Power supply connections

MEnsing · 5th August 2010, 02:08 PM

For my Aleph-JX I use per channel two transformers (Amplimo 2x18V) and four recifier bridges.

power.jpg

First I wanted to parrallel the secondaries as within this picture;

Amplimo_parrallel.JPG

But then I saw the following schematic of a pass labs power supply;

passlabs_supply.JPG

I haven't seen this way of connecting before and I don't understand it well. Do the phases of the secondaries need to be out of phase with each other or is this possible with just any kind of transformer?

Bill Fuss · 5th August 2010, 02:26 PM

That is slightly unusual but tying center taps to the neutral cuts the rail voltage in half and I imagine doubles the available current. I'll have to stare at it for a while.

Bill Fuss · 5th August 2010, 02:47 PM

Instantainious current would stay the same but the duty cycle is cut in half I believe.

BobEllis · 5th August 2010, 04:30 PM

Is it me or is there a diode drop away from a short when A swings negative relative to 0? Could it be a drawing error?

Bill Fuss · 5th August 2010, 04:55 PM

I think the center taps are being held at 0 by the interconnection of the trafos. Does that make sense. It's a little hard to get my head around.

BobEllis · 5th August 2010, 05:14 PM

I see a short from T2 secondary terminal 0 the CT connection between T2 and T3 to the Neutral line, to the negative terminal of BR3, through the lower left diode to T2 terminal A. That's the easiest to see, but the 50% duty cycle short exists for all windings.

Maybe NP will chime in and set us straight.

Bill Fuss · 5th August 2010, 05:30 PM

Yeah, I could see that after you brought it up. Either we're dummies or the dwg is in error. I'm going to stare at it a while longer.

frags · 12:55 AM

Looks like something wrong with it. R17 is shortened at all.

MEnsing · 6th August 2010, 05:49 AM

That R17 is shortened is my mistake. I have edited the schematic and removed the part that was not relevant, because I don't want to publish the original schematic here.

Bill Fuss · 6th August 2010, 10:11 AM

That jumper is an obvious mistake. The problem is in the bridge wiring, it can't work as drawn.

5th August 2010, 02:08 PM	#1
MEnsing diyAudio Member Join Date: Jul 2002 Location: Netherlands	Power supply connections For my Aleph-JX I use per channel two transformers (Amplimo 2x18V) and four recifier bridges. power.jpg First I wanted to parrallel the secondaries as within this picture; Amplimo_parrallel.JPG But then I saw the following schematic of a pass labs power supply; passlabs_supply.JPG I haven't seen this way of connecting before and I don't understand it well. Do the phases of the secondaries need to be out of phase with each other or is this possible with just any kind of transformer?

6th August 2010, 12:47 AM	#8
frags diyAudio Member Join Date: Aug 2009	Looks like something wrong with it. R17 is shortened at all. Last edited by frags; 6th August 2010 at 12:55 AM.

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5th August 2010, 02:26 PM	#2
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	That is slightly unusual but tying center taps to the neutral cuts the rail voltage in half and I imagine doubles the available current. I'll have to stare at it for a while.

5th August 2010, 02:47 PM	#3
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	Instantainious current would stay the same but the duty cycle is cut in half I believe.

5th August 2010, 04:30 PM	#4
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Is it me or is there a diode drop away from a short when A swings negative relative to 0? Could it be a drawing error?

5th August 2010, 04:55 PM	#5
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	I think the center taps are being held at 0 by the interconnection of the trafos. Does that make sense. It's a little hard to get my head around.

5th August 2010, 05:14 PM	#6
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	I see a short from T2 secondary terminal 0 the CT connection between T2 and T3 to the Neutral line, to the negative terminal of BR3, through the lower left diode to T2 terminal A. That's the easiest to see, but the 50% duty cycle short exists for all windings. Maybe NP will chime in and set us straight.

5th August 2010, 05:30 PM	#7
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	Yeah, I could see that after you brought it up. Either we're dummies or the dwg is in error. I'm going to stare at it a while longer.

6th August 2010, 05:49 AM	#9
MEnsing diyAudio Member Join Date: Jul 2002 Location: Netherlands	That R17 is shortened is my mistake. I have edited the schematic and removed the part that was not relevant, because I don't want to publish the original schematic here.

6th August 2010, 10:11 AM	#10
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	That jumper is an obvious mistake. The problem is in the bridge wiring, it can't work as drawn.