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Old 17th December 2002, 02:49 AM   #1
hacknet is offline hacknet  Singapore
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Default how do you get trafos to work on DC?

im got a whacky idea to get power trafos to work on DC? iz this possible?
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Old 17th December 2002, 02:51 AM   #2
halojoy is offline halojoy  Sweden
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Default that is oner of the main purposes

of trafos
to get some nice DC
out of that unuseful AC
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Old 17th December 2002, 03:23 AM   #3
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Default Re: how do you get trafos to work on DC?

Quote:
Originally posted by hacknet
im got a whacky idea to get power trafos to work on DC? iz this possible?
If you get it to work, we will want
to see it.

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Old 17th December 2002, 03:26 AM   #4
halojoy is offline halojoy  Sweden
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Default Re: Re: how do you get trafos to work on DC?

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Originally posted by Nelson Pass
If you get it to work, we will want
to see it.
veru funni
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Old 17th December 2002, 04:05 AM   #5
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Not possible.

Transformers require magnetic flux in the core to change in order to create "moving" magnetic field that will induce a current in another winding. If you connect DC to one coil in a transformer, the moment you connect it you'll get a rapidly changing flux and so a spike out of another coil wound on the same core, but once that transient dies out (very quickly) you'll get nothing out of the second coil. In the mean time, unless you limit the current on the coil that has DC connected, you'll be heating up the whole transformer, probably to the point of melting the wires. When the wire finally melts through and breaks open the coil, you'll get another massive spike in the magnetic field followed by another spike in the second coil (assuming it hasn't melted yet).

Look here:
magnetic amplifiers and saturable reactors
Look at the stuff on magnetic amplifiers and saturable reactors.

MR
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Old 17th December 2002, 04:18 AM   #6
BrianGT is offline BrianGT  United States
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Default Re: how do you get trafos to work on DC?

Quote:
Originally posted by hacknet
im got a whacky idea to get power trafos to work n DC? iz this possible?
Even with putting a lot of rigorous effort into it, I don't think you will ever be able to get a transformer to work with DC.

However, if you search the net, you will find designs using ICs, or mosfets, capable of DC to DC conversion.

What is the application? Audio amplifier for the car?

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Brian
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Old 17th December 2002, 04:37 AM   #7
Variac is offline Variac  United States
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Hey old guys:

How about those Model T ignition coils that had a make and break vibrator. Did they just collapse the field or did they actually switch the polarity back and forth?
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Old 17th December 2002, 06:17 AM   #8
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Default Re: how do you get trafos to work on DC?

Quote:
Originally posted by hacknet
im got a whacky idea to get power trafos to work on DC? iz this possible?
The idea isn't totally crazy. You can transport DC signals through a transformer if it is equipted with a Hall element but this requires active power for the Hall element.

You can transport only AC energy through a normal transformer and that's that! But I must add, as we know of right now. Maybe tomorrow we can.... I'll remember the blue LED (and even white) which were totally impossible to make when I studied semiconductor sience.
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Old 17th December 2002, 07:52 AM   #9
UrSv is offline UrSv  Sweden
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Oh, I seem to recall from school that running a transformer with DC was easy. You just have to find an ideal transformer. That's the problem...

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Old 17th December 2002, 08:54 AM   #10
Thomas is offline Thomas  Denmark
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Maby if you told us what it was for, we would be able to help you some more.

One wild guess:

Anyways, first you need to transform the DC (a car battery maby?)into AC, you can make a nice 50-60Hz AC with a NE555 or similar and power it up with some suitable power transistors. When you got enough power out of your circuit, connect the trafo and be happy. But now you got AC. So, what's the deal? What do you want? No, realy...
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