Maker Pro
Maker Pro

Micrometals

T

Tom Bruhns

Jan 1, 1970
0
Their sitehttp://www.micrometals.com/
doesn't seem to be responding.

Does anyone else have this problem ?

Graham

I notice that your posting was, apparently, at about 3AM Pacific time
(Micrometals time zone). It may well have been that their site was
down for maintenance at that time. Works fine for me now.

Cheers,
Tom
 
J

John Larkin

Jan 1, 1970
0
Their site
http://www.micrometals.com/
doesn't seem to be responding.

Does anyone else have this problem ?

Graham

Looks OK now. Their powdered iron stuff sucks for power apps (tends to
burn the paint off the cores) but I think they now have a KoolMu
equivalent that's pretty good.

John
 
R

Rich Grise

Jan 1, 1970
0
Opened straight away for me.

Me, too.

It must have been a temporary glitch, or a scriptkiddie/browser
incompatibility.

Cheers!
Rich
 
A

Anthony Fremont

Jan 1, 1970
0
John Larkin wrote:

Looks OK now. Their powdered iron stuff sucks for power apps (tends to
burn the paint off the cores) but I think they now have a KoolMu
equivalent that's pretty good.

"burn the paint off"? Man, what are doing with them? ;-) Doesn't that
cause permanant damage to the core? I was under the impression that heating
a core too much could/would lead to permanant changes in the Al value.
Maybe this only applies to ferrite?
 
G

Genome

Jan 1, 1970
0
John Larkin said:
Looks OK now. Their powdered iron stuff sucks for power apps (tends to
burn the paint off the cores) but I think they now have a KoolMu
equivalent that's pretty good.

John

If you ignore the specific power loss graphs then all powdered iron sucks
for power apps.

DNA
 
E

Eeyore

Jan 1, 1970
0
Genome said:
You don't use output inductors in your buck derived converters. Micrometals
is just saving bandwidth.

It's not buck derived.

Graham
 
G

Genome

Jan 1, 1970
0
Eeyore said:
It's not buck derived.

Graham

So.....

Since you didn't use an output inductor in your buck derived converter it
blew up so you decided to use a different topology and this one is having
similar blowing up problems so you are going to use an output inductor with
it.....

Excellent!

DNA
 
J

John Larkin

Jan 1, 1970
0
John Larkin wrote:



"burn the paint off"? Man, what are doing with them? ;-)


It was a kilowatt polyphase buck switcher, essentially three buck
switchers in parallel with timings offset 120 degrees. The powdered
iron toroids fried, even with lots of air flow. I went to permalloy
powder, expensive but efficient. The CoolMu types are almost as good
as permalloy for things like this, but a lot cheaper.

I "invented" the 3-phase switcher in 1985, but I'm fairly sure
somebody beat me to it.

John
 
E

Eeyore

Jan 1, 1970
0
Genome said:
So.....

Since you didn't use an output inductor in your buck derived converter it
blew up so you decided to use a different topology and this one is having
similar blowing up problems

Any expiry of mosfets had zilch to do with the output circuit. If you recall
there was an 'undocumented feature' of the controller chip.

so you are going to use an output inductor with
it.....

Excellent!

Tell me something.....

Do inverters use output inductors

Graham
 
E

Eeyore

Jan 1, 1970
0
John said:
It was a kilowatt polyphase buck switcher, essentially three buck
switchers in parallel with timings offset 120 degrees. The powdered
iron toroids fried, even with lots of air flow. I went to permalloy
powder, expensive but efficient. The CoolMu types are almost as good
as permalloy for things like this, but a lot cheaper.

My first experience of using Micrometals powdered iron toroids was in that power
supply I was working on a couple of years back. They aren't the easiest thing to
get hold of so I got some from RS components just to try.

They smoked very nicely. They were only -26 material though. When I got some in
-2 it was a very different story.

Graham
 
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