Re: [TCML] Burn Through The Stem Of The Globe?

["Scott Bogard" <sdbogard@xxxxxxxxx>]

Miles,
     I'm assuming Ohms law to be correct (V=IR, higher V constant R,
higher I), and I'm assuming impedance to be constant, and I'm
justifying these assumptions based on being told the fuse for the
driver was a 10 Amp fuse (not one or two amps.)  However like I said,
this is hearsay, based on pictures and description over the phone, I
have not personally seen the fuse, and the person on the other end of
the line may have misread the number.  There may be more to it than
that!  I love the elegance and simplicity of the ZVS driver, and one
cannot compete with the power outputs, however I want to design a
circuit of my own from the ground up, and I want infinite run times,
so I'm afraid the ZVS driver is not for me right now.

Scott Bogard.

On 1/18/09, miles waldron <mileswaldron@xxxxxxxxxxx> wrote:
>
> Scott,
>
> Wait! Math wierdness. 2 amps at 12V, would be 0.2 amps at 120V. You are more
> likely in the 20 watt range. The IRFP450 ZVS is an absolute champ driver
> circuit, and I can get to almost 120 watts with it. Nothing else that I
> tried comes even close to driving a flyback as well.
>
> Another thing to remember Miles, is that the globes Mark used were old, and
> they just don't make stuff like they used too; it is highly probable that
> the glass is substantially thicker on Marks globes.  I have heard of many
> MOSFET driven globes dying, especially when driven by the power supplies for
> sale at Amazing1, but then again from what I know of those drivers they run
> off of Rectified 120V, but I don't know that for sure from looking at
> pictures (I suspect this because I saw no step down transformer in the
> works, and the thing had an AC wall
> plug.)  If my globe draws 2 amps at 12 V, that could mean 20 A at 120V, or
> 2400W at full power (which is an absurd value, so I'm sure there are means
> to prevent this.)  Just my two cents, I'm no expert.
>
> Scott Bogard.
>
>
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