Circuit arrangement for operating a high pressure sodium lamp

Details Circuit arrangement for operating a high pressure sodium lamp Circuit arrangement for operating a high pressure sodium lamp

1992-02-11

1993-11-16

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315226, 315307, H05B 4129, H05B 4139

Patent

active

052627012

ABSTRACT:
The invention relates to a dimming circuit arrangement for operating a high-pressure sodium lamp L with controllable color temperature. The lamp is supplied with current pulses having a controllable duty cycle D. A change in the color temperature can be achieved through a change .DELTA.D in the duty cycle D and a simultaneous change .DELTA.P in the power supplied to the lamp, while the relation .DELTA.D/.DELTA.P>0 is satisfied.

REFERENCES:
patent: 4137484 (1979-01-01), Osteen
patent: 4485336 (1984-11-01), Yoshiyama et al.
patent: 5004349 (1991-04-01), Sato et al.

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