new coil?

• To: tesla-at-pupman-dot-com
• Subject: new coil?
• From: Alan Sharp <AlanSharp-at-compuserve-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 17 Oct 1999 12:27:16 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Steve
Message text written by INTERNET:tesla-at-pupman-dot-com
>Now I have
>wound a secondary (4.5" pvc former) with 1000 turns of 26awg (actually
rather
>nice silver plated Kynar insulated). Problem is how much power can I put
into
>it?
Richard Hull used a similar coil in a magnifier at 9kW to throw 11 foot
arcs.
The problem though is that at that high powers it takes heroic efforts to
avoid
arcs shorting out the coil. I've used a similar coil 2ft winding of 0.4mm
wire at
2.5kW (4 foot arcs).

> I can easily build a solid state driver of several hundred kVA.
Do you mean several hundred VA or kVA - I suspect the former.

>Second question has anyone any experience of paralleling power FETs, as I
have
>a supply of IRF530s, which in short duty pulse applications can handle
100A+?

Yes they parellel quite nicely but you need sufficent drive current.
>If so are there any special precautions I need to take?<
Also at these large currents its very easy to generate hi-voltage spikes,
you need either fast fat diodes to take the spikes to the rails or a
snubber.
There's some stuff about this on my web page:
http://ourworld-dot-compuserve-dot-com/homepages/alansharp/

Have fun

Alan Sharp (UK)

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