Hi Paul,
Here's the simple solution
http://qsl.net/wc6w/wc6wamps/index.html?fr63.html
Note: If you are using Explorer 8 or 9, "Compatabilty Mode" must be selected
on the "Tools" menu to properly view my webpage.
73 & Good morning,
Marv WC6W
http://qsl.net/wc6w/
--- On Thu, 10/7/10, Paul Decker <kg7hf@comcast.net> wrote:
> From: Paul Decker <kg7hf@comcast.net>
> Subject: [Amps] Switching Supplies for High Current Filaments
> To: amps@contesting.com
> Date: Thursday, October 7, 2010, 4:48 AM
>
>
>
>
> I think making the switcher "ramp up" is pretty easy as
> most of them already ramp up their voltage at start up by
> varying the pwm duty cycle. I've done quite a bit of
> experimentation on this for a smps I am making. I don't
> think it would be a great leap to have the voltage quickly
> come up to 10% less or whatever is desired, then increase
> over some time as the current draw decreases.
>
>
>
>
>
>
>
> Paul, kg7hf
>
>
> From: TexasRF @ aol .com
> Subject: Re: [Amps] Switching Supplies for High Current
> Filaments
> To: jim . thom @ telus .net, amps@contesting.com
>
> Message-ID: <1d65b.1491fc92.39de8d3b@ aol .com>
> Content-Type: text/plain; charset ="US-ASCII"
>
>
> The solution to the over current problem is reducing the
> startup voltage
> enough that the 10% filament resistance still draws rated
> current. That takes
> 10% voltage according to ohm's law.
>
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>
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