Re: HV Choke Design (fwd)

---------- Forwarded message ----------
Date: Mon, 19 Jan 1998 18:15:15 +0000
From: Gwyn Zucca <gwyn-at-tcbod.demon.co.uk>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: HV Choke Design (fwd)

In message <Pine.LNX.3.95.980118142036.29558R-100000-at-pupman-dot-com>, Tesla
List <tesla-at-pupman-dot-com> writes
>---------- Forwarded message ----------
>Date: Sun, 18 Jan 98 16:01:17 -0500
>From: Adam <absmith-at-tiac-dot-net>
>To: Tesla List <tesla-at-pupman-dot-com>
>Subject: Re: HV Choke Design (fwd)
>>I used small cores which were originally commercially wound common mode
>>mains suppression chokes, removed all the wire and bobbin to just leave
>>the ring core. These cores are of the right material for RFI suppression
>>use (Generally Mn/Zn ferrite of a high permeability). These type of
>>chokes can be obtained as surplus for very little money! 
>Your main enemy will be saturation.  The small cores work fine as common 
>mode chokes, since the flux from 60Hz current in each winding cancels the 
>flux of the other (zero net flux).  In tesla use, they are no longer 
>common mode chokes, and it will take very little 60Hz current to saturate 
>these small high-permeability cores.
>I would only expect these chokes to function adequately on the smallest 
>of coils (e.g. an OBIT powered coil)

Hi There,

I tried looking up these types of cores in the RS catalogue, and they
seem to indicate that the core material can handle high flux densities.
What about when they are used in differential mode?


Gwyn Zucca (UK)