how to drive a 15 watt CFL by means of a 6 volts 4,5 ah battery

[rajaram04]

hello sir
i want to drive a commonly available CFL (fluorescent lamp) of 15 watt by the means of a 6 volt 4.5 ah battery available in emergency lights . i searched it , but came to know about it only but couldn't find any circuit or unit . . .
All the available units are designed for 12 volts battery but my aim is drive it with 6 volts
please help me in designing it my own , is it possible or not please tell . . thanks

 

[Genovator]

Yes, it is possible. But your battery will drive the CFL for around 1 and half hour or little more. Is it okay???

Any simple inverter circuit will do, all you need is a 6v to 230v transformer.

 

[rajaram04]

ohh kk thanks a lot . . transformer is okk but ehat about other circuitry ? how to generate desired sine wave ?
by 555 etc i.c.s or some other implantations we need ? please elaborate if possible

 

[Genovator]

Is sine wave compulsory???? You can use square wave for the CFL. And it is easy to generate. Making sine waveform will be much complex and expensive...

 

[rajaram04]

ohh kk so how its possible for square to drive CFLs ? i mean u described about a 6v/230v transformer so is it find any use then ? please explaain what to design next & how . . thanks

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i mean how can we design invertor of our own , please if possible would u hv me a block diag.

 

[Genovator]

This is a very simple inverter... https://www.eleccircuit.com/12v-to-220v-inverter-180w-by-2n3055/

You have to find a transformer of 220v to (6v - 0v - 6v), center tap and of more than 15W. The 0v is the centre.

In this inverter, BC549 with the RC network are used to make a vibrator, i.e., the 50Hz pulse. 2N3055 are the power mosfet and should be connected with heat sink. If you can't find a particular transistor, you will get a substitute of it.

 

[rajaram04]

okk got it
but the link u provided here has a circuit diag.running on 12 volts & using related transformer too . so is that possible to replace battery source & transformer with desired one ? is dere any change in circuitry for that case ?

 

[Genovator]

You can change the values of R2, R3, R6 & R7 to 120R or 130R. Its not so compulsory.
Batteries and transformer will be changed. Battery 6v, and transformer as mentioned.

 

[rajaram04]

hmm i see , k you mentioned transformer above 15W so how it matters for the total design ?
i mean if in case i am unable to get that or aomething happens , then what to do ?

 

[Genovator]

Your CFL is of 15 Watt, so you need a transformer which can deliver the power more than 15W. Say the efficiency of the circuit & transformer is 70%(for safe operation). Then the wattage of transformer will be 18.75W or 20 watt in common values.
You can't use any lesser value, but any higher value can be used.