High power-factor electronic reactor for discharge lamps

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EP 1 345 311 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.04.2005 Bulletin 2005/15

(43)	Date of publication A2:
	17.09.2003 Bulletin 2003/38

(21)	Application number: 03005300.3

(22)	Date of filing: 11.03.2003

(51)	International Patent Classification (IPC)⁷: H05B 41/24, H05B 41/282

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
	Designated Extension States:
	AL LT LV MK RO

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Priority:

15.03.2002 IT MI20020564

(71)	Applicant: VLM S.p.A.
	20090 Buccinasco (Milan) (IT)

(72)	Inventors:
	Piacente, Luigi 20146 Milano (IT) Dal Santo, Ivan 20080 Calvignasco (MI) (IT)

(74)	Representative: Faraggiana, Vittorio, Dr. Ing.
	Ingg. Guzzi & Ravizza S.r.l. Via Vincenzo Monti 8 20123 Milano 20123 Milano (IT)

(54)	High power-factor electronic reactor for discharge lamps

(57) An electronic device for powering a fluorescent lamp (16) starting from a sinusoidal alternating voltage comprises a whole-bridge rectifier (12) which rectifies the alternating voltage, a circuit (13) for processing the rectified voltage connected in parallel to the output of the rectifier (12) and a half-bridge inverter (14) with an output (D) for high frequency powering of the lamp (16). The processing circuit has a direct voltage output (A-C) at the ends of a bulk capacitor (CB) connected in parallel to the output of the rectifier (12) through a first diode (DP). A resonant network (17) to which is connected the lamp (16) is connected between the output (D) of the half-bridge inverter (14) and an intermediate point (B) of a series of two capacitors (CP1,CP2) connected in parallel to the output of the rectifier (12). The circuit allows obtaining with simplicity a power factor near unity and a limited lamp current crest factor.

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