by chemelec » Thu Mar 29, 2007 6:08 pm
Yes Michael, Its Capacitive and Inductive Reactance.
I think also IMPEDANCE or the AC resistance that is produced at one frequency will vary with the amount of power running thru this coil? Am I right so far?
** No, The Power transfer Will Vary as the Frequency Changes.
Example: if the Inductive reactance was 100 ohms, As the Frequency Up, The Power Will Increase. And Visa Versa
The Higher the Frequency, Also the Smaller the transformer for a given power. This is Why a lot of switching supplys now operate at 100Khz to 1 Mhz.
Short on TIME TODAY And Tired. (Was Up at 4AM and only 3 hours sleep)
Quick Answers as BEST I CAN. Brain Not Awake Much.
#1 Where do I start on turns for primary or secondary.
** You Start by Knowing the Frequency and Power you want to Transfer.
** Than Determine an Inductive reactance that will allow that current to Flow at the Supply Voltage you have.
(NOTE Also: Since a PERFECT COIL Doesn't Exist, the Coil Has CAPACITANCE and Capacitive Reactance.)
** Basically Than Choose a Suitable Core and Wire Gauge and start on the Primary.
**** BUT HERE is Where the AL Value comes in. OR Trial and Error with an Inductance meter.
** There is Also the Type of Core to Decide. Torroid, E Core, Pot Core, and Many Other types. Some May Require Gapping, But Thats Another Subject.
THIS ALL GETS VERY COMPLICATED.
#2 How much resistance will the driver circuit take from my coils before burning up?
** Sorry Doesn't make sense.
#3 Because 3 frec's are being used all at one time, what would be a good core mix for such a broad range of operation.
** The Concern is More the Power. Typically a Fair-Rite Core, Material 77 Will Handle the Frequencys that Bob is using.
** Sorry CAN'T List All the manufacturers and there Equivalants. There are Hundreds of different Manufacturers.
** In My OPINION a Seperate transformer for EACH Frequency, Than Series the Outputs.
#4 Do design practices for driver circuits have a common value of resistance at the output stage and how could it's max SAFE value be determined??
** COMPLEX QUESTION, Depends on How you designed the Driver.
Most of whats on this Site is Just a MOSFET, acting as an "On/OFF Switch".
A SUITABLE FUSE will usually Protect it.
#5 Finally what kind of wire is best for these inductor/toroidal's or do many types of wire still work pretty good?
** For What your Doing Here, Just Ordinary Magnet Wire is fine.
(Enamel Transformer wire)
** THESE are Not Super High Frequencys, Nor are they Really Fast Rise Time Pulses.
Hope this Helps a Bit.......Gary
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