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'[EE]: mystery transformer'
2002\08\28@101942 by Scott Touchton

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Hi folks,

I have a mystery pulse transformer I am trying to identify.  It has a part number IPL-1032-22.   Does anyone recognize this part number?  I was hoping to locate the manufacturer.

Thanks,

Scott F. Touchton

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2002\08\28@220815 by Roman Black

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Scott Touchton wrote:
>
> Hi folks,
>
> I have a mystery pulse transformer I am trying to identify.  It has a part number IPL-1032-22.   Does anyone recognize this part number?  I was hoping to locate the manufacturer.


What is it from? Any more info? :o)
-Roman

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2002\08\29@121006 by Scott Touchton

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Hi Roman,

It is out of a dog collar.  Basically takes 7 volts stored in a 470uf cap
and converts it to 300 volts on the forward pulse for 250us (10K load) and
can create 12Kv for 20uS on the flyback into 10meg shunted by 2pf.  I am
guessing it is probably around 100:1 on the turns ratio (the forward pulse
losses look about right), but wanted to find out the primary and secondary
inductances and I DON'T HAVE AN IMPEDANCE BRIDGE!!!! (a little frustration)

I guess I'll just have to charactize it the old fashion way... spectrum
analyzer and tracking generator.  Should get me close.  But I would love
just to call the company, get the parameters and ask them to wind them for
me (or buy the same transformer for my application... a better dog collar!)

Scott
{Original Message removed}

2002\08\29@130810 by Peter L. Peres

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On Thu, 29 Aug 2002, Scott Touchton wrote:

>Hi Roman,
>
>It is out of a dog collar.  Basically takes 7 volts stored in a 470uf cap
>and converts it to 300 volts on the forward pulse for 250us (10K load) and
>can create 12Kv for 20uS on the flyback into 10meg shunted by 2pf.  I am
>guessing it is probably around 100:1 on the turns ratio (the forward pulse
>losses look about right), but wanted to find out the primary and secondary
>inductances and I DON'T HAVE AN IMPEDANCE BRIDGE!!!! (a little frustration)

So build one. Do you have a signal generator (audio to a few 100's of
kHz) ?

Peter

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2002\08\29@141251 by Scott Touchton

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Yup... and that is what I will do.  But I do have some questions dealing
with the permeability of the core, and if it is gapped.   I should be able
to spot this in the leakage inductance though.  But the true magic is in how
they can sustain 12Kv without being vacuum potted.

I would really love to talk to the manufacturer.....
{Original Message removed}

2002\08\29@144715 by Peter L. Peres

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On Thu, 29 Aug 2002, Scott Touchton wrote:

>Yup... and that is what I will do.  But I do have some questions dealing
>with the permeability of the core, and if it is gapped.   I should be able
>to spot this in the leakage inductance though.  But the true magic is in how
>they can sustain 12Kv without being vacuum potted.

No magic, just potting. color monitor fbt's provide 25kV dc from less than
2 cu.inches without problems. A photoflassh contains a tiny tiny pulse
transformer that does 6-8kV without problems. This is not so hard. I once
made ignition coils for small model engines and besides removing air from
the things and keeping the thin wire in one whole piece over 10,000 turns
there were no problems. My coil was the size of a AA battery but shorter.
I boiled it in transformer oil instead of potting (not really boiled,
just heated for a long time to ~150C).

Breakdown in air is about 1mm/kV at the range of voltages you are
contemplating so it should be do-able within 13mm^3 without potting. With
potting the theoretical limit could be ten times lower per side (1000
times less in volume).

Peter

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