I did look at this, and came to the conculsion :
Peak of one cycle falling to the 60 degree point, SIN(60) = 0.866. So
ripple = 1 - 0.866 = .134 hence 13.4%
I did hear once that some high power transmitters do not use decoupling caps
in their PSUs, and if the 3-phase ripple is only 4% that may explain how
they can get away with it.
Andy - off to have a look at a textbook on heavy electrical power
From: John Rabson <[email protected]>
To: [email protected] <[email protected]>
Date: 25 June 2001 16:22
Subject: LF: Re: RE: LX1PD
I think its 4%!
John Rabson G3PAI
----- Original Message -----
From: "Talbot Andrew" <[email protected]>
To: <[email protected]>
Sent: Monday, June 25, 2001 2:03 PM
Subject: LF: RE: LX1PD
That's set me thinking evil thoughts .......
600V Mosfets in bridge. 3 phase rectifier giving 13% ripple even without
any decoupling caps, at a ripple freq of 300Hz. 10kW perhaps !
> voltage comes from six-phase rectification of the
> 220/380V mains
> without a transformer.
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