Author Topic: Purpose for variable choke in VIC  (Read 13913 times)

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Re: Purpose for variable choke in VIC
« Reply #16 on: June 26, 2012, 20:35:34 pm »
its all about the resonant frequency of the choke !!!!!! thats what restricts amps on each side

Ok, so what are the parameters to build a choke with a SRF (self resonating frequency) of 5kHz, for example.

TS

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Re: Purpose for variable choke in VIC
« Reply #17 on: June 26, 2012, 23:08:49 pm »
its all about the resonant frequency of the choke !!!!!! thats what restricts amps on each side

Ok, so what are the parameters to build a choke with a SRF (self resonating frequency) of 5kHz, for example.

TS

For that you need a high permeability core and dielectric constant on the insulator...

Probably a thicker wire without insulation very close one turn from the other but without touching wound around a closed toroid high permeability and under a very pure water... or filled with barium titanate ...


 You want high inductance and capacitance per turn...

Another way to do that is thru the use of foil copper to roll the coil but you still need to add a core to it to lower the frequency down to 5 khz ... i would guess. The greater the number of turns the greater is the number of series of parallel resonant circuits... its intended to be a rolled foil capacitor like but having only one electrode... as the diameter increases there is going to be differences in the resonant frequencies in series so a the band width increases... to compensate for that the foil can be cut to compensate the capacitance and keep all turns resonant at the same frequency... an increase in insulation can also help compensate.
« Last Edit: June 27, 2012, 06:29:45 am by sebosfato »