Inductor Voltage Rating?

r

Neat. Bzzzttt phffft!.

I'd have some concern about a.c. HV vs. d.c.--a.c. exercises the dielectric. I'd expect high e-fields to accelerate wear.

--
Cheers, 
James

Western Electric?

I have used the Bourns SDR0805 for a 15V buck converter with 400VDC input. Upon request, the manufactor has stated that the inductor is good for 600VDC

AFAIR, at these voltages you need to be carefull that you will not get corona discharge effects, but at least we didn't see any during the testing.

Cheers

Klaus

That is the correct way to do it with such high voltages. Ask the manufacturer for a statement, preferably in writing. Anything else would IMHO be irresponsible when doing a product design.

It can become a concern if used in other climate zones. Sometimes coating or potting can help.

--
Regards, Joerg 

http://www.analogconsultants.com/

As a teenager I found that out the hard way with an RF power amp design, tubes. BIG tubes. Used it at higher frequencies, worked, yeehaw! Then ... tzzt ... pop .. pop-pop ... PHSSSST ... *PHOOOF* ... plate current meter briefly pegged ... thwock .. all lights out. It had tripped the mains breaker.

After disecting it turned out that the plate choke had completely clumped and welded together, leaving spatters all around it. An amperage smell wafted through the house.

--
Regards, Joerg 

http://www.analogconsultants.com/

At higher voltages you'll find that core loss becomes a more serious factor in rise, as you're tempted to minimize turns and allow increased ripple current.

Inductors can be used in series, if off-the-shelf parts look a little fragile, construction-wise.

Deconstruct a few and eyeball internal layer and winding/core stress, if in doubt.

RL

Be aware when using heat dissipating devices in series that a lot of that heat is intended to leave via the end terminations. Which means the end attached to another will not be losing heat as fast as you thought. Two in series we used to dreate a bit something like to 70% of what you can do with one. And for three in series, well the center one is going to get the hottest. To mitigate a bit, we'd use oversized metal pours around the connections. Helped a bit.

Not so much as experience, but some relatively sound advice.

Wire insulation withstand comes in voltage ratings, like low voltage 50 V or less, 300 V or less, 600 V or less, 1000 V or less. Select for insulation voltage rating to suit your needs.

See NFPA 70 "National Electrical Code" and ANSI/IEEE C2 "National Electrical Safety Code".

It also comes in temperature grades which are related to the hottest part of the winding. That location varies a bit due to winding dimensions and core losses with attendant core temperature rise.

See:

?-)

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Na'sdarovje!

--
SCNR, Joerg 

http://www.analogconsultants.com/

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I thought it was a very poignant comment ;-) ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

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    ...Jim Thompson       |    mens     |     |     et      |  |       |

translation: Contact the manufacturer's name to get the key, or if the number is small, it does not cost that much more to get custom coils with your requirements.

but you knew that, right?

What's handy with google access is that when a posting comes up in foreign language, I simply click above the message 'translate to english' and voila!

looks like this originally: snipped-for-privacy@gmail.com View profile Translate to English More options May 12, 12:46 pm

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