EPE Association: EPE 2007 - Subtopic 15-3 - LS: Electronic ballasts and solid state lighting; high power density system design

EPE 2007 - Subtopic 15-3 - LS: Electronic ballasts and solid state lighting; high power density system design
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 15: 'Power supplies' > EPE 2007 - Subtopic 15-3 - LS: Electronic ballasts and solid state lighting; high power density system design

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   A variable frequency high-voltage power supply for hot-restrike modelling of HID lamps
By TANT Peter; VANBRABANT Bart; DRIESEN Johan; DECONINCK Geert [View]
[Download]

Abstract: This paper proposes a high-voltage power supply which produces a continuous sine-wave voltage with adjustable amplitude (0-20 kV) and frequency (10-300 kHz). The power supply is used to determine the cold and hot breakdown properties of High Pressure Discharge (HID) lamps, emulating the sinusoidal waveforms typically found in standard resonant igniter circuits. The test system is suited for automated measurements of hot-restrike characteristics of HID lamps, giving the required ignition voltage as a function of time after lamp switch-off. Measurement results for different operating conditions are presented and discussed.

   Dynamic Analysis of Hybrid DC-DC Converters
By HUERTA Jose Maria; MARTINEZ Herminio; CONESA Alfonso [View]
[Download]

Abstract: This paper shows the analysis and implementation of a hybrid DC-DC power converter. The proposed topology consists of a series linear voltage regulator in parallel with a switching step-down converter. This topology can provide small ripple at the output voltage, fast responses for load variations and high efficiency for high load current conditions. In the hybrid structures there is not a classical feedback loop as in DC-DC converters, but they are feedback systems too. Therefore, their smallsignal analysis is important to assure stability of the implemented power supply system. From the analysis proposed we deduce the critical components that induce instability to the converter and how to improve the final design.

   Impact of Remote Sensing on Converter Stability and Performance
By SIPPOLA Mika; SUNTIO Teuvo; KARPPANEN Matti [View]
[Download]

Abstract: Output-voltage remote sensing is typically used to improve static voltage accuracy at the point of load as well as to improve the load transient response. Every switched-mode converter has its unique dynamical profile, which may definitively change due to adding of extra impedances into the converter, when the output-voltage remote sensing is applied. A typical effect of a pure cable connection is an increase in the capacitive-load sensitivity especially at high frequencies. Resonant-type impedances may have more profound effects making the converter more sensitive to other types of source and load interactions. The paper provides consistent methods to analyze the impact of remote sensing based on a general two-port model of an electrical voltage-output system. Buck converters are used to provide practical evidence.

EPE 2007 - Subtopic 15-3 - LS: Electronic ballasts and solid state lighting; high power density system design
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 15: 'Power supplies' > EPE 2007 - Subtopic 15-3 - LS: Electronic ballasts and solid state lighting; high power density system design
	[return to parent folder]

	A variable frequency high-voltage power supply for hot-restrike modelling of HID lamps By TANT Peter; VANBRABANT Bart; DRIESEN Johan; DECONINCK Geert	[View] [Download]
Abstract: This paper proposes a high-voltage power supply which produces a continuous sine-wave voltage with adjustable amplitude (0-20 kV) and frequency (10-300 kHz). The power supply is used to determine the cold and hot breakdown properties of High Pressure Discharge (HID) lamps, emulating the sinusoidal waveforms typically found in standard resonant igniter circuits. The test system is suited for automated measurements of hot-restrike characteristics of HID lamps, giving the required ignition voltage as a function of time after lamp switch-off. Measurement results for different operating conditions are presented and discussed.

	Dynamic Analysis of Hybrid DC-DC Converters By HUERTA Jose Maria; MARTINEZ Herminio; CONESA Alfonso	[View] [Download]
Abstract: This paper shows the analysis and implementation of a hybrid DC-DC power converter. The proposed topology consists of a series linear voltage regulator in parallel with a switching step-down converter. This topology can provide small ripple at the output voltage, fast responses for load variations and high efficiency for high load current conditions. In the hybrid structures there is not a classical feedback loop as in DC-DC converters, but they are feedback systems too. Therefore, their smallsignal analysis is important to assure stability of the implemented power supply system. From the analysis proposed we deduce the critical components that induce instability to the converter and how to improve the final design.

	Impact of Remote Sensing on Converter Stability and Performance By SIPPOLA Mika; SUNTIO Teuvo; KARPPANEN Matti	[View] [Download]
Abstract: Output-voltage remote sensing is typically used to improve static voltage accuracy at the point of load as well as to improve the load transient response. Every switched-mode converter has its unique dynamical profile, which may definitively change due to adding of extra impedances into the converter, when the output-voltage remote sensing is applied. A typical effect of a pure cable connection is an increase in the capacitive-load sensitivity especially at high frequencies. Resonant-type impedances may have more profound effects making the converter more sensitive to other types of source and load interactions. The paper provides consistent methods to analyze the impact of remote sensing based on a general two-port model of an electrical voltage-output system. Buck converters are used to provide practical evidence.