Timed ballast circuit for sodium vapor lamp

Details Timed ballast circuit for sodium vapor lamp Timed ballast circuit for sodium vapor lamp

1979-11-05

1981-03-24

LaRoche,, Eugene

Electric lamp and discharge devices: systems

Plural series connected load devices

Discharge device loads

315193, 315282, 315323, 315360, H05B 41231, H05B 4136

Patent

active

042582954

ABSTRACT:
A ballast circuit for driving a sodium vapor lamp includes a ballast transformer having a primary winding connected to a constant current power source. A secondary winding of the transformer is connected across the lamp. A high voltage oscillator responsive to the voltage across the lamp superimposes high voltage pulses across the lamp when the voltage across the lamp is above a predetermined level. A time delay circuit, triggered by the initial voltage across the primary winding when the power from the power source is turned on, opens a normally closed switch connected across the primary winding a predetermined time interval after the time delay circuit is triggered.

REFERENCES:
patent: 2853654 (1958-09-01), Swasey
patent: 3440520 (1969-04-01), Jones et al.
patent: 3609515 (1971-09-01), Babcock et al.
patent: 4097783 (1978-06-01), Hathaway

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