How do I make my HV chokes?

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: How do I make my HV chokes?
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Sat, 21 Feb 1998 22:50:49 -0600
• Approved: tesla-at-stic-dot-net

----------
From:  Greg Leyh [SMTP:lod-at-pacbell-dot-net]
Sent:  Saturday, February 21, 1998 12:53 PM
To:  Tesla List
Subject:  Re: How do I make my HV chokes?

Gregory R. Hunter wrote:


> What's an L-diode filter?

It's like an L-C filter, except with a diode 
in place of the C:

           + --CHG--+--RFC---
                    |
HVDC supply<        D        >to pri ckt
                    |
           - -------+--------

The diode clamps any negative excursions 
that make it back thru the RFChoke, thereby
protecting the CHarGing reactor.  Positive
excursions do not pose a problem, as they
are never higher than the HVDC supply.

It's much more effective at attenuating RF
than a standard L-C, and does not have any
self-resonant properties to worry about.
Both of my present coils use this scheme,
and the measured negative excursions stay 
well below 100V.


-GL

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