Electronic ballast that drives four 15W fluorescent lamps (ideal for PCB UV exposure)

[ChocoHolic]

Originally posted by Eva
Anyway, since dimming conventional fluorescent lamps is so easy....

The basic idea is simple, but real life customer demands are sligthly higher.
Try to dim down to 1% of nominal lamp power without damaging the lamp... still showing stable light.... and ignite without visible flash ....all this in the temperature range of -25C...50C ambient +EMI+immunity+safety+handling all typical lamp failure modes+relamping feature+mass production suited design+reliability+costs.

[Eva]

Don't get the terms wrong, dimming a lamp is easy, keeping a paranoid customer or a handful of clueless government bureaucrats happy isn't

[apexaudio]

Hello Eva,
Do you have project for Electronic ballast that drives two 20W, or one 40W fluorescent lamps on 12V battery ?
Regards Mile

[Andrew Eckhardt]

The UC3871 is nice for that. I bought a few back when there was a Unitrode. Too bad they are still stupid expensive. I don't think that when it was designed they knew how severely the 2 transistor circuits would dominate the driving of these tubes. You could use any of the off-line ballast circuits you could find on the net if you were willing to stuff a step up converter in front of it. That would be a minimal design cost approach although not highest performance.

[apexaudio]

Originally Posted by Andrew Eckhardt

The UC3871 is nice for that. I bought a few back when there was a Unitrode. Too bad they are still stupid expensive. I don't think that when it was designed they knew how severely the 2 transistor circuits would dominate the driving of these tubes. You could use any of the off-line ballast circuits you could find on the net if you were willing to stuff a step up converter in front of it. That would be a minimal design cost approach although not highest performance.

Thank's,
I need highest performance. I tested some industial balast which use only descrite: no RF noise (sinus output), maximum efficiency and brightness and maximum realable.
Regards

[rajudp]

Eva,
can u please upload the eagle files and transformer windings
regards
raju

[apexaudio]

Eva don't read this thread anymore.

[rajudp]

anybody else having the file please share it

[Eva]

Eagle files and EPS back online

[masood]

dear sir
i want to make toner transfer ,for this what will the uv tube wattage and size,to transfer 15by 4 inches image on pcb clad board,plz help me,
thanking you