Solid state device for lighting fluorescent tubes in emergency

Details Solid state device for lighting fluorescent tubes in emergency Solid state device for lighting fluorescent tubes in emergency

H - Electricity

05

B

315/23

H05B 41/285 (2006.01) H02J 9/06 (2006.01)

Patent

CA 1074851

SOLID-STATE DEVICE FOR LIGHTING FLUORESCENT TUBES IN EMERGENCY ABSTRACT OF THE DISCLOSURE A device for lighting fluorescent lamps in emergency comprises a push- pull oscillator whose transistors act as an on-off switch to obtain a square wave a.c. voltage from a d.c. source. This a.c. square wave is transformed into various voltages by using a tapped secondary winding on the oscillator transformer. Two small sections of this secondary winding feed the filaments of the tube and a larger section sandwiched between the above two provides the operating voltage for igniting and maintaining the discharge in the fluorescent tube. The remaining portion of the secondary winding is cap- acitively connected to the centre of the primary winding which aids starting of the lamp. The d.c. source is charged by a regulated charger which main- tains the battery fully charged (without overcharging) under normal power supply conditions. A control device substitutes the use of an electro- magnetic or solid-state relay by keeping the oscillations damped whenever the normal power supply is not interrupted.

297880

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