[Amps] Switching Supplies for High Current Filaments

[Paul Decker]

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> 
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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.