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Old 6th September 2002, 12:56 AM   #1
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Default Stacking toroids - Ok?

Hi,

I would like to stack two toroids in a preamp. Do I need to do anything special. I know not to create a loop, but would they mutually couple.

Thanks,


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Old 6th September 2002, 01:14 AM   #2
Duo is offline Duo  Canada
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Well, it can be done, but if there are any differences in the transformers, (which there usually is), then you will have some current flow between them which you don't want. One thing that could be done to balance out any differences like this is to use 0.1 ohm resistors with the transformers so they arent connected right to eachother. But usually you can get away with just connecting them together without a problem especially if they are the same model and manufacturer of transformer.
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Old 6th September 2002, 05:43 AM   #3
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Default Transformers in parallel

Hi

How about using a bridge for each transformer, and let them share the caps ?

\Jens
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Old 6th September 2002, 05:46 AM   #4
hifiZen is offline hifiZen  Canada
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In general I think this is not a good idea. If you get the phase connections wrong, the two transformers will buck against each other, possibly leading to overheating and destruction (or so I've heard, anyway... I've always avoided stacking toroids, so don't speak from first-hand experience). If you must stack them, I would put some serious steel shielding in between them, as well as some thick spacers to try and reduce any coupling as much as possible.

You should really try and avoid this if possible, if for no other reason than to avoid the outside chance that you'll do any damage.
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Old 6th September 2002, 07:55 AM   #5
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What do you mean by stacking ?
Placing on top of eachother ? This works good if the toroids are big enough for the application. They tend to heat up faster in this way.
If you mean paralleling or connecting in series, it depends.
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Old 6th September 2002, 09:19 AM   #6
e96mlo is offline e96mlo  Sweden
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Couldn't you check the phase of the transformers with a 'scope so that you connect them right? In that case it should be OK using bridge rectifiers on each transformer and then share caps.

Or have I got it all backwards?

/Marcus
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Old 6th September 2002, 09:24 AM   #7
e96mlo is offline e96mlo  Sweden
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In Elector's Titan 2000 they are doing like that and they don't mension the phase problem. So what is correct and what is not?

/Marcus
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Old 6th September 2002, 10:10 AM   #8
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Stacking toroids is no problem and in won't affect effeciency or something. Neither are they sensitive for coupling. Fact is they run warmer because one side is covered by the other. The only point of attention is making sure the mounting bolt is not making a short turn by touching bare metal parts from the amplifier case. But, that's the same with a single toroid.
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Old 6th September 2002, 01:59 PM   #9
Duo is offline Duo  Canada
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Okay, let me help clear this up...

If you physically stack the transformers, their magnetic flux might be out of phase and they can damage eachother because there's enough magnetic flux to couple them together as one transformer.

If you electronically stack them, they work fine usually but they must be in phase as well. It is actually a good idea to make them share the capacitors after the bridge outputs than connect them right together. This way, the voltage is already rectified and things are usually more tolerant this way...

I hope this clears up some stuff here.
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Old 6th September 2002, 02:20 PM   #10
skaara is offline skaara  Slovenia
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Can you stack them both ways, paralel or in series? I have 2x1.5kW/72V, can I connect them in paralel so it would become 3kW/2x72V? I would put then one near another like this (each O is a toroid if you look from a "bird" perspective) O O is this ok?
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