High pressure sodium lamp ballast circuit

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

1982-06-01

1984-04-03

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

Circuit interrupter in the inductance circuit

315127, 315207, 315276, 361 35, H05B 4116

Patent

active

044410565

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 lamp is not conducting current.

REFERENCES:
patent: 4107579 (1978-08-01), Bodine, Jr. et al.
patent: 4207500 (1980-06-01), Dove et al.

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