EPE Association: EPE 2011 - LS4f: Topic 17: Electronic Ballast and Solid State Lighting

EPE 2011 - LS4f: Topic 17: Electronic Ballast and Solid State Lighting
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 17: Power supplies > EPE 2011 - LS4f: Topic 17: Electronic Ballast and Solid State Lighting

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   Achieving Higher Power Density in DC-DC Converters through Current Ripple Increase
By Vladimir SCARPA, Samuel ARAUJO, Benjamin SAHAN, Peter ZACHARIAS [View]
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Abstract: This work describes how power density in DC-DC converters can be increased by combining high current ripple and smaller filter inductance. In combination to innovative semiconductor devices, this method presents less switching losses than, e.g., switching frequency increase. Drawbacks of such an approach are presented together with their possible solutions, so that the power density increase results in no considerable reduction in the converter efficiency. The methodology to identify this trade-off covers aspects on both magnetic and semiconductor designs. A 7.5kWmax Boost for photovoltaic applications is used to verify the methodology.

   Preliminary investigations of piezoelectric based LED luminary
By Dennis NIELSEN, Michael A. E. ANDERSEN, Kaspar SINDING MEYER [View]
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Abstract: This paper presents a preliminary study of PT (Piezoelectric Transformer) based SMPS's (Switch Mode Power Supplies) for LED luminary. The unique properties of PTs (efficiency, power density and EMI) make them highly suitable for this application. Power stage topologies, rectifiers circuits, modulation schemes, LEDs and LED driving conditions are analyzed. A prototype radial mode PT optimized for ZVS (Zero Voltage Switching) is designed. FEM (Final Element Method) and measurements validates the PT design. A prototype PT based AC/DC converter operating from european mains is proposed. The prototype constitutes a light source equivalent to the 40 W incandescent bulb. Experimental results shows, that the prototype are capable of ZVS and dimming (the later trough use of burst mode control).

   Primary-Controlled High-PF Flyback Converters Deliver Constant Dc Output Current
By Claudio ADRAGNA [View]
[Download]

Abstract: This paper describes a control method of high-power-factor flyback converters for regulating their dc output current using only quantities available on the primary side. The purpose is to achieve opto-less constant-current regulation in isolated offline drivers of LED lamps for bulb replacement where a power factor > 0.9 is required.

EPE 2011 - LS4f: Topic 17: Electronic Ballast and Solid State Lighting
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 17: Power supplies > EPE 2011 - LS4f: Topic 17: Electronic Ballast and Solid State Lighting
	[return to parent folder]

	Achieving Higher Power Density in DC-DC Converters through Current Ripple Increase By Vladimir SCARPA, Samuel ARAUJO, Benjamin SAHAN, Peter ZACHARIAS	[View] [Download]
Abstract: This work describes how power density in DC-DC converters can be increased by combining high current ripple and smaller filter inductance. In combination to innovative semiconductor devices, this method presents less switching losses than, e.g., switching frequency increase. Drawbacks of such an approach are presented together with their possible solutions, so that the power density increase results in no considerable reduction in the converter efficiency. The methodology to identify this trade-off covers aspects on both magnetic and semiconductor designs. A 7.5kWmax Boost for photovoltaic applications is used to verify the methodology.

	Preliminary investigations of piezoelectric based LED luminary By Dennis NIELSEN, Michael A. E. ANDERSEN, Kaspar SINDING MEYER	[View] [Download]
Abstract: This paper presents a preliminary study of PT (Piezoelectric Transformer) based SMPS's (Switch Mode Power Supplies) for LED luminary. The unique properties of PTs (efficiency, power density and EMI) make them highly suitable for this application. Power stage topologies, rectifiers circuits, modulation schemes, LEDs and LED driving conditions are analyzed. A prototype radial mode PT optimized for ZVS (Zero Voltage Switching) is designed. FEM (Final Element Method) and measurements validates the PT design. A prototype PT based AC/DC converter operating from european mains is proposed. The prototype constitutes a light source equivalent to the 40 W incandescent bulb. Experimental results shows, that the prototype are capable of ZVS and dimming (the later trough use of burst mode control).

	Primary-Controlled High-PF Flyback Converters Deliver Constant Dc Output Current By Claudio ADRAGNA	[View] [Download]
Abstract: This paper describes a control method of high-power-factor flyback converters for regulating their dc output current using only quantities available on the primary side. The purpose is to achieve opto-less constant-current regulation in isolated offline drivers of LED lamps for bulb replacement where a power factor > 0.9 is required.