Pulse circuit for gaseous discharge lamps

Details Pulse circuit for gaseous discharge lamps Pulse circuit for gaseous discharge lamps

1976-11-22

1978-05-30

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Inductance in the supply circuit

315200R, 315208, 315242, 315244, 315290, 315DIG7, H05B 41231, H05B 4130

Patent

active

040925650

ABSTRACT:
Circuit operating from a direct current source applies DC pulses to a high pressure sodium vapor lamp to improve the color rendition of the lamp. The circuit includes a first inductor, a diode and a capacitor connected across a DC source, and a second inductor, controlled thyristor switch and sodium vapor lamp connected in series across the capacitor, and a timing circuit for periodically turning on the switch at predetermined intervals. The circuit provides for charging the capacitor, commutating the controlled switch, and discharge of the capacitor to enable subsequent re-charging thereof, so as to povide the desired pulsed operation of the lamp. This mode of operating also provides for application of voltage to the lamp which is substantially higher than the supply voltage.

REFERENCES:
patent: 3555302 (1971-01-01), Nuckolls
patent: 3629683 (1971-12-01), Nuckolls
patent: 3890537 (1975-06-01), Park et al.
patent: 3919592 (1975-11-01), Gray
patent: 3953763 (1976-04-01), Herrick
patent: 3963945 (1976-06-01), Colyn

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