Path: Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sat, 27 Apr 2024 20:18:00 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: Re: CCFL transformer Date: Sat, 27 Apr 2024 13:16:07 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: <5gmq2j5gvem9pn5cf75qr63i9pf3p7g7ng@4ax.com> References: X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 53 X-Trace: sv3-CxKPRMtW+PEVyR6pVfwToDWvRqfq588zK5L5ftQ5SeRcAI8txkpYFW7Q5S8cGGL8ZxABeAZ/7K2/C/J!bPEdxet0qlbBweLrpNu91BF2PqsBa6WR2UpNIKm/1nUSiBzzjHS6Q7D/zgRrG5sG+TxtE8NV3u3k!s7TE2w== 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: 2987 On Thu, 25 Apr 2024 09:56:21 +0200, Klaus Vestergaard Kragelund wrote: >On 24-04-2024 07:10, Bill Sloman wrote: >> On 24/04/2024 12:25 pm, John Larkin wrote: >>> On Wed, 24 Apr 2024 01:57:36 +0200, Klaus Vestergaard Kragelund >>> wrote: >>> >>>> Hi >>>> >>>> I need a low distributed capacitance winding transformer, for a HV >>>> step-up 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.... >>> >>> Can you use a C-W multiplier? >>> >>> For low current, you can do resonant tricks too. >> >> It's easier to use a voltage doubler or tripler that it is to find a >> multi-section former off-the shelf. The occasional high voltage power >> supply that I've dismantled clearly used proprietary formers, as do the >> Coilcraft parts >> > >I am using it for pulse generation, so cannot use a capacitive doubler I expect that you can't push a decent-looking pulse through a CCFL transformer. Look at the pics on the Coilcraft page. Those things are probably designed to have a huge leakage inductance. That makes sense, since gas tubes are negative resistances. Of course, we don't know what kind of pulses you need. Some sort of Marx generator would be fun. My Pockels Cell driver uses a resonant boost thing with a SiC fet. It goes from 48v to 1400v in one step. https://www.highlandtechnology.com/Product/T850