EPE Association: EPE 2009 - Subtopic 16-1 - LS: 'Power Supplies

EPE 2009 - Subtopic 16-1 - LS: 'Power Supplies - EMI & Over-Voltage Protection'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 16: 'Power Supplies' > EPE 2009 - Subtopic 16-1 - LS: 'Power Supplies - EMI & Over-Voltage Protection'

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   A new switching frequency modulation scheme for EMI reduction in multiconverter topology
By Juan MON, Javier GAGO, GonzÃ¡lez DAVID, Josep BALCELLS, Raul FERNÃNDEZ, Ignacio GIL [View]
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Abstract: This paper presents a modulation scheme in order to reduce conducted Electromagnetic Interference (EMI) generated by modular power converters with parallel topology. The proposed scheme is based on a combination of interleaving and Switching Frequency Modulation (SFM) techniques. The objective of this modulation scheme is to cancel certain harmonics of EMI and to reduce the amplitude of the remaining harmonics. The proposed scheme has been implemented in a field programmable gate array and a four channel parallel buck converter has been used in order to verify it. A significant EMI reduction has been obtained in comparison to use the interleaving and Switching Frequency Modulation separately.

   Conducted EMI Analysis of Hard and Soft Switching Arc Welding Power Supplies
By Wolfgang FISCHER, Reinhard DOEBBELIN, Andreas LINDEMANN [View]
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Abstract: The switching actions of power semiconductors cause unwanted electromagnetic emissions of switched-mode power supplies. The dv/dt- and di/dt-values of the voltage and current slopes at the semiconductors as the origin of disturbances can be reduced using resonant or soft-switching techniques which may represent an extra effort concerning the design of the power supply. The consideration and optimization of the propagation paths give further possibilities to reduce conducted electromagnetic emissions. In this paper, the effectiveness of different electromagnetic interference (EMI) reduction techniques will be experimentally evaluated.

   Dynamic analysis of PCM-controlled coupled-inductor superbuck converter
By Jari LEPPÃ„AHO, Juha HUUSARI, Teuvo SUNTIO [View]
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Abstract: The paper investigates the dynamic effects the coupled-inductor technique creates in a superbuck converter. The results are compared to the corresponding discrete-inductor converter. It is well known that the ripple current in an inductor can be significantly reduced by using coupled inductors. The investigations show that the transient dynamics of the converter is substantially reduced by the application of the coupled-inductor technique compared to the corresponding discrete-inductor converter due to the appearance of a resonant right-half-plane zero pair. The theoretical findings are validated by experimental evidence.

EPE 2009 - Subtopic 16-1 - LS: 'Power Supplies - EMI & Over-Voltage Protection'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 16: 'Power Supplies' > EPE 2009 - Subtopic 16-1 - LS: 'Power Supplies - EMI & Over-Voltage Protection'
	[return to parent folder]

	A new switching frequency modulation scheme for EMI reduction in multiconverter topology By Juan MON, Javier GAGO, GonzÃ¡lez DAVID, Josep BALCELLS, Raul FERNÃNDEZ, Ignacio GIL	[View] [Download]
Abstract: This paper presents a modulation scheme in order to reduce conducted Electromagnetic Interference (EMI) generated by modular power converters with parallel topology. The proposed scheme is based on a combination of interleaving and Switching Frequency Modulation (SFM) techniques. The objective of this modulation scheme is to cancel certain harmonics of EMI and to reduce the amplitude of the remaining harmonics. The proposed scheme has been implemented in a field programmable gate array and a four channel parallel buck converter has been used in order to verify it. A significant EMI reduction has been obtained in comparison to use the interleaving and Switching Frequency Modulation separately.

	Conducted EMI Analysis of Hard and Soft Switching Arc Welding Power Supplies By Wolfgang FISCHER, Reinhard DOEBBELIN, Andreas LINDEMANN	[View] [Download]
Abstract: The switching actions of power semiconductors cause unwanted electromagnetic emissions of switched-mode power supplies. The dv/dt- and di/dt-values of the voltage and current slopes at the semiconductors as the origin of disturbances can be reduced using resonant or soft-switching techniques which may represent an extra effort concerning the design of the power supply. The consideration and optimization of the propagation paths give further possibilities to reduce conducted electromagnetic emissions. In this paper, the effectiveness of different electromagnetic interference (EMI) reduction techniques will be experimentally evaluated.

	Dynamic analysis of PCM-controlled coupled-inductor superbuck converter By Jari LEPPÃ„AHO, Juha HUUSARI, Teuvo SUNTIO	[View] [Download]
Abstract: The paper investigates the dynamic effects the coupled-inductor technique creates in a superbuck converter. The results are compared to the corresponding discrete-inductor converter. It is well known that the ripple current in an inductor can be significantly reduced by using coupled inductors. The investigations show that the transient dynamics of the converter is substantially reduced by the application of the coupled-inductor technique compared to the corresponding discrete-inductor converter due to the appearance of a resonant right-half-plane zero pair. The theoretical findings are validated by experimental evidence.