[Amps] Switching Supplies for High Current Filaments

[Radio WC6W]

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 at comcast.net> wrote:

> From: Paul Decker <kg7hf at comcast.net>
> Subject: [Amps] Switching Supplies for High Current Filaments
> To: amps at 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 at 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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