Ballast de-energizing circuit for high pressure metal vapor lamp

Details Ballast de-energizing circuit for high pressure metal vapor lamp Ballast de-energizing circuit for high pressure metal vapor lamp

1978-07-31

1980-06-03

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

315360, 361 94, H05B 4116, H05B 3703

Patent

active

042063850

ABSTRACT:
A circuit for protecting a ballast in a high pressure metal vapor, such as sodium, lamp system which includes means for interrupting the power supply to the ballast in the event that no current is flowing through the lamp, once the system has been energized. The circuit has automatic compensation for short interruptions and for the time which it normally requires for the lamp to ignite. The absence of current flow through the lamp is sensed and this information used to provide the protection.

REFERENCES:
patent: 2309711 (1943-02-01), Pearson
patent: 2760117 (1956-08-01), Van Ryan

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