Ballast unit for gas discharge lamps such as fluorescent tubes o

Details Ballast unit for gas discharge lamps such as fluorescent tubes o Ballast unit for gas discharge lamps such as fluorescent tubes o

1974-03-14

1976-04-06

Demeo, Palmer C.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Transformer in the condenser load device circuit

315DIG5, 315254, 315257, H05B 4116

Patent

active

039492680

ABSTRACT:
The disclosure relates to a ballast unit for gas discharge lamps, particularly fluorescent lamps, by which a substantially constant burning current is supplied to the lamp. The ballast unit includes a transformer mounted on a core having a defined air gap. The transformer is provided with a leakage inductance having a value resulting in a voltage drop of between approximately 15 and 30 percent of an input voltage applied thereto. One or more capacitors are connected in series with the transformer output supply to the lamp. The one or more capacitors provide a capacitance in series with the lamp substantially equal to the ratio of the burning current to the angular frequency of the input voltage multiplied by the secondary no-load voltage supplied to the secondary circuit.

REFERENCES:
patent: 2510209 (1950-06-01), Bridges
patent: 2629072 (1953-02-01), Nathanson
patent: 3287599 (1966-11-01), Feinberg et al.
patent: 3295015 (1966-12-01), Rosiak

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