Looking to build a transient generator

On Oct 8, 2:12 am, "Phil Allison" <philalli...@tpg.com.au> wrote:

 "Tim Wescott  PIG ARROGANT  Fuckwit "



** The OP, like many who post here,  did NOT need his idiotic Q answering
in the  LITERAL  way  ASD fucked morons like  YOU  always do..

Hells bells and little birdies,

** What a  fucking  ARSEWIPE  you are  -   Wescuntt.

He needs to think of another way to do his test.

Sometimes,

** What is sometimes the case is not  THIS  time !

All you ever SPEW is irrelevant &  IRRATIONAL   SHIT  !!

 I'm willing let him use _his_ judgment as to whether he's taking the
right approach,

**  Spoken like a completely narcissistic  FOOL.

All you are Wescuntt is a  CLUELESS   TWAT

  dishing out  100 %  STUPID   advice.

YOU  need to get a brain transplant  -  even a  DEAD  chimp's brain would be
 an improvement.

Piss off  -  TURD  BRAIN  !!!

......  Phil

Gentlemen. May I ask why this thread has turned into nothing but one
big pissing match? It seems you don't have much respect for each
other. That is OK. But please take the arguement elsewhere.

Thank you,

Gerb

 

On Oct 8, 1:40 am, Tim Wescott <t...@seemywebsite.com> wrote:

Gerbermultit...@gmail.com wrote:
On Oct 6, 12:23 pm, Tim Wescott <t...@seemywebsite.com> wrote:
Gerbermultit...@gmail.com wrote:
A product I am designing requires a series of lab tests to judge
robustness against electrical transients.
One such test is to charge up a 100mH inductor in series with a 4 ohm
load (4ohm load to ground).  Then, once the inductor is fully charged,
open the supply current to it from the high side.  The resulting field
collapse will produce a substantial negative going voltage spike.
The circuit goes V+ to switch to inductor to resistor to ground.
The DUT is placed in parallel with the inductor/resistor series
combination, at the open end of the circuit once the switch is opened..
My question:  I want to prolong the duration of the pulse by a factor
of 10x to create a more destructive burst of energy.
E=.5*L*I^2
I want to keep DC current through the branch the same.  With that
said, one would reason I would need to bump up my inductance by a
factor of 10.  This would require a 1H inductor!
Is it practical to find such a large inductance?  Any ideas?
Thank you
Gerb
What sort oftransientvoltages do you foresee?  Could you get by with a
HV supply and a controller, or is that cheating?

--

Tim Wescott
Wescott Design Serviceshttp://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details athttp://www.wescottdesign.com/actfes/actfes.html-Hide quoted text -

- Show quoted text -

I want to create a -400V transient (switching the inductor high side)
with a time contant of approximately 10mS.  I have the option of
taking this to a local EMC lab that has the capability of generating
this pulse.  However, I might want to run a few hundred products
through this test.  EMC lab time is expensive.  For reasons I would
rather not go into, I'd like to do this "on the cheap side".  Thus,
building my own equipment from scratch and surplus bits.

I found two companies willing to construct inductors for me.  The
problem, the cheaper of the two wanted $2500USD.  I currently don't
have that type of budget.  I assume the solution you mentioed above
(High voltage supply and controller) will cost even more.

Thank you,

Gerb

The opinion of certain vulgar individuals notwithstanding, I still think
it's worth looking into kit-bashing a transformer.  For $2500 you can
spend a considerable amount of time rebuilding and rewinding a surplus
core and still come out ahead.

I'd look to the coils that Hammond sells purely for the purpose of
getting a weight vs. energy number, then think about (a) whether I want
that big of a lump of steel cluttering up my shop, and (b) where in heck
I could get a core that big for cheap.

Come to think of it, why look for one great gazonga of a thing, when you
can build it yourself out of smaller chokes?

Just from the Antique Radio Supply catalog, I see that you could put
together 10 10H x 500mA chokes in parallel for a 1H, 5A choke.  It'd
weigh 210lbs less your frame, and cost you 10 x $68.45.  That's a heck
of a lot less than your $2500.  Hammond also has a 100mH, 5A, 14lb choke
(the 195T5) that you could string in series, but Antique Radio Supply
doesn't list it (and if you're getting 10, you'd be better off getting
it straight from Hammond anyway).

Check to make sure you're not getting a "swinging" choke, unless a
swinging choke is what you want.

--

Tim Wescott
Wescott Design Serviceshttp://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says..
See details athttp://www.wescottdesign.com/actfes/actfes.html- Hide quoted text -

- Show quoted text -

Thank you. Now this is more inside my budget .

Gerb