[Milsurplus] "Solid State Chokes"

[J. Forster]

I may have been a bit hasty.

There are two kinds of switching cnvertyers, buck and boost or step-down
and step up.

I'm certain the gyrators will not work in a boost converter. Suppose you
have a boost converter that puts out >2x supply. Where is that voltage
going to come from w/o the 'inductive kick' of the real inductor?

If you suddenly open-circuit an inductor carrying a current, the voltage
goes waaaay up. With a gyrator, the current goes to zero and the voltage
cannot get larger than was across the thing before the switch opened.

I'm less certain they won't work in a step-down converter.

-John

===========




> John, and All  -
> I may be wrong, by adding a Lytic to A. (across input to ground or B- )
> OR B. (across the input to output),  would this not provide the
> necessary energy storage ?
> I may add a question, what happens in a short condition, what circuit
> would provides the best protection to the gyrator; A Fuse?
> Hutch
>
> On 9/5/2012 8:05 AM, J. Forster wrote:
>> I'm almost certain these things are useless to make switching DC/DC
>> converters, as they have no energy dtorage mechanism.
>>
>> -John
>>
>> =================
>>
>>
>>> Dave,
>>>
>>> An interesting concept.  Thanks for bringing it up.  It's a gyrator, a
>>> capacitor and amplifier that impersonate an inductor.  See article in
>>> wikipedia.
>>>
>>> There's also this in German:
>>> http://www.loetstelle.net/projekte/gyrator/gyrator.php
>>>
>>> I have no firsthand experience with this, but I'm adding it to my bag
>>> of
>>> tricks.
>>>
>>> Al
>>>
>>> On 9/5/2012 7:14 AM, David Stinson wrote:
>>>> One of our good members recently brought another
>>>> interesting "Borg Implant" board to my attention.
>>>>
>>>> It's named a "solid state choke"- a tiny board
>>>> with a MOSFET active device that claims the
>>>> efficacy of a 50 Henry choke at up to 200 mA output,
>>>> with over an amp surge.
>>>> I've seen some devices claimed as "solid state chokes"
>>>> that were actually high-voltage linear regulators,
>>>> but this device is different.
>>>> Wondering if anyone here has any experiance with
>>>> this sort of circuit or any thoughts about it.
>>>> Here's a link.   Scroll down for a circuit diagram:
>>>>
>>>> http://www.ebay.de/itm/110794732851
>>>>
>>>> 73 Dave AB5S
>>>>
>>>>
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>>> --
>>> Al Klase - N3FRQ
>>> Jersey City, NJ
>>> http://www.skywaves.ar88.net/
>>>
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>>
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>
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