Re: HV DC supply design

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Just for refrance information I measured my 1 k 100w wire wound resistors to
have a Q 0f .002, 276 uH inductance when used as a RF choke. Hope this helps
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Wed, 30 Jan 2002 12:10:44 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: HV DC supply design
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Wed, 30 Jan 2002 12:24:51 -0700
> 
> Original poster: "Richard Williams by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> <richardwwilliams-at-earthlink-dot-net>
> 
> Dwight,
> 
> Thanks for your replies!
> 
> quote:
> "I would not feel safe until I had verified the voltages across all the
> capacitors as substantially equal, however."
> 
> Will do.
> 
> quote:
> "There are some excellent HV/RF isolation references and examples in the
> archives if this supply is to power a TC."
> 
> Yes, it is for a TC and I've been following the isolation issue closely.
> Steve Young has done a lot of work in this area as well as in triggered
> gaps. Some of the ideas for isolation I'll definately try as RF wouldn't be
> good for the electrolytics. One idea was using low ESR caps, about 1/10
> value, in parallel with the main filter caps but I haven't yet found them at
> a reasonable price.Low ESR caps at 56uf -at- 400v can be very costly and so is
> any string to acheive 0.56uF -at- 40Kv with low ESR.
> 
> Experiments with isolation and triggered gaps will be carried out at a lower
> power and in a safely prepared area using only an NST or two. If failure
> occurs I'd like to keep it to a minimum. I've seen many electrolytic
> failures in other fields of electronics and some can be quite, ummm,
> impressive. :)
> 
> I believe it's the electrolytics that may be the weakest link. Large HV oil
> caps MAY help here for filtering and resistance to the effects of RF.
> 
> Rick W.
> Salt Lake City
> 
> 
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Wednesday, January 30, 2002 8:25 AM
> Subject: Re: HV DC supply design
> 
> 
>> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Dwight.Crider-at-regulusgroup-dot-com>
>> 
>> 
>> Rick,
>> Your checks were valid. I would not feel safe until I had verified the
>> voltages across all the capacitors as substantially equal, however. Your
>> ratings were conservative-good.  If you know the expected load and can
>> adjust your saltwater load to match, you might want to check the
>> temperature rise of the diodes, and transformer(s). If you were also
>> conservative in that area you should have no problems with conventional
>> loads. Tesla coils are another matter and HV/RF isolation is a complete
> and
>> separate issue. There are some excellent HV/RF isolation references and
>> examples in the archives if this supply is to power a TC.
>> 
>> Dwight Crider
>> 
>> 
>> 
>> 
> 
> 
>