High-pressure discharge lamp with pulsed inverter operating circ

Details High-pressure discharge lamp with pulsed inverter operating circ High-pressure discharge lamp with pulsed inverter operating circ

1991-11-01

1994-08-30

Yoo, D. Hyun

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Resistance in the condenser circuit

315241R, 315243, 315DIG7, H05B 4136

Patent

active

053431251

ABSTRACT:
To ensure ignition of a high-pressure discharge lamp, for example a metal vapor halogen high-pressure dicharge lamp which has an ignition circuit, and is operated by direct current from an inverter circuit controlled for pulse width modulation, current flow to the lamp is extended in time upon initial energization thereof so that an initial hot spot which forms on an electrode can remain hot to establish a stabilized arc. This extension of current flow can be obtained by an R/C circuit in parallel to the output or storage capacitor (C.sub.A) of the inverter circuit (FIG. 1) or by an NTC resistor (H) in series with the lamp, or by a resistor which is short-circuited by a relay contact as the lamp operates, or the like.

REFERENCES:
patent: 3777212 (1973-12-01), Mashimo
patent: 4647817 (1987-03-01), Fahnrich et al.
patent: 4730147 (1988-03-01), Kroening
patent: 4792887 (1988-12-01), Bernitz et al.
patent: 4866347 (1989-09-01), Huckolls et al.
patent: 4904907 (1990-02-01), Allison et al.
patent: 4914356 (1990-04-01), Cockram
patent: 5047695 (1991-09-01), Allen et al.
patent: 5059867 (1991-10-01), Herone et al.
"Zundung von Halogen-Metalldampfanlagen" (Ignition of Metal Halide Vapor ps) by H.-J. Fahnrich and H. Leyendecker, Fernsch-und Kino-Technik (Television and Motion Picture Technology) 1972, No. 8, pp. 279-282.

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