DocumentCode :
2206637
Title :
Full digital dimming regulation of fluorescent lamps with -54 dB/Hz light ripple
Author :
Killat, Dirk ; Baraniecki, Robert
Author_Institution :
Dialog Semicond., Kirchheim, Germany
Volume :
4
fYear :
2005
fDate :
2-6 Oct. 2005
Firstpage :
2734
Abstract :
The digital regulation principle for electronic ballasts for flourescent lamps presented here is well suited for system-on-chip integration of digital controlled ballasts for dimming applications. The digital regulation achieves a 16-bit adjustment accuracy of the lamp voltage frequency from 40 kHz to 120 kHz using only a 40 MHz system clock. A digital second order ΔΣ-modulator converts the 16-bit target value for the lamp frequency to a 10-bit value for the digital controlled oscillator that has a time resolution of 25 nsec. The virtual enhancement of the time resolution of the DCO allows a fine adjustment of the average lamp frequency making an analog VCO unnecessary. The principle is well suited for dimming of compact fluorescent lamps down to 1% dim level with a very low light flicker of -54 dB equivalent to 56 μW/Hz in the visible frequency range.
Keywords :
delta-sigma modulation; digital control; fluorescent lamps; lamp accessories; system-on-chip; voltage-controlled oscillators; 40 MHz; 40 to 120 kHz; VCO; delta-sigma modulator; digital controlled ballast; digital dimming; digital regulation; electronic ballasts; fluorescent lamps; light ripple; system-on-chip integration; voltage-controlled oscillators; Clocks; Control systems; Digital control; Digital-controlled oscillators; Electronic ballasts; Fluorescent lamps; Frequency conversion; System-on-a-chip; Voltage; Voltage-controlled oscillators;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005
ISSN :
0197-2618
Print_ISBN :
0-7803-9208-6
Type :
conf
DOI :
10.1109/IAS.2005.1518848
Filename :
1518848
Link To Document :
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