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: Mon, 23 Feb 1998 16:19:43 -0600
• Approved: tesla-at-stic-dot-net

----------
From:  Gregory R. Hunter [SMTP:ghunter-at-mail.enterprise-dot-net]
Sent:  Monday, February 23, 1998 1:54 PM
To:  Tesla List
Subject:  Re: How do I make my HV chokes?


> 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
> 
Thanks for the explanation.  This is fine for a DC power supply. 
Wouldn't do anything for someone trying to protect an NST or OBIT.  I 
can see how it would be great for clamping negative kickback, but how 
is it superior for attenuating RF?  The diode diverts RF better than 
a cap?

GH

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