Choke input 3 phase rectification voltage? - diyAudio
 Choke input 3 phase rectification voltage?
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 12th January 2006, 10:28 PM #1 diyAudio Member   Join Date: Dec 2004 Location: Cincinnati, Ohio Choke input 3 phase rectification voltage? If I were to use a 6 pulse bridge rectifier with a choke input LC filter, relative to the AC RMS voltage across each secondary, what DC voltage out would I get: With delta connected secondaries? With wye connected secondaries? __________________ Be sure your foil hat has a good low impedance ground.
 12th January 2006, 10:36 PM #2 diyAudio Member     Join Date: Nov 2005 Tweeker, The ralationship between delta and wye is the square root of 3 (1.73). So if you measure 120 volts from leg to neutral (wye); you will measure 208 volts from leg to leg (delta... or wye for that matter).
 13th January 2006, 01:19 AM #3 diyAudio Member   Join Date: Dec 2004 Location: Cincinnati, Ohio I know 3 phase wye bridge rectified without a choke but capacitor gives 2.45*VAC RMS= VDC, what does it give with a choke? 1.73*.9= 1.56? With delta connected secondaries, does this mean output with choke would be VAC RMS * .9 = VDC? What scant information I can find seems to indicate this isnt quite right, choke input polyphase rectifiers seem to be obsolete. __________________ Be sure your foil hat has a good low impedance ground.
 13th January 2006, 02:13 AM #4 diyAudio Member     Join Date: Nov 2005 I will have to look... in a little red book I have... Wait for tomorrow... I can't promise an answer... I just don't want to give you a BS one.
 13th January 2006, 05:21 AM #5 diyAudio Member   Join Date: Dec 2004 Location: Cincinnati, Ohio In fact Im pretty sure it isnt * .9, average voltage would be much higher than with single phase. __________________ Be sure your foil hat has a good low impedance ground.
diyAudio Member

Join Date: Nov 2005
hey Tweeker,

The average voltage factor is 0.954969. I couldn't find my little red book so I Armstrong-ed it in Excel... PM me if you want the spreadsheet.

Remeber, when you sum the 3 rectified phases the voltages don't add... they merely overlap... only the biggest voltage wins...

OH... this isn't RMS... multply by 1.414

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