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

H - Electricity

05

B

315/34

H05B 41/14 (2006.01)

Patent

CA 1217808

Abstract of the Disclosure 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 be- ing 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 im- pedance for the ballast circuit, a secondary impedance, a bi- metal strip for sensing the ambient temperature in the vicini- ty of the bulb, and a switch connected to the secondary impe- dance and actuated by the bi-metal strip, the switch being operable to decrease the impedance of the ballast circuit be- low 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.

453314

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