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@gmail.com> wrote:
> On 12/26/24 2:52 PM, jim.thom jim.thom@telus.net wrote:
> > Date: Mon, 23 Dec 2024 09:39:03 -0500
> > From: "Bob D." <ajamas.rn@gmail.com>
> > To: amps@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
>
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