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LF: Re: Re: RE: LX1PD

To: [email protected]
Subject: LF: Re: Re: RE: LX1PD
From: "Andrew Talbot" <[email protected]>
Date: Mon, 25 Jun 2001 18:24:20 +0100
Reply-to: [email protected]
Sender: <[email protected]>
Why ?
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

-----Original Message-----
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%!

73 de
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 !

Andy  G4JNT

> voltage comes from six-phase rectification of the
> 220/380V mains
> without a transformer.

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