Re: Is high coil frequency a bad thing?

• To: tesla-at-pupman-dot-com
• Subject: Re: Is high coil frequency a bad thing?
• From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Mon, 05 Oct 1998 17:33:52 -0600
• Approved: terryf-at-verinet-dot-com

Hi Doug,
    
> Original Poster: Doug Brunner <dabrunner-at-earthlink-dot-net> 
> 
> I'm redoing the math for my coil, and it looks like one of the best
> options (in terms of wire availability and spark breakout) would involve
> running at a fairly high frequency (440 kHz or so). Would that tend to
> diminish performance relative to operating around 100 kHz?

Go as low as you can afford is a good idea. A lot has to do with 
getting a high surge impedance in the primary. This can affect 
performance significantly - i.e. suppose you have some capacitor you 
wish to use, then increasing primary inductance while also increasing 
primary copper cross sectional area is going to be better. Key 
equation:  Xp = SQRT(Lp/Cp)/Rp  where Rp is effective series 
resistance of the primary circuit. 

Malcolm

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