Ballast with braking inductance

Details Ballast with braking inductance Ballast with braking inductance

2006-10-31

2006-10-31

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Discharge control discharge device load

C315S276000, C315S282000

Reexamination Certificate

active

07129649

ABSTRACT:
A ballast for at least one lamp at least two switches arranged in series; a control circuit for alternately opening and closing the two switches; a connection for applying a supply voltage to the two switches; a resonant starting circuit coupled on the input side to the junction point between the two switches and on the output side to a first connection for the lamp, the resonant starting circuit having a resonant inductance arranged in series with the junction point between the two switches (S1, S2) and the first connection for the lamp, and a resonant capacitance arranged for alternating current purposes in parallel with the first and second connections for the lamp, a first braking inductance which, for alternating current purposes, is firstly arranged in series with the first of the two connections for the lamp and secondly in parallel with the resonant capacitance.

REFERENCES:
patent: 6459214 (2002-10-01), Chen et al.
patent: 2001/0020830 (2001-09-01), Rast et al.
patent: 2002/0041165 (2002-04-01), Cammack
patent: 2002/0050797 (2002-05-01), Lechner
patent: 2004/0257000 (2004-12-01), Langeslag
patent: 0 314 077 (1989-05-01), None
patent: 0 855 850 (1998-07-01), None
patent: 2 319 677 (1998-05-01), None
patent: 02/30162 (2002-04-01), None
patent: 03/024161 (2003-03-01), None
Euopean Patent Office Search Report (dated May 23, 2005; 3 pages total) for related European Patent Application No. 05 00 4716.

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