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Old 20th October 2019, 07:59 AM   #251
Rinman77 is offline Rinman77
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Quote:
Originally Posted by jean-paul View Post
You attached the answer (from tvicol) in your post. Please read carefully.

Would you be referring to,

"This do not matter much when is used with two diodes for rectification."
I first understood that he was referring to traditional rectification. Are you saying it refers to use with the 4321? Or am I entirely missing your point?
If I'm not missing your point then it's good news and I will proceed.
Ron
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Old 20th October 2019, 08:00 AM   #252
jean-paul is offline jean-paul  Netherlands
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It says that you can use 2 ideal rectifiers in your situation BUT that both windings need to be connected right. They usually are connected right with CT transformers but if you have the accidental other type you will have smoke.

Quote:
Originally Posted by tvicol
I can confirm that LT4320 will work just fine in such configuration, CT transformer, because I already used in several applications.

What matter is phase on secondaries to be same.
Some symmetric transformer secondaries are winded at once and this lead to one center taped secondary, but with two sections in anti-phase.
This do not matter much when is used with two diodes for rectification.

So, my advice is to use a transformer with two separate secondaries and make sure these are in phase, or use two transformers each with one secondary and, again, make sure these are in phase.

Regards,
Tibi
So: you need to verify that your transformer has both windings connected right. That is all. And please mention transformer with its AC voltages. You mentioned a transformer with + and - 42V which is wrong terminology. Using the right terminology works best for all.

Do not connect anything to the secondary side. Plug in the transformer (work safe!) and now measure between the outer connections and ignore CT. If you see the specified voltage x2 you can continue. If you see a very low voltage they are connected wrong for the LT4320 solution.
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Last edited by jean-paul; 20th October 2019 at 08:12 AM.
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Old 20th October 2019, 11:44 AM   #253
Rinman77 is offline Rinman77
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Quote:
Originally Posted by jean-paul View Post
Do not connect anything to the secondary side. Plug in the transformer (work safe!) and now measure between the outer connections and ignore CT. If you see the specified voltage x2 you can continue. If you see a very low voltage they are connected wrong for the LT4320 solution.

OK. I have a 120 VAC in / 84 VAC out transformer with CT. Secondaries are definitely in phase. I can use this transformer with 2 x 4320 to feed +/- 60 VDC rails on my amp. If this is true I can go ahead and push the button on my Digi-key order.
Thanks for the help getting clear on this!
(If I'm not clear on this, let me know.)

Ron
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Old 20th October 2019, 11:48 AM   #254
jean-paul is offline jean-paul  Netherlands
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Hard one still as the LT4320 has a absolute maximum input of 80V AC. Well I don't know, I haven't used them like that so I can not give hard evidence. In fact I just finished my first PCB's but boy they measure very well! I would take the challenge as I see the logic behind it when reading tvicol's post but things can be damaged if it does not work out OK.

I think you need to PM tvicol as het has quite some experience. Or the member that had them ending up in smoke (some posts ago). I would be very sorry if I misinterpreted and gave you non optimal information.
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Last edited by jean-paul; 20th October 2019 at 11:56 AM.
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Old 20th October 2019, 06:23 PM   #255
Rinman77 is offline Rinman77
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Quote:
Originally Posted by jean-paul View Post
Hard one still as the LT4320 has a absolute maximum input of 80V AC.
Just to clarify, I was proposing to connect 1 lead of the secondary and CT to one 4320 so that it would see only 42VAC, or ~ 60 VDC at the output. I would connect CT and the other lead of the secondary (the out-of-phase counterpart) to the other 4320. I would then measure potential between outputs of 4320 in order to find the pair which are (hopefully) at zero potential--these would define 0 volts between my rails, with the remaining outputs at +/- 60 VDC.

I guess the best way is to try it out (carefully) and see what happens. I may also buy a smaller transformer, 12 VDC or so, and see if the idea works at those low voltages before trying it on my larger transformer.
Ron
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Old 21st October 2019, 09:54 AM   #256
tvicol is offline tvicol  Europe
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Quote:
Originally Posted by Rinman77 View Post
Tibi,

I have a transformer with a single secondary: +42 & -42 referenced to a single CT. Is it possible to use 2 x LT4320 and feed one of them CT and +42VAC, and the other -42VAC and CT, and thus feed 1 rail from the output of one 4320, and the other rail from the output of the other, with CT as defining ground between the rails?...
No, it's not possible. Is not possible with two normal diode bridges either.
You need two separate secondaries each with his own bridge.

Regards,
Tibi
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Old 21st October 2019, 10:04 AM   #257
tvicol is offline tvicol  Europe
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Quote:
Originally Posted by nautibuoy View Post
How's this development working out Tibi?

I have a project in-hand where I think I could make good use of a pair of these; 105VAC transformer secondary.
Development has ended. Production is hard. Sourcing the mosfets delayed production in mid November.

Saligny HV is performing above my expectations. It was tested in 4 amplifiers. Two Class A, one AB and one D. Sonic improvement was substantial in all of them.
So far any circuit that got synchronous rectification got far better performance.

Regards,
Tibi
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Old 21st October 2019, 12:32 PM   #258
nautibuoy is offline nautibuoy  United Kingdom
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Quote:
Originally Posted by tvicol View Post
Development has ended. Production is hard. Sourcing the mosfets delayed production in mid November.

Saligny HV is performing above my expectations. It was tested in 4 amplifiers. Two Class A, one AB and one D. Sonic improvement was substantial in all of them.
So far any circuit that got synchronous rectification got far better performance.

Regards,
Tibi
Thanks Tibi. So can I look forward to being able to make a purchase soon?

If so, I think that with their current capacity (25A?) I could run my two CLCLC power supplies off one Saligny HV? I guess they'll be quite expensive and not readily available so that arrangement might suit my pocket and avoid me being too selfish by buying more than I actually need.

What will be the means of purchasing them - through your website?

Cheers

Last edited by nautibuoy; 21st October 2019 at 12:35 PM.
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Old 21st October 2019, 12:49 PM   #259
analog_sa is online now analog_sa  Europe
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Ideal bridge rectifier GB
Quote:
Originally Posted by jean-paul View Post
If you see the specified voltage x2 you can continue. If you see a very low voltage they are connected wrong for the LT4320 solution.
It is exactly the opposite. You can have a centre tap working with a single 4320 only if you construct the centre tap yourself out of two separate secondaries. No factory made centre tapped transformer will work.

This should be mentioned at the first post of this thread.
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Old 21st October 2019, 07:14 PM   #260
Rinman77 is offline Rinman77
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Quote:
Originally Posted by tvicol View Post
No, it's not possible. Is not possible with two normal diode bridges either.
You need two separate secondaries each with his own bridge.
Regards,
Tibi
Thank you very much for your input. So just to confirm, I can implement 4320 in my +/- 60 VDC amplifier, but I need a different transformer with two sets of secondaries which are in phase, + two 4320's?
Thanks again,
Ron
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