Group-Asymmetrical PWM Control for Dimmable Fluorescent Lamp Ballast Without Striation and Thermostat Effect

In this paper a group-asymmetrical pulsewidth modulation (GAPWM) by signal process is explored to modulate the lamp current comprising even and odd harmonics, which can then eliminate striation and thermostat effects in a fluorescent lamp. Using GAPWM control, a hiding dc, like an electron cloud ins...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2009-05, Vol.24 (5), p.1293-1303
Main Author: HSIEH, Guan-Chyun
Format: Article
Language:English
Subjects:
Applied sciences
Ballast
Clouds
Dimmer
Electric currents
Electrical engineering. Electrical power engineering
Electronic ballasts
Electronics
Electrons
Energy efficiency
Exact sciences and technology
Fluorescent lamps
Fluorescent lighting
Fundamental areas of phenomenology (including applications)
group-asymmetrical pulsewidth modulation
Lamps
Luminance
Miscellaneous
Optical sources and standards
Optics
Physics
Pulse duration modulation
Pulse width modulation
Signal analysis
Signal processing
Space vector pulse width modulation
Striation
striation and thermostat effect
Switching
Thermostats
Transformers and inductors
Various equipment and components
Zero voltage switching
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Summary:In this paper a group-asymmetrical pulsewidth modulation (GAPWM) by signal process is explored to modulate the lamp current comprising even and odd harmonics, which can then eliminate striation and thermostat effects in a fluorescent lamp. Using GAPWM control, a hiding dc, like an electron cloud inside the lamp, disappears and good rejection to the thermostat effect is achieved since the average lamp current is null in the whole group period. The proposed ballast can actually operate in continuous-conduction mode to keep zero-voltage switching achieving a high power efficiency up to 90%. High lighting efficiency 20% more than that of the traditional ballast is also achieved. The fluorescent lamp is capable of obtaining wide dimmer range between 100% and 0% of the full luminance.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2009.2014065