[Amps] Acceptable ripple on high voltage plate power supply...

[jim.thom jim.thom@telus.net]

 Raw DC  from a 3 phase rectifier ( 6 x legs used)  is just 5.2%
ripple....when using 60 hz.
Raw DC  from a  (60hz) single phase rectifier  (FWB/ FWCT / FWD)  is  67%

That's a huge advantage in favour of 3 phase power.   92% of the  filtering
has already been done for you.  Very little filtering required to get from
5.2%.....down to  say  1 - 3%.

Ripple freq is  2F   with  single phase   (100/120 hz)
Ripple freq is  6F   with  3 phase          (300 / 360 hz)

Jim  VE7RF

On Thu, Dec 26, 2024 at 3:59 PM Ron W4BIN <ka4inm at gmail.com> wrote:

> On 12/26/24 2:52 PM, jim.thom jim.thom at telus.net wrote:
> > Date: Mon, 23 Dec 2024 09:39:03 -0500
> > From: "Bob D." <ajamas.rn at gmail.com>
> > To: amps at contesting.com
> > Subject: Re: [Amps] Acceptable ripple on high voltage plate power
> >          supply...
> >
> > <Check my math....
> >
> > <For 10% P-P 120 Hz(full wave 60Hz rectified) voltage ripple at max
> current.
> >
> > <Ballpark math.
> >
> > <That's 7% RMS.
>
>    Polish amplifier = 50. Hz
>
>    three phase power supply from a generator (as I recall) and full wave
> (as I recall)
>
>   --
>    Ron W4BIN
>