Overvoltage protection for hid lamp ballast

Details Overvoltage protection for hid lamp ballast Overvoltage protection for hid lamp ballast

2005-07-19

2005-07-19

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S2090SC, C315S307000, C361S091100, C361S091200, C361S016000

Reexamination Certificate

active

06919695

ABSTRACT:
The present invention relates to a device for operating a high-pressure discharge lamp, comprising a switched mode power supply circuit (SMPS) for supplying power to the high pressure discharge lamp from a supply voltage, the power supply circuit comprising a half bridge commutating forward (HBCF) circuit including an inductanceimg id="CUSTOM-CHARACTER-00001" he="3.13mm" wi="1.78mm" file="US06919695-20050719-P00900.TIF" alt="custom character" img-content="character" img-format="tif" ?(Lhbcf?), a capacitor circuit of a first capacitor (Cs1) and a second capacitor (Cs2) in series, the lamp (LA) being connectable between the inductance (Lhbcf) and a point (M) between the first and second capacitor (Cs1,Cs2); wherein overvoltage protection means are connected parallel to the lamp, which switch from an off-state with a high resistance operation to an on-state with a low resistance operation when the voltage difference across the protection means exceeds a breakover voltage (Vbo), the breakover voltage (Vbo) being selected to correspond to a predetermined maximum voltage across the first or the second capacitor (Cs1,Cs2).

REFERENCES:
patent: 5338110 (1994-08-01), Byun
patent: 5731667 (1998-03-01), Luchetta et al.

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