I can't do the Math or anything. It's one of the last things on my LT Spice Schematic.
Edit: Oh, and if you could go through the steps, I'm not sure if the Data will provide it all or what, I'm confused about the hole process.
Data Sheet of the Ferrite Core.
**broken link removed**
Here is the Schematic I have pulled off some of the values off the data sheet and put them on the schematic. I could sure use someone who could get this thing put together, maybe after I have a year or so practicing my maths I might have a go at it. But not at the moment.
Not quite sure what you're after, but to sim a transformer just place two inductors L1, L2 on the sheet and a command 'K1 L1 L2 1'. The inductor ratio is the square of the turns ratio.
ii) Measure winding ESR with an ohmmeter. Use twice these values in simulation since the resistance at frequency is higher than the DC value. My experience with ferrite and switchers is that it is usually nearly a factor of two higher.
So, I'm just measuring resistance? At a Factor of 2 or higher correct?
) Short all but most inductive windings and measure the leakage inductance with the DC LCR meter. Adjust the coupling coefficient to match this, or for the case of two windings:
K = sqrt(1-Lleak/sqrt(L1*L2))
Lleak = sqrt(L1*L2)*(1-K*K)
Sorry, I don't understand that. What is 'u'? In Spice you specify the inductance of L1 and L2. If, for example, you specify L1=16mH and L2=1mH that corresponds to a L1:L2 turns ratio of 4:1
Post #4 is from the help file in Spice, I don't have an LCR meter however I do have the Core Data sheet and # of turns and voltages, still beyond that I'm confused how it all fits together.
Ron, I'm building this to find out if the circuit will function or not. I have already wound the Transformer.
Sorry, I don't understand that. What is 'u'? In Spice you specify the inductance of L1 and L2. If, for example, you specify L1=16mH and L2=1mH that corresponds to a L1:L2 turns ratio of 4:1
I don't have any idea of L1 or L2 mH, I know that the core is at 4620 nH? How can I without an LCR meter ( only using) the Data sheet and the known V, #windings, permeability N30 at 25%, and Magnetic Characteristics from the Data sheet complete input needed for the Transformer in LT Spice?
Sorry, I don't understand that. What is 'u'? In Spice you specify the inductance of L1 and L2. If, for example, you specify L1=16mH and L2=1mH that corresponds to a L1:L2 turns ratio of 4:1
Mike, sorry. That was way over my head, how do I deal with post #12 and talk like I'm 13 years old. When I edit the coil in LT Spice I need the values of
Inductance [H]
Series Resistance
Parellel Resistance
How do I aquire those. I'm flayling here and not landing on anything?
196 * 4620^-9 = ~900uHy for each of your 4 windings.
Add a spice directive (like alec_t said in post #2) of "K1 L1 L2 L3 L4 .995"
The number at the end is the coupling efficiency. 1 implies 100%. A more practical value would be .99 to .995
If you have more than one transformer in a circuit you would have more K directives.
K2 L5 L6 .995
K3 L7 L8 L9 .995
etc.
Series resistance is the DC resistance of the winding. It's not critical for your transformer, but put in 10 milliOhms as a rough estimate. Leave parallel resistance open.
Follow the link in post 13. It tells you how to calculate the approximate inductance of your winding. For starters in LTSpice assume the series resistance of a winding is the same as you would measure with an Ohmmeter, Ignore Parallel resistance for now.
196 * 4620^-9 = ~900uHy for each of your 4 windings.
Add a spice directive (like alec_t said in post #2) of "K1 L1 L2 L3 L4 .995"
The number at the end is the coupling efficiency. 1 implies 100%. A more practical value would be .99 to .995
If you have more than one transformer in a circuit you would have more K directives.
K2 L5 L6 .995
K3 L7 L8 L9 .995
etc.
Series resistance is the DC resistance of the winding. It's not critical for your transformer, but put in 10 milliOhms as a rough estimate. Leave parallel resistance open.