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Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
Yesterday when I was winding a GDT for a SSTC, I came upon a question.
Assume that a transformer has two primaries in parallel, and one secondary winding.
How much would the transformer step up an AC voltage if one of the primary windings has 10 turns, the other primary winding in parallel has 20 turns, and the secondary has 40 turns.
Registered Member #1517
Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
If I may make a guess... I think what lithium lord is saying is that the first primary would treat the second primary as its secondary, and the secondary would not be seen at all...
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
I think problems arise because there are different voltages that appear on the different windings at the same time. So let's say 1V is put on the pri with less turns. Two volts will appear on the winding causing current to flow from the two volt end to the other lower potential winding. This will cause a lot of current draw because it looks like a short to the transformer therefor drawing lots of current from the pri. I think this is what's going on and I hope it made sense.
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
So let's say 1V is put on the pri with less turns. Two volts will appear on the winding causing current to flow from the two volt end to the other lower potential winding.
As of now, I can see the situation in two different ways and I don't know which is correct. Lets assume our transformer is connected to a 9V AC source.
1. The first situation is that the first primary (with 10 turns) will have the AC voltage (9VAC) from the supply source placed across it, and then the second primary will receive twice that voltage. Since there is a higher voltage within the primary with 20 turns (18 volts) , current will flow to the lower potential end, (the other primary) and this effect will cause a "short effect" to happen.
2. The second situation involves looking at the primary with 20 turns first. If we assume that it recieves 9VAC from the supply source, then the other primary with 10 turns turns will have 4.5 volts AC across it.
Which one of these primaries (the 10 turn or the 20 turn one) will end up with a higher voltage.
But then again, they are BOTH connected into a 9VAC source so the fact that they end up with different voltage is confusing me even more.
And how much would this transformer as a whole, step up an AC voltage?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Both windings are trying to force a different amount of magnetic flux through the core, so theoretically they will try to draw infinite current, but in reality, the coupling between the windings will limit the current to some (very high) value.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
I think this is the problem
Assume that a transformer has two primaries in parallel
All a transformer has is windings, it is only the person who writes the documentation that chooses arbitrarily whether a winding is a pimary, a secondary, or an anything-else-ary.
Generally, when a transformer is to be driven from a low-impedance supply, we designate one winding to be indepedantly driven and call it the primary, then the voltage on all the other windings is depedant on the turns ratio, and we call those secondaries.
Any windings that share the same terminal voltage may be paralleled safely. Any windings with different voltages will create a shorted turn if paralleled.
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Transformer question
