Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2007-12-04
2007-12-04
Chen, Shih-Chao (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Reexamination Certificate
active
09948994
ABSTRACT:
In order to achieving wide dimming range for compact and tubular fluorescent lamps, two novel control approaches are proposed. (i) Novel techniques for suppressing oscillatory effects in the Triac circuit so as to maintain stable Triac operation over a wide firing angle range and (ii) a hybrid dimming control technique in the ballast inverter circuit for achieving wide dimming range from 100% to about 3%. Concerning point (i) both dissipative and non-dissipative energy absorption schemes (EAS) are proposed to suppress the transient effects in the Triac circuit when the Triac is turned on. The essence of the EAS is to ensure that the Triac circuit can be operated in a stable manner without oscillations or inadvertent turn-off. With respect to pint (ii) a hybrid dimming method is proposed in which unlike traditional control methods that use inverter frequency control only for dimming purposes, both dc link voltage and inverter frequency are varied. The essence of the new dimming control is to reduce the range of the inverter frequency variation so that the overall dimming range can be made as wide as possible.
REFERENCES:
patent: 4926097 (1990-05-01), Taek
patent: 4998045 (1991-03-01), Ruby
patent: 5396155 (1995-03-01), Bezdon et al.
patent: 5422547 (1995-06-01), Brownell
patent: 5604411 (1997-02-01), Venkitasubrahmanian et al.
patent: 5636106 (1997-06-01), Batarseh et al.
patent: 5994848 (1999-11-01), Janczak
patent: 6078147 (2000-06-01), Arts et al.
patent: 6144169 (2000-11-01), Janczak
patent: 6172466 (2001-01-01), Ki et al.
patent: 6208088 (2001-03-01), Konishi et al.
patent: 6351080 (2002-02-01), Birk et al.
patent: 6433493 (2002-08-01), Ilyes et al.
patent: 6486616 (2002-11-01), Liu et al.
patent: 6545431 (2003-04-01), Hui et al.
patent: 6597127 (2003-07-01), Takahashi et al.
patent: 1 164 819 (2001-12-01), None
patent: 1 209 954 (2002-05-01), None
patent: 2 425 760 (1979-12-01), None
Janczak et al., “Triac Dimmable Integrated Compact Fluorescent Lamp,”Journal of the Illuminating Engineering Society, pp. 144-151, Winter 1998.
Ki et al., “Phase-Controlled Dimmable Electronic Ballast for Fluorescent Lamps,”Proc. IEEE Power Electron, pp. 1121-1124, 1999.
Hui et al.., “An Electronic Ballast with Wide Dimming Range, High PF, and Low DMI”, IEEE Transactions on Power Electronics, vol. 16, No. 4, Jul. 2001, pp. 465472.
Hui et al., “An Electronic Ballast with Wide Dimming Range, High PF, and Low DMI”, IEEE Transactions on Power Electronics, vol. 16, No. 4, Jul. 2001, pp. 465-472.
Derwent Abstract Accession No. 2002-214177/27, Class X 26, TW 435057 A (Yang) May 16, 2001.
Chung Shu Hung
Hui Ron Shu-yuen
Lam Yiu Hung
Tang Pak Chuen
A Minh Dieu
Chen Shih-Chao
E. Energy Technology Limited
Merchant & Gould P.C.
LandOfFree
Phase-controlled dimmable electronic ballasts for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phase-controlled dimmable electronic ballasts for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase-controlled dimmable electronic ballasts for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3858719