How to aliment the EL backlight of a 16*1 display?

inductor d32-49

Hello!

Can someone give me some infos on how to aliment the EL backlight of a 16*1 display? I know it need something like 100V @ 400 Hz but I can't find any schematic or reference for a composant that do the job. Thanks in advance,

d32-49 inverter

You need an inverter.

If you browse for the words "EL" and "inverter" you will find lots of information.
Unfortunately inverters tend to be expensive - especially considering how low tech
they usually are.

You should try and get one that has the right frequency for your EL panel - usually
that means 400 Hz. There are inverters for "EL wire", used by PC modders to
embelish their cases, but these seem to run at about 2000 Hz.
A higher frequency will make it brighter, but also shorten its lifetime.

The area of the EL panel is also a parameter that defines the inverter. The panel
is capacitive and forms a resonant circuit with an inductance in the inverter.
When properly matched the voltage over the panel should be close to sinusoidal.
A square wave voltage on the other hand, will shorten the panels lifetime due to its
harmonic contents. It might also cause an EMI problem.

/Rambo

nel-d32-49 el backlight

Hello!

Does it cost less to do the inverter with parts rather than buying an all done module? If yes, do you have a schemetic?

Re: EL Backlight for LCD

Hi!

The only component that is tricky is the inductor/transformer, but you can
wind one yourself - and there might be something suitable on the market.

I have the datasheet, including schematics, for an inverter lying around
somewhere. I will dig throught my piles of papers, but it might take a couple
of days, so don't hold your breath... :wink:

/Rambo

Re: EL Backlight for LCD

Well, I didn't find the schematics but i found an NEL-D32-49, which I dissected.
As I remember it looks the same as the lost schematics.

It seems to be some sort of self-oscillating design - I haven't bothered to analyse
it - there is probably room for improvement, but I guess this is the cheap way of
doing it.

This inverter is meant to supply an EL panel that is 50-83 cm2 in area.
The inductor is wound on the middle leg of an E core ferrite "transformer",
which total size is about 15x15x15 mm. I assume your EL is smaller, so you could
use a smaller "transformer".
The wire for the coils looks like being 0,1 mm, or slightly more, in diameter.

In the schematics I have given the resistance value for the windings - I tried to
measure the inductance, but I don't trust the readings from my "el cheapo"
inductance meter, so I will not give those.

Hopefully this will be of some help!

/Rambo

Re: EL Backlight for LCD

Hi

Use HV826 EL driver ic it's easy to use and have a 2nd source from micrel


search google for HV826 for DS


mosure electronics have it on stock


regards

Bobi