Inverter

Are you talking about a cfl inverter/ballast or a dc to ac inverter for operating ac equipment on dc?

You say "to line is no pobs"? It sounds like your lamp already has an inverter.

Not completely understanding you quest, I can only suggest this link as possibly helping you:

http://www.tradeindia.com/suppliers/cfl-inverter.html

no its not cfl inverterits juz an ordinary inverter,for any 40W tubelight.

It may be that your inverter is faulty (whether it works on other equipment is an unknown).

It may be that your inverter output is not "clean" enough for the cfl (requiring pure sine wave).

but it can make a 40W tubelight to work

Hope your CFL is not faulty, it must work. If ordinary T/L working (with normal inductive choke) then there should be no problem with CFL. Some times I use CFL on my PC - UPS without any problem but I can not use ordinary T/L as such UPS gives lot of DC component. All CFL s got inverter circuit in side the cap. In-put AC is converter to DC and again inverted to AC to light a CFL.

GA for a good answer.

I think the problem is that the inverter (probably 12 volts in) is designed only to light flourescent tubes at a very high frequency, which it does.

It was not designed to supply say 230 (or 110) volts AC at 50 (or 60) HZ....which it does not do!!

The CFL's electronics may be still OK, but they were never designed to work at high AC frequencies.....BUT, most of them will run off DC, so if you can boost the battery with either a DC to DC inverter, to either 120 or 220 VDC or an AC inverter at 50 or 60 HZ, then I think you may find that the CFL will work just fine!!!!

He should look at the inverter he has with an oscilloscope to see what the frequency is!(usually you can "hear" the frequency of such simple inverters that I believe he has, which precludes it being 50 or 60 HZ being generated!!!

With the explanation you given, couldn't find any particular reason for the CFL to work in line, but not in inverter. Yet, the inverter lights tubelight! The difference with CFL, is the low power factor and it makes harmonics. Not sure, the inverter blocks for these two parameters. Better, you to discuss with the manufacturer of the Inverter.

Why do you want to run a CFL, its efficiency is probably no better than the fluorescent tube and the inverter you have that actually works.....

Whats your thinking on this matter please?

<<< a 40W tubelight >>>> is almost 4' long works near 50/60 Hz [Quazi-Sinewave] while CFLs may need clean sinewave as you say on Line no problem

how can i overcome this problem,to get pure sine wave?

Make a proper inverter for either 50 or 60 HZ at the voltage required....

Padupoi,

CFL lamps come in two styles--those with a ballast built into the base (for use as replacement lamps) and those that plug into a base supplied with power through a separate ballast. I assume that you are talking about the CFL with a built in ballast. Nearly all of those that are sold are made as inexpensively as possible, and are not capable of operating on a voltage supply that is not a high-quality sine wave AC. They will have a warning that they cannot be used on dimmers (and cannot be used on photocells, etc.). If you can find a CFL that is designed for use on dimmers (they are made and marketed at a higher cost), this one will probably work OK on your inverter's output.

--JMM

Do not forget that calling the high efficiency (and complicated) electronics a "Ballast" is really not correct.

You should at least call it an "Electronic Ballast" to differentiate it from the ballasts used in such a circuit as this for many, many years:-

A preheat fluorescent lamp circuit using an automatic starting switch.
A: Fluorescent tube, B: Power (+220 volts), C: Starter, D: Switch (bi-metallic thermostat), E: Capacitor, F: Filaments, G: Ballast)

I found this at:-

http://en.wikipedia.org/wiki/Fluorescent_lamp#Ballast_electronics

Which has a lot of other pertinent infos as well!!

You can see that the ballast is just a choke, nothing more, nothing less.....no electronics involved.

The electronics (Ballast) were designed to work on an AC Voltage at ether 50 or 60 HZ only, not the high frequency used of many Tube inverters on 12 volts DC......

Some (as I previously mentioned) will work on a DC voltage of around the same voltage. Why? you may ask. Well its really simple as the lamp really needs DC for the electronics, so the 60 or 50 HZ goes first through a full wave rectifier, producing what I was taught to call "Lumpy DC"......

Though as I am not informed of all the possible design methods, you would have to test a bulb on DC first to know if it would work or not!!!

Here is a link to a small 12 volt Fluorescent Tube driver, typical of its type:-

The frequency of the 555 is around 12 KHZ with R2 at 5KOhms and it goes up to 22 KHZ at 2.5 KOhms.....nothing like 50 or 60 HZ!!!!