Hi Mike,
Have a look at: http://www.pc5m.net/projects/filament-inrush-protection
Is in use for my TH289 (45amps of filament current) amplifier.
Gl, Carel
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Mike Baker
Sent: donderdag 15 december 2011 4:39
To: amps@contesting.com
Subject: Re: [Amps] Warm up and on time question...
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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