High frequency electronic control circuit for fluorescent lamps

(19)

(11)

EP 0 955 794 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.06.2001 Bulletin 2001/24

(43)	Date of publication A2:
	10.11.1999 Bulletin 1999/45

(21)	Application number: 99201358.1

(22)	Date of filing: 01.05.1999

(51)	International Patent Classification (IPC)⁷: H05B 41/29

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

(30)

Priority:

06.05.1998 IT MI980982

(71)	Applicant: Beghelli S.p.A.
	40050 Monteveglio, Bologna (IT)

(72)	Inventor:
	Beghelli, Gian Pietro 40050 Monteveglio (Bologna) (IT)

(74)	Representative: Fusina, Gerolamo et al
	Ing. Barzanò & Zanardo Milano S.p.A, Via Borgonuovo, 10 20121 Milano 20121 Milano (IT)

(54)	High frequency electronic control circuit for fluorescent lamps

(57) A high frequency electronic control circuit for fluorescent lamps or tubes (T, T1, T2), comprising a half bridge circuit (MP), formed by a couple of power switches (Q1, Q2) and by the related control circuit (DR), a voltage rectifier bridge (P), a resonance circuit (C-L), which supplies the electric current to the fluorescent tubes (T, T1, T2) and a synchronisation or control circuit (CC), which properly controls the switchover of the power switching means (Q1, Q2), according to the direction of the current in the resonance circuit (C-L).
Using the circuit configuration according to the invention, it is possible to obtain a significant reduction in the number of components with respect to the known art, thus substantially reducing the costs.

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