Discharge-lamp ballast in particular for a vehicle headlight

Details Discharge-lamp ballast in particular for a vehicle headlight Discharge-lamp ballast in particular for a vehicle headlight

2008-03-04

2008-03-04

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C307S010800

Reexamination Certificate

active

11334111

ABSTRACT:
Ballast comprising input terminals receiving a DC voltage coming from a supply source on the vehicle, a chopping supply circuit functioning at a predetermined chopping frequency in order to supply as an output a voltage supplying the discharge lamp, and a filtering device disposed at the input and intended to reduce radio interference produced by the chopping supply circuit. The chopping supply circuit comprises at least one first filtering capacitor connected between the input terminals and a filtering choke connected in series between one of the input terminals and the chopping supply circuit. In accordance with the invention, the ballast comprises a filtering device which also comprises at least one second filtering capacitor in series with an additional choke. This second capacitor forms with the additional choke a resonance circuit situated between the input terminals and tuned to the chopping frequency.

REFERENCES:
patent: 5036256 (1991-07-01), Garrison et al.
patent: 5313142 (1994-05-01), Wong
patent: 5541482 (1996-07-01), Siao
patent: 5552976 (1996-09-01), Munro et al.
patent: 6337800 (2002-01-01), Chang
patent: 6556463 (2003-04-01), La Dret et al.
patent: 7061345 (2006-06-01), Misu et al.
patent: 1 484 201 (2004-12-01), None
patent: 2 703 555 (1994-10-01), None
DIALOG Abstract of FR 2 703 555.
Search Report for corresponding French Application 05 00 486.

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