Power supply apparatus for a discharge lamp, especially for a mo

Details Power supply apparatus for a discharge lamp, especially for a mo Power supply apparatus for a discharge lamp, especially for a mo

1999-03-25

2000-06-13

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315276, 315DIG5, G05F 100

Patent

active

060753277

ABSTRACT:
A power supply circuit for a discharge lamp, in particular for a motor vehicle headlight, provides pulse starting. The circuit comprises a DC to AC converter giving an AC output at its secondary winding, together with a starting circuit which includes a transformer having a secondary winding in series with the discharge lamp. The apparatus further includes a branch which is connected in parallel with the secondary winding of the starter circuit transformer. At the frequency prevailing when an arc has been established in the discharge lamp, this branch has an impedance which is less than that of the secondary winding, so that the current then flows mainly in this branch.

REFERENCES:
patent: 4220896 (1980-09-01), Paice
patent: 4695771 (1987-09-01), Hallay
patent: 5495405 (1996-02-01), Fujimura et al.
patent: 5677602 (1997-10-01), Paul et al.
patent: 5726537 (1998-03-01), Huber et al.
patent: 5825139 (1998-10-01), Nuckolls et al.
patent: 5900701 (1999-05-01), Guhilot et al.

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