High pressure sodium lamp ballast circuit

Details High pressure sodium lamp ballast circuit High pressure sodium lamp ballast circuit

1980-06-05

1982-07-13

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315206, 315256, 315289, 361 35, H05B 4116

Patent

active

043396950

ABSTRACT:
A ballast circuit for limiting the kilovolt-ampere rating of a ballast required to operate a high pressure sodium lamp during starting, hot restart and lamp out conditions. The ballast circuit includes a voltage limiting or clamping circuit across the secondary of a ballast transformer which responds to the voltage level and the rate of change of voltage across the secondary to activate a switch during each half cycle that the secondary of the ballast transformer goes into saturation.

REFERENCES:
patent: 3727104 (1973-04-01), Neal et al.

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