EPE Association: EPE 2001 - Topic 03c: Switched and Resonant-Mode Power Supplies

EPE 2001 - Topic 03c: Switched and Resonant-Mode Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 03: POWER SUPPLIES > EPE 2001 - Topic 03c: Switched and Resonant-Mode Power Supplies

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   A Novel Topology to Reduce Power Losses in Synchronous Rectifiers
By T. Reimann; W. Huamin; J. Petzoldt; C. Zhiming; M. Scherf [View]
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Abstract: The paper investigates the power losses and temperature performance of MOSFET devices in a low voltage synchronous rectifier circuit. Different devices are applied to compare their characteristics and several auxiliary circuits are proposed to improve the efficiency of the power converter. The novel topologies are discussed using PSPICE simulations and experimental results. It is shown that adding an auxiliary circuit in synchronous rectifiers using MOSFETs as main devices is an effective method to reduce the power losses. So, the power MOSFETs can operate with reduced heat sink under high current condition.

   Application of self-adjusting features of resonant converters
By K. Janson; J. Järvik; T. Vinnal [View]
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Abstract: For supply consumers, that need approximately constant power at variable load resistance it is suitable to use the converter with alternating parallel and series resonance. Such converter operates like a transformer with variable transforming ratio. The electromagnetic processes in the converter and the converter parameters at different loads are described.

   Asymmetrical rectifier with isolated secondary regulation
By M. Michon; J.L. Duarte; M. Hendrix [View]
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Abstract: A soft-switching DC-DC power supply with isolated multiple outputs is described. It has the ability to provide regulation for the outputs without using secondary-to-primary feedback signals. The rectifiers on the secondary side are operated with asymmetrical conduction times and can be independently regulated. As an application example, a three-output converter for feeding high performance LEDs is analyzed, modeled and implemented. Relevant measurements from a 50W/200kHz prototype are given.

   High-power-factor isolated resonant rectifier topology
By M. Castilla; L. García de Vicuña; J. M. Guerrero; O. López [View]
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Abstract: This paper presents a new third-order isolated series-loaded resonant circuit using quantum control which operates as a high-power-factor rectifier. In relation to conventional load-resonant converters, the proposed topology show the next interesting features: low-input current distortion, step-down and step-up operation, ZCS conditions, and peak current in power devices proportional to load current.

   Multi-Resonant Soft-Switched Forward Type AC/DC Converter
By M. Nagao; K. Harada [View]
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Abstract: This paper presents a novel AC/DC converter circuit employing a multi resonance. This converter is constructed basically by a forward type DC/DC converter and connected only one resonance capacitor CR. The proposed converter accomplishes high power factor and soft switching under constant switching frequency without the feedback diode to reset the transformer.

   Optimised Pulse Modulation for Plasma Power Supply
By P. Schmitt; C. Gerster [View]
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Abstract: In this paper, a new modulation technique is introduced that combines current- and voltage mode control with active pulse balancing to prevent saturation of the transformer of a modular switched mode power supply for plasma applications. Transformers with amorphous alloy or nano-crystallin alloy core materials can be operated efficiently in the medium-frequency range with resonant IGBT circuits. The switching commands for the power semiconductor are preferably digitally generated. The modulation technique was realized with a CPLD and tested in a digital controlled plasma supply.

EPE 2001 - Topic 03c: Switched and Resonant-Mode Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 03: POWER SUPPLIES > EPE 2001 - Topic 03c: Switched and Resonant-Mode Power Supplies
	[return to parent folder]

	A Novel Topology to Reduce Power Losses in Synchronous Rectifiers By T. Reimann; W. Huamin; J. Petzoldt; C. Zhiming; M. Scherf	[View] [Download]
Abstract: The paper investigates the power losses and temperature performance of MOSFET devices in a low voltage synchronous rectifier circuit. Different devices are applied to compare their characteristics and several auxiliary circuits are proposed to improve the efficiency of the power converter. The novel topologies are discussed using PSPICE simulations and experimental results. It is shown that adding an auxiliary circuit in synchronous rectifiers using MOSFETs as main devices is an effective method to reduce the power losses. So, the power MOSFETs can operate with reduced heat sink under high current condition.

	Application of self-adjusting features of resonant converters By K. Janson; J. Järvik; T. Vinnal	[View] [Download]
Abstract: For supply consumers, that need approximately constant power at variable load resistance it is suitable to use the converter with alternating parallel and series resonance. Such converter operates like a transformer with variable transforming ratio. The electromagnetic processes in the converter and the converter parameters at different loads are described.

	Asymmetrical rectifier with isolated secondary regulation By M. Michon; J.L. Duarte; M. Hendrix	[View] [Download]
Abstract: A soft-switching DC-DC power supply with isolated multiple outputs is described. It has the ability to provide regulation for the outputs without using secondary-to-primary feedback signals. The rectifiers on the secondary side are operated with asymmetrical conduction times and can be independently regulated. As an application example, a three-output converter for feeding high performance LEDs is analyzed, modeled and implemented. Relevant measurements from a 50W/200kHz prototype are given.

	High-power-factor isolated resonant rectifier topology By M. Castilla; L. García de Vicuña; J. M. Guerrero; O. López	[View] [Download]
Abstract: This paper presents a new third-order isolated series-loaded resonant circuit using quantum control which operates as a high-power-factor rectifier. In relation to conventional load-resonant converters, the proposed topology show the next interesting features: low-input current distortion, step-down and step-up operation, ZCS conditions, and peak current in power devices proportional to load current.

	Multi-Resonant Soft-Switched Forward Type AC/DC Converter By M. Nagao; K. Harada	[View] [Download]
Abstract: This paper presents a novel AC/DC converter circuit employing a multi resonance. This converter is constructed basically by a forward type DC/DC converter and connected only one resonance capacitor CR. The proposed converter accomplishes high power factor and soft switching under constant switching frequency without the feedback diode to reset the transformer.

	Optimised Pulse Modulation for Plasma Power Supply By P. Schmitt; C. Gerster	[View] [Download]
Abstract: In this paper, a new modulation technique is introduced that combines current- and voltage mode control with active pulse balancing to prevent saturation of the transformer of a modular switched mode power supply for plasma applications. Transformers with amorphous alloy or nano-crystallin alloy core materials can be operated efficiently in the medium-frequency range with resonant IGBT circuits. The switching commands for the power semiconductor are preferably digitally generated. The modulation technique was realized with a CPLD and tested in a digital controlled plasma supply.