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Old 5th August 2010, 02:08 PM   #1
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Default 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?
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Old 5th August 2010, 02:26 PM   #2
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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.
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Old 5th August 2010, 02:47 PM   #3
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Instantainious current would stay the same but the duty cycle is cut in half I believe.
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Old 5th August 2010, 04:30 PM   #4
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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?
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Old 5th August 2010, 04:55 PM   #5
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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.
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Old 5th August 2010, 05:14 PM   #6
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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.
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Old 5th August 2010, 05:30 PM   #7
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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.
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Old 6th August 2010, 12:47 AM   #8
frags is offline frags  Canada
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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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Old 6th August 2010, 05:49 AM   #9
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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.
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Old 6th August 2010, 10:11 AM   #10
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That jumper is an obvious mistake. The problem is in the bridge wiring, it can't work as drawn.
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