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From: Michael A. Terrell on 6 Apr 2010 06:03

Tim Williams wrote:
>
> "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message
> news:4BBA35A1.7565787D(a)earthlink.net...
> >> Inductors don't resonate.
> >
> > Really? Then why worry about SRF?
>
> Pure inductances are inductive from DC to light.
>
> Who knows what the OP actually has.


There are no pure inductances. There is always stray capacitance.


--
Lead free solder is Belgium's version of 'Hold my beer and watch this!'
From: Joerg on 6 Apr 2010 16:42
MooseFET wrote:
> On Apr 5, 1:27 am, Nicko <n...(a)desmith.net> wrote:
>> Hi,
>>
>> I've got a current transformer looking at AC pulses to an inductor -
>> these can get quite big due a feedback mechanism that tunes the
>> circuit for resonance & maximum current. In order not to detonate the
>> driving bridge, I want to inhibit the bridge very quickly (in the next
>> cycle) should the peak (not RMS) current start getting too high - we
>> are talking a range of 20-200A depending on the drivers. Frequency is
>> up to 150kHz.
>
> The output of the transformer can go directly to a couple of
> comparators.
> You can shut down if either one says there is too much current.
> This will be fewer parts than making the rectifier because the
> comparators come two to a package and a "wire-or" does the OR
> function.
>

If it has to be super small there's even dual comparators with built-in
reference in super-tiny SOT or DFN packages. For example the LT6700
series which happens to also come in a +/- configuration for window
comparators (which is what Nicko needs). Such convenience has its price,
of course.

http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1154,C1002,C1463,P2340,D1035

When using this one watch out during power-up, the ref is out of whack
for about the first 500usec.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
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