[Amps] Warm up and on time question...

[Radio WC6W]

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 at cox.net> wrote:

> From: Mike Baker <k7dd at cox.net>
> Subject: Re: [Amps] Warm up and on time question...
> To: amps at 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 at cox.net
> All QSO's are uploaded to LOTW and EQSL.
> 
> 
> 
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