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
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
hacknet said:
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?
--
Brian
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?
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?
hacknet said:
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.
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...
/UrSv
/UrSv
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...
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...
UrSv wrote:
The thingie he is talking about is called IDEAL transformer for which the equation
Vout = Vin * winding_ratio
applies.
Unfortunately we all live in the real world .........
But if Hacknet would let us know what he exactly wants to do we might find a (more or less) elegant workaround.
Regards
Charles
The thingie he is talking about is called IDEAL transformer for which the equation
Vout = Vin * winding_ratio
applies.
Unfortunately we all live in the real world .........
But if Hacknet would let us know what he exactly wants to do we might find a (more or less) elegant workaround.
Regards
Charles
phase_accurate said:UrSv wrote:
The thingie he is talking about is called IDEAL transformer for which the equation
Vout = Vin * winding_ratio
applies.
Unfortunately we all live in the real world .........
Exactly. I did say that it was hard to find one...
Variac said:
You could say that a tranformer works thanks to the change in the magnetic field that is made by the primary windings. This makes a 'induction current' (probably a bad translation...) in the secondary coil.
When you take this a little bit further, breaking the connection in that Model T ignition, causes the magnetic field to disappear totally and re-appear again. That definitely is a change in magnetic field and that induces the current in the secondary winding.
Marc
trafo's on DC
When I was (much) younger I had also a whacky idea: built transformers with a wooden core to get rid of the iron losses. Guess what? It worked! No more iron losses. Not much of anything else either, though.
Ahh, those days in blissfull ignorance. (Still ignorance, but no longer blissfull).
Jan Didden
When I was (much) younger I had also a whacky idea: built transformers with a wooden core to get rid of the iron losses. Guess what? It worked! No more iron losses. Not much of anything else either, though.
Ahh, those days in blissfull ignorance. (Still ignorance, but no longer blissfull).
Jan Didden
I did it!
I got DC through a transformer!!!
When I put DC current into one of the primary leads, it came out the other primary lead!
All kidding aside, I'm pretty sure that's about the only way to do it with real world components...
John
I got DC through a transformer!!!
When I put DC current into one of the primary leads, it came out the other primary lead!
All kidding aside, I'm pretty sure that's about the only way to do it with real world components...
John
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