Hello there.
I'm a new to this forum as a member although i'm following topics periodically.
I have a question about transformers.
Well I feel weird asking this as i'm very experienced in electronic/electric circuits and i also know the transformer basics but i'm missing a lot of details as i haven't played much with these.
No one should be embarassed to ask.
To the question now...
Let's say we are about to wind up a transformer.
What should we becareful about the Impedance of the Primary Coil?
I will try to make this question as clear is possible for me:
Is the impedance of the primary the one which determines the maximum current that the secondary can get? (not counting flux current,copper losses,etc).
So for example if we want a 200v to 100v transformer that will output 10A at 100v should the primary coil have 40-Ohm impedance at e.g 50hz? 200v x 200v / 40Ohm = 1000w,as 5Ax 200 = 1000w?
(Again,counting with 100% efficiency for everything for ease)
I need to know this as any info about winding transformer primaries does not take into account the resistance but only the turns.
I've had some experiments in the past with "improvised transformers" based on existing cores for a 12-15V secondary...
But no matter WHAT magnet wire i was using (new,double checked for shortings) ,with hundreds of turns the primary coil always had 2-4-10-15Ohms,etc DC Resistance on the meter and as result when tested with thermal loads in series the load was operating just as if it had a 2,4,6R, resistor in series which means the primary would draw a nasty current if directly connected to the grid.
More turns and different ratio doesn't make sense as for an easy example 110:220v transformers that are on the market with 10A output use a bulky high ampacity wire on the primary yet are in reasonable size,if you try to get high resistance with like 2.5mm wires you will wind a few kilometers.
I'm definitely missing something here..
Keep wondering why my primary coil attempts are solely acting like resistors? Should i make out the ratio with higher resistance thinner wire and more turns? Like 40ohms for 5A/200v primary and e.g 10A/100v secondary when unplugged?
Thanks in advance,i will appreciate any reply as i'm looking forward to put Figure this out.
I'm a new to this forum as a member although i'm following topics periodically.
I have a question about transformers.
Well I feel weird asking this as i'm very experienced in electronic/electric circuits and i also know the transformer basics but i'm missing a lot of details as i haven't played much with these.
No one should be embarassed to ask.
To the question now...
Let's say we are about to wind up a transformer.
What should we becareful about the Impedance of the Primary Coil?
I will try to make this question as clear is possible for me:
Is the impedance of the primary the one which determines the maximum current that the secondary can get? (not counting flux current,copper losses,etc).
So for example if we want a 200v to 100v transformer that will output 10A at 100v should the primary coil have 40-Ohm impedance at e.g 50hz? 200v x 200v / 40Ohm = 1000w,as 5Ax 200 = 1000w?
(Again,counting with 100% efficiency for everything for ease)
I need to know this as any info about winding transformer primaries does not take into account the resistance but only the turns.
I've had some experiments in the past with "improvised transformers" based on existing cores for a 12-15V secondary...
But no matter WHAT magnet wire i was using (new,double checked for shortings) ,with hundreds of turns the primary coil always had 2-4-10-15Ohms,etc DC Resistance on the meter and as result when tested with thermal loads in series the load was operating just as if it had a 2,4,6R, resistor in series which means the primary would draw a nasty current if directly connected to the grid.
More turns and different ratio doesn't make sense as for an easy example 110:220v transformers that are on the market with 10A output use a bulky high ampacity wire on the primary yet are in reasonable size,if you try to get high resistance with like 2.5mm wires you will wind a few kilometers.
I'm definitely missing something here..
Keep wondering why my primary coil attempts are solely acting like resistors? Should i make out the ratio with higher resistance thinner wire and more turns? Like 40ohms for 5A/200v primary and e.g 10A/100v secondary when unplugged?
Thanks in advance,i will appreciate any reply as i'm looking forward to put Figure this out.