[Amps] Direct rectification of AC mains to drive the amp,

[peter chadwick]

Jim,

What about power factor correction circuitry?

73

Peter G3RZP


========================================
 Message Received: Sep 22 2013, 06:27 PM
 From: "Jim Thomson" <jim.thom at telus.net>
 To: amps at contesting.com
 Cc: 
 Subject: [Amps]  Direct rectification of AC mains to drive the amp,
 
 Date: Sat, 21 Sep 2013 09:50:52 -0700
 From: Don Jones <ko7i at comcast.net>
 To: amps at contesting.com
 Subject: Re: [Amps] Direct rectification of AC mains to drive the amp,
 VDD Supply
 
 This is tricky. If the outlet you are using as the source is not daisy 
 chained to a bunch of other outlets and goes directly to the panel, and 
 you use a true 3 wire connection L1, L2 (or N) and Gnd, you can "get 
 away" with it provided you use an appropriately selected EMC filter too. 
 It is safe and efficient? no, heed the advice that you have been given 
 by others.
 Vy 73, Don KO7i.
 
 ##  Why wouldn’t it be efficient ?    With direct rectification you just eliminated
 the xfmr !   Now you have NO limit to the amount of power you can generate.
 No V drop across any xfmr either, no sag...no xfmr.  Both static and dynamic regulation would be
 better, a lot better.   No magnetizing current on the primary of the xfmr as  there is no xfmr. 
 No heat generated from the xfmr...as there is NO xfmr.   You also just freed up a ton of
 space.  You also eliminated  a ton of weight. 
 
 ##  For high power use, Id say it’s the ideal ticket.   All you need is big ga  CU wire back to the
 main 200A panel.   I would not write off a transformerless   supply just yet.    I think we are just getting
 started.   240 x 1.414 =   340 vdc.......and  @  10-100A  CCS easily. 
 
 Jim  VE7RF
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