Re: [TCML] Terry filters

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi Bill,

I'm a bit more awake and you're math looks correct to me ;^))
So the power wasted by the Terry filter resistors appears to ne-
gligable, especially in comparison to the SG losses (~25%).

David Rieben


----- Original Message ----- 
From: "Bill Lemieux" <gomezaddams@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, December 30, 2007 12:32 PM
Subject: Re: [TCML] Terry filters



On Dec 30, 2007, at 12:15 AM, Neal Namowicz wrote:

> Hello everyone,
> Just a question about terry filters, since the topic seems to be  cropping 
> up a lot lately. How much loss is there when using them?  I'm no EE, but 
> any time I see the main power coming in going through  resistors, there 
> must be some loss.

power dissipated in a resistor = the square of the current X resistance

So, for a TF with 1kΩ resistors, and a 15kV / 30 ma NST short-
circuited by the spark gap, we dissipate 0.9 watts in the resistors,
or 0.2% of the transformer's power.

With a 15kV / 120mA NST driving a short through the filter, we
dissipate 14 watts, or 0.8% of the transformer's maximum power.

(somebody check my math, I'm still waking up this morning)

> Also, are the TF's "one size fits all", or can the components be  sized to 
> correspond with how much potential power you have coming  in? It seems 
> that we endeavor to eliminate "lossy" components.  "Using beer bottle 
> caps? Replace them with an MMC." Don't use a  dimmer switch, too "lossy", 
> etc. Ultimately, is using a TF a trade- off between loss and protection? 
> Kind of like driving a newer car  that comes with a mandatory explosive 
> device (air bag) in the  steering wheel. "But it's for your protection!" 
> Just one of a number  of reasons my two vehicles are 1964 and 1980 Chevys. 
> The k.i.s.s.  principle, and no bombs staring me in the face. But I 
> digress,  sorry. So, what do you think about the terry filters?
>
> Neal.
>
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