Re: MOSFET TC design

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

D.C.,

Just curious - why did Chris Hooper use MOSFETs instead of IGBTs?
--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, October 18, 2006 6:36 PM
Subject: MOSFET TC design


> Original poster: "D.C. Cox" <resonance@xxxxxxxxxxxx>
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> I'm designing a small, compact, and highly portable MOSFET powered
> Tesla coil.
>
> I plan on running a batch of printed circuit boards with plans, and
> offering them to the list members.
>
> The heart of the circuit is a pair of $22 MOSFETs that switch MMC
> power into a coil featuring a 6 inch ID PVC tube secondary.  The sec
> coil features a 16 inch long winding of #30 AWG  150 degree C.
> double-insulated magnet wire.  I hope to have the complete unit
> design available at a cost of under $95.
>
> Chris Hooper, an EE from Arizona, produced the original circuit.  I
> plan on using the same logic but adding the voltage doubler to boost
> the output from his circuit's 9 inches to a min. of at least 16
> inches, perhaps as long as 18 inches spark output.
>
> The powers supply will be a 120 volt rectified, line doubled power
> supply to produce a 336 VDC drive into the pri coil.  The pri cap
> with be a handful of MMC caps based on the 0.15 uF, 2 kV C-D caps.
>
> I expect spark output using a 1 x 7 inch toroid to be approx 16 - 18
> inches long.  Not bad for a complete system weighing less than 6
> lbs.!  I'm having O.W. run a batch of toroids for me.  The more
> orders the cheaper the toroids will be for everyone.
>
> Anyone that might be interested in a board please advise as I plan on
> placing the board order early in November.  Contact me off-list and
> advise.  I will add you to our board bulk purchase list.
>
> Also, contact me off-list and I will email you the pri-sec coil
> geometry plans so you can start working on gathering your parts.  PVC
> tube, wire, phenolic plates, etc.
>
> Happy long sparks!
>
> Dr. Resonance
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