Temperature sensitive ballast circuit for a fluorescent lamp

Details Temperature sensitive ballast circuit for a fluorescent lamp Temperature sensitive ballast circuit for a fluorescent lamp

1982-02-22

1984-05-29

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315310, 315106, 315107, H05B 4114

Patent

active

044517670

ABSTRACT:
A ballast circuit for a fluorescent lamp including a gaseous discharge light bulb which for a given input power produces a decreasing amount of light as the bulb temperature decreases below a designed operating temperature at which the amount of light produced is a maximum, the ballast circuit being adapted to be connected in series with the bulb and having a first impedance at the designed operating temperature. The ballast circuit comprises a ballast constituting a primary impedance for the ballast circuit, a secondary impedance, a bi-metal strip for sensing the ambient temperature in the vicinity of the bulb, and a switch connected to the secondary impedance and actuated by the bi-metal strip, the switch being operable to decrease the impedance of the ballast circuit below its first impedance if the ambient temperature falls below a predetermined temperature less than the designed operating temperature to increase the bulb current and thus the light output of the bulb, whereby the light output of the bulb is increased for ambient temperatures below said predetermined temperature.

REFERENCES:
patent: 2359545 (1944-10-01), Campbell
patent: 3445721 (1969-05-01), Waymouth
patent: 3921032 (1975-11-01), Hallay
patent: 4009412 (1977-02-01), Latassa
patent: 4178535 (1979-12-01), Miller
patent: 4208616 (1980-06-01), Moerkens

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