EPE 2007 - Subtopic 15-2 - LS: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 15: 'Power supplies' > EPE 2007 - Subtopic 15-2 - LS: Power Supplies
	[return to parent folder]

	Dynamic characterization of Power Converters for Distributed Power Supply By BELLONI Federico; RIVA Marco	[View] [Download]
Abstract: The lasts generations of microprocessors have shown an increase in the operating frequency and, of course, in the supply characteristics. The different need of power requested made necessary new solution for the distributed power supply architectures (DPA) and claimed the use of converters suitable to meet the new high efficiency and high power exigencies. This paper is focused on the design and dynamic characterization of a DC-DC converter specifically devoted for telecom/networking/computing applications: a Switch in Line Converter (SILC). Its analysis has been obtained by means of a dedicated automatic tool, FREDOMSIM, and accomplished over its whole operating area: with different output power and load typologies (resistive, current sink and constant power). The proposed power cell exhibits a pseudo-first order dynamics, optimum for the design of an external feedback network characterized by large stability margins for all the operative conditions. Comparisons with the experimental data, given in the paper, will confirm the predictions.

	A New Soft-Switching Multi-Output Forward Converter with Independent and Precise Voltage Regulation By YILDIRIM Deniz; ERTIKE Sukru	[View] [Download]
Abstract: In this study, a soft switching, independently and precisely regulated multi-output forward converter is proposed. Proposed multi-output forward converter has synchronous rectifiers at each output and an active clamp at the primary. All of the semiconductor switches in the converter are soft switched. Each output is controlled by a separate controller. Duty cycles of the active clamp switch and primary switch are determined from outputs' duty cycle information. The topology and control method ensures high efficiency and precise voltage regulation of multi-output forward converters with wide load variations. Simulation results have verified the proposed concept.

	Power Supply with Independently Regulated Multiple Outputs By WIZA Margaret; SABATE Juan; LIU Yunfeng	[View] [Download]
Abstract: This paper presents a new power supply with independently-regulated multiple isolated-outputs, based on a phase-shift PWM control of a multi-leg bridge. The power supply was developed for a multi-level switched-gradient-amplifier for Magnetic Resonance Imaging (MRI) systems that require good regulation during all operating conditions for good image quality. The gradient driver is a challenging load, almost purely reactive with large power transients. The power supply topology consists on one half-bridge leg for each independent output plus an additional common leg. The control is achieved by phase-shifting each leg with respect to the common leg, with two transformers with their primary connected between its corresponding leg and the common leg. Experimental results obtained with a 60kW prototype confirm the validity of the concept.