From: mynamespacedbydots@xs4all.nl   
      
   "Paul D. Spiegel"  wrote in message   
   news:k3gucb$cii$1@ktb2.ktb.net...   
   > For my next project I have acquired a transformer with two identical 450v   
   > secondary windings.  I could put the windings in parallel and use a bridge   
   > rectifier.  Or, I could put the windings in series and ground the coupling   
   > for a 450-0-450 configuration to use with a pair of diodes.   
   >   
   > Which would you do?  What are the pro's and con's of the two   
   > configuration?   
      
   Pro bridge/windings parallel:   
   - Better B+ regulation because HV-winding resistance is halved.   
   - Less heat development in HV-winding.   
   - Diode reverse voltage stress about 635V versus 1270V for the center tap   
   config.   
      
   But... are you sure both HV-winding voltages are exactly identical?   
   Otherwise one winding is supplying current to the other one by   
   voltage-difference/2*winding-resistance.   
      
   Con bridge/windings parallel:   
   - 4 diodes needed in stead of 2 for a center tap config.   
      
   Rgds,   
   Gio   
      
      
   >   
   > For this project I am using SS rectifiers.  Were I using a tube rectifier   
   > I would go with the center tap, of course.   
   >   
   > - Paul   
      
   --- SoupGate-Win32 v1.05   
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