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RE: [TCML] Sec design trade-offs and considerations
Hi Chris,
I did not know quite how you were using this but you have since clarified how it is being used.
All capacitors have some self inductance and it will form a resonant circuit with its own capacitance. This is the self resonant frequency of the component and can be measured.
Cheers,
Paul
Paul Benham
Senior RF Engineer
Ext: 235
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-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Chris Swinson
Sent: 27 November 2007 12:58
To: Tesla Coil Mailing List
Subject: Re: [TCML] Sec design trade-offs and considerations
Hi Paul,
Not sure what you are getting at with self res freq ? I don't know what it
is and doubt I would be able to measure it. The caps are supposed to have
zero L&R though think that's a bit of a lie in the datasheet as they must
have *some*.
They are all flat plate caps, over 200 of them in parallel. Any problems
there would probably be self inflicted with all the wiring, though they are
fixed between 2 large sheets of copper sheet and all kept as physically
close as possible. I can send you some images off list if needs be.
Chris
----- Original Message -----
From: "Paul Benham" <PaulB@xxxxxxxxxxxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Tuesday, November 27, 2007 10:44 AM
Subject: RE: [TCML] Sec design trade-offs and considerations
Hi Chris,
Have you measured your capacitors self resonant frequency?
Cheers,
Paul
Paul Benham
Senior RF Engineer
Ext: 235
Wood & Douglas Ltd
Lattice House
Baughurst
Tadley
Hants RG26 5LP
United Kingdom
Tel : +44 (0) 118 981 1444
Fax: +44 (0) 118 981 1567
www.woodanddouglas.co.uk
www.cofdm.com
This e-mail and any attachments are confidential and may contain information
that is legally privileged. If you are not the named recipient, or
responsible for delivering the message to the named recipient, you must not
disclose, distribute, forward, copy, store or use this e-mail or its
attachments in any form. If you have received this communication in error,
please accept our apologies and promptly inform the sender by e-mail or by
telephoning 0118 981 1444. Please also immediately delete this message and
any attachments from your systems.
Although this e-mail and its attachments have been checked by an up-to-date
virus-checking program before transmission, Wood & Douglas Ltd cannot accept
liability for any damage sustained as a result of software viruses that
maybe present.
Registered Office: Lattice House, Baughurst, Hants, RG26 5LP
Registration No: 2844692
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Chris Swinson
Sent: 24 November 2007 16:01
To: Tesla Coil Mailing List
Subject: Re: [TCML] Sec design trade-offs and considerations
John ,
>
> Chris,
>
> It sounds to me that you're planning to use the SCR to replace the spark
> gap. The tank will ring down while the SCR is turned *on*. The SCR will
> extinguish when the energy rings down sufficiently. If this is what you
> plan, it's not a new idea. I've used SCR's in this way in Tesla coils,
> Lou B. has done it, Malcolm W. has done that and probably others too.
> Terry's SISG coils use the same concept except he used an IGBT which
> is kept on during the transfer time. The overall concept being that the
> solid state
> device is not switched at the RF frequency, but rather at the break-rate
> frequency.
>
> John
>
True the SCR idea is not a new idea. You are correct in what you say. Though
whay should be a new idea is to use 2mhz high Q system and a 1,000uF tank
cap all at low voltage... If this has already been done before then I would
like to review the specs and data, would save me weeks of time in
development! I started this project about 8 months ago now :-(
Chris
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