Re: EDM design

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "milespaul2004"
<milespaul2004@y...> wrote:

> Hi.
> Can anyone help.
> I have almost finished building a small spark erosion machine to

use

> in my home Model Engineering workshop. I am have a finished but

basic

> prototype working but I wish to modulate the voltage with a PWM
> signal and I am having some difficulty in getting output stage to
> work.
> I want to use an IRG4PC50KD IGBT to control the 70V DC 30A output.
> Radio Spares Technical said no driver was required but after

several

> failures (I only have four IGBT's left), it seems now that I do
> require a driver circuit but cannot find a great deal of

information

> on them. IXYS do a paper on IGBT drivers and show a device IXDD414
> with what looks like a simple and ideal circuit but there's the

rub.

> I can not find a supply of IXDD414's unless I wish to puchase 1000
> plus and quite frankly I don't have the cash or inclination to do

so.

> There must be someone amongst you clever guys out there who can

help

> me out.
> Has anyone seen a suitable circuit in a book they have if so could
> they email it to me. I want to get this damn machine working for I
> have numerous small jobs for it to do.
>
> Regards
> Paul Miles
> UK

Visit the digi-key website and put in mosfet driver and start to
follow the forms.

There are a few listed on their site.


Also, there are a lot of mosfets out there and you may be able to
find something that will operate on the TTL levels and not need such
a high current to turn on.

I would reccomend that you try some other mosfets in the event you
cannot get these to work.


Dave