Re: high voltage boost DC/DC converters (5V->250V)


"Michael" <nleahcim@xxxxxxxxx> wrote in message
news:db489e6b-9369-4720-8642-6f5b9b1f84f9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Nov 29, 6:24 pm, Winfield Hill <h...@xxxxxxxxxxx> wrote:

Small smps transformers are very easy to wind.

Here's what I designed for a similar need about
12 years ago. I used an LT1172 switcher IC in
a miniDIP package.

My technician wound the transformer bobbin.

I used an RM8 core with 3B7 material, gapped
(on one side) for A160 (A_L = 160nH/N^2).
The primary was 10 turns of #24 magnet wire
(for L = 25uH), then a layer of tape, and
the secondary was 100 turns of #30 wire.
So you can see it was easy to wind.

Hi Winfield - so is the standard path to wind your own for prototypes,
then have a custom transformer wound when you hit production? I had
been hoping to find a readily available transformer (as my quantities
will never be high enough to warrant a full custom run of
transformers, but will be high enough to make me scared at the thought
of hand winding all of the buggers). Thanks!

-Michael

Electronic photo flash units commonly work off 3 or 6 volts, and deliver
several hundred V DC. You should be able to find a schematic for such, or
even fix a junked flash unit; maybe from a disposable single use camera.

Tam


.

Relevant Pages

  • Re: high voltage boost DC/DC converters (5V->250V)
    ... Small smps transformers are very easy to wind. ... My technician wound the transformer bobbin. ... The primary was 10 turns of #24 magnet wire ... then have a custom transformer wound when you hit production? ...
    (sci.electronics.design)
  • Re: Audio Cyclopedia - A highly recommended book
    ... Hammond ain't the cream though. ... Feel free to wind anything you fancy at my website such as OPT No1. ... Visit any transformer plant winding stuff under 25 lbs. or so piece ... Not many women worked in the design offices afaik. ...
    (rec.audio.tubes)
  • Web Site Says Information Not Found in RDH 4. (Ahem).
    ... Just about everywhere there's AC you'll find a power transformer ... volt filament transformer as a source of operating voltage. ... wind 500 turns of No. 28 enameled wire in even layers ... loop for tap 2, then wind 500 more turns for tap 3. ...
    (rec.audio.tubes)
  • Re: Audio Cyclopedia - A highly recommended book
    ... Hammond ain't the cream though. ... Feel free to wind anything you fancy at my website such as OPT No1. ... Visit any transformer plant winding stuff under 25 lbs. or so piece ...
    (rec.audio.tubes)
  • Re: Jacobs Ladder
    ... diameter. ... no wind etc but its also alot safer should it fall over. ... Still not sure what to do about the transformer though. ...
    (sci.electronics.basics)