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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Andre wrote ...
Ash Small wrote ...
Maybe more resistance would help?
Maybe the voltage is 'sagging', due to the current being drawn?
(doubling the number of turns doubles the voltage, but halves the available current, while the voltage is trying to push twice the current through the resistors (I=V/R))
I dont undertstand what you mean, I will think the core is saturating, but why is stoping at 10KV while each coil can produce 20KV by itself?
If you try to draw too much current, the voltage will sag (drop).
By doubling the voltage, you are trying to push TWICE the current through the resistors, but the xformer will only be outputing HALF the current, so you possibly need to increase the resistance by a factor of FOUR.
(I hope this clarifies things a bit.)
EDIT: Have you added the capacitors that PM suggested?
Maybe the voltage is 'sagging', due to the current being drawn?
(doubling the number of turns doubles the voltage, but halves the available current, while the voltage is trying to push twice the current through the resistors (I=V/R))
I dont undertstand what you mean, I will think the core is saturating, but why is stoping at 10KV while each coil can produce 20KV by itself?
If you try to draw too much current, the voltage will sag (drop).
By doubling the voltage, you are trying to push TWICE the current through the resistors, but the xformer will only be outputing HALF the current, so you possibly need to increase the resistance by a factor of FOUR.
(I hope this clarifies things a bit.)
EDIT: Have you added the capacitors that PM suggested?
Hi guys please read the tread you keep asking the same questions I had already answer, Ash-small what would be the resistor value the output should have? and how you came to the conclusion? what would be the formula for it, I'm just trying to understand it, because this problem only happens with high voltage transformer not with a regular step down transformer. have you stack 2 secondary before?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Andre wrote ...
Ash-small what would be the resistor value the output should have? and how you came to the conclusion? what would be the formula for it, I'm just trying to understand it, because this problem only happens with high voltage transformer not with a regular step down transformer. have you stack 2 secondary before?
Well, in order to ascertain if my supposition is correct, and I'm not saying it is, try increasing each resistor by 4X.
I don't know if the voltage is sagging, but increasing the resistance by a factor of four will ascertain whether my supposition is correct or not.
I'll try to explain. The core limits the power of the transformer to x watts (other factors limit power too, but I won't go into that here). If you double the voltage of the secondary, you halve the current (V*I=Watts, if voltage is doubled, current is halved). but, twice the voltage into the resistance doubles the current (I=V/R), so the resistors are trying to draw twice the current as before, when only half the current as before is available, so the voltage 'sags' under the increased load.
I don't know if this is what is happening, as the values of resistor you are using are quite high to start with, but it could explain the results you are getting.
remember, there is a limit to the power that the cores can handle. That's why we HV'ers like really big cores.
(I'm still learning all this stuff too, that's why I'm interested in this thread, because I'm building a 50kV transformer myself, but I'm trying to learn as much theory as possible before I start winding.)
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stacking coils together
