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Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 25 Apr 2024 21:42:09 +0000 From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> Newsgroups: sci.electronics.design Subject: Re: CCFL transformer Date: Thu, 25 Apr 2024 14:40:18 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: <vbjl2jp2uu3s9eeq3c1iqlj25ht30lujqn@4ax.com> References: <v09htg$1tjdf$2@dont-email.me> <66rk2jl35lbgd2tnqc6jjoqsd70ig9d485@4ax.com> <v0egrm$12n1s$1@gonzo.revmaps.no-ip.org> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 49 X-Trace: sv3-ff18UIxXWlLtl+WDXKCsH3O+zyWZE+xhO/KI7CHoG+g4eQDEtTirmwHN3CQyrao1xYlauGRVCIDjVly!H6jtImlH6/lt606efzkzeWatnKDrZ382jLs9dagX+bEdplw8aMgrMYNf8KWuo2xUr0gInepSRukg!gHEYQg== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2751 On Thu, 25 Apr 2024 21:10:14 -0000 (UTC), Jasen Betts <usenet@revmaps.no-ip.org> wrote: >On 2024-04-25, legg <legg@nospam.magma.ca> wrote: >> On Wed, 24 Apr 2024 01:57:36 +0200, Klaus Vestergaard Kragelund >><klauskvik@hotmail.com> wrote: >> >>>Hi >>> >>>I need a low distributed capacitance winding transformer, for a HV >>>stepup function (3.5kV) >>> >>>I am zeroing in on similar concept as CCFL transformers with >>>sectionalized bobbin. >>> >>>For example: >>> >>>https://www.coilcraft.com/en-us/products/transformers/power-transformers/ccfl-transformers/fl/ >>> >>>Possibly using Triple Insulated Wire to create some distance between the >>>individual turns. >>> >>>Not many sells CCFLs these days. >>> >>>Guess I will keep it alive.... >>> >>>Regards >>> >>>Klaus >> >> Stress between turns is limited by v/n limit of core. It's layer >> stress and section stress that you have to deal with. >> That's what the multisection bobbin and pancake windings do. >> >> If the CCFL transformer will allow only 1600V, imagine the >> precautions required for 3x that stress. I'm not sure you >> can avoid vacuum impregnation / potting in anything 'small'. > >I see trandformers claimed for 15kV with 6 sections of loose wound >magnet wire. This is however Chinese consumer marketing kilovolts. > >https://www.aliexpress.com/item/1005002225061453.html > >Given the ~2mm spark gap it suggests something less than 15kV How dinky. This one is 400 KV. https://www.amazon.com/AEDIKO-Voltage-Generator-400000V-Transformer/dp/B09L18GG2Z