Hi Mike,
It could be done in the "old way" with a phase control using a Triac.
See Unitrode Application Note U-83
http://www.ti.com/lit/ml/slup061/slup061.pdf
or perhaps an old GE SCR handbook.
A modern scheme might employ a small PIC microcontroller.
73 & Good morning,
Marv WC6W 310 649 3111
http://qsl.net/wc6w/
--- On Wed, 12/14/11, Mike Baker <k7dd@cox.net> wrote:
> From: Mike Baker <k7dd@cox.net>
> Subject: Re: [Amps] Warm up and on time question...
> To: amps@contesting.com
> Date: Wednesday, December 14, 2011, 7:38 PM
> Speaking of warm up times and
> filament life got me to thinking about a
> ramping switch system for the whole power supply.
> As I understand it there are devices which will chop up the
> AC sine wave
> into pieces like a PWM and slowly add more and more pieces
> until the full
> sine wave is present on the load. I also understand they
> can be used in
> reverse. Sort of like having an electronic Variac on the
> input side of the
> supply.
> Do any of you have a circuit diagram for such a system or
> could point me in
> the right direction? I am not even sure what to call
> what I am looking for.
> It sounds like a ramping soft start system and that would
> solve a lot of
> problems with initial turn on of the filaments and the
> Plate supply.
>
> Thanks in advance.
>
> Mike Baker K7DD
> K7dd@cox.net
> All QSO's are uploaded to LOTW and EQSL.
>
>
>
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