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Ideal bridge rectifier GB

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#225
Thank for you Answer!

The transformer in the schematic is not correct drawn. The real transformer has one winding with a CT. So I can´t reverse the winding. The same secondary with the CT is working with a normal diode rectifier.
The output voltage of the LT4320 between + to CT (CT not connected to GND) and CT to - is different, as I remember the difference is 19V and 24V without load.

So the question is why the LT4320 has unbalanced output Voltage?
I suspect that the LT4320 is NOT suitable for use with CT transformer. But I could not find any hint about that.
 
#229
dremeier said:
Thank for you Answer!

The transformer in the schematic is not correct drawn. The real transformer has one winding with a CT. So I can´t reverse the winding. The same secondary with the CT is working with a normal diode rectifier.
The output voltage of the LT4320 between + to CT (CT not connected to GND) and CT to - is different, as I remember the difference is 19V and 24V without load.

So the question is why the LT4320 has unbalanced output Voltage?
I suspect that the LT4320 is NOT suitable for use with CT transformer. But I could not find any hint about that.
Click to expand...


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
 
Last edited by a moderator:
#231
tvicol said:
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
Click to expand...


From my understanding:
a) if the 2 secondaries (2x15V with CT) are in phase I would measure = 30V AC.
b) if the secondaries (2x15V with CT) are not in phase I would measure 0V.
Measure from one end to the other.

c) if measure from CT to one end each = 15V AC, even if the phase is not the same.

So in case b) it`ll not be possible to get +- or any voltage out of the rectifier?

So in my case the winding (15-0-15) must be in phase, otherwise I wouldn't get any voltage, right?
 
Last edited:
#233
dremeier said:
From my understanding:
a) if the 2 secondaries (2x15V with CT) are in phase I would measure = 30V AC.
b) if the secondaries (2x15V with CT) are not in phase I would measure 0V.
Measure from one end to the other.

c) if measure from CT to one end each = 15V AC, even if the phase is not the same.

So in case b) it`ll not be possible to get +- or any voltage out of the rectifier?

So in my case the winding (15-0-15) must be in phase, otherwise I wouldn't get any voltage, right?
Click to expand...

edit: a) and b) is true in the opposite way. Meaning if in phase = 0V, if phase is 180° = 30V.
here is a nice guide
 
#234
solved, center tapped Transformer with LT4320

as tvicol mentioned, the secondaries phase of the transformer must be in phase if you use the LT4320 with a center tapped transformer.
Here is a transformer with two equal secondaries:
WU2V1.png

Normally the two secondaries are connected at 4 and 5 to get the CT. Then 3 and 6, respect to the CT, are out of phase by 180°. To get the secondaries in phase, 3 and 5 must connected to get the CT. Then 4 and 6 are in phase.

This behavior I can´t understand but it works with the LT4320.

Many thanks to tvicol who pointed me in the right direction!:worship:
 
#236
dremeier said:
as tvicol mentioned, the secondaries phase of the transformer must be in phase if you use the LT4320 with a center tapped transformer.
Here is a transformer with two equal secondaries:
WU2V1.png

Normally the two secondaries are connected at 4 and 5 to get the CT. Then 3 and 6, respect to the CT, are out of phase by 180°. To get the secondaries in phase, 3 and 5 must connected to get the CT. Then 4 and 6 are in phase.

This behavior I can´t understand but it works with the LT4320.

Many thanks to tvicol who pointed me in the right direction!:worship:
Click to expand...

OK, I get that. But that also means there is no advantage for a CT transformer. Using a xformer with a single secondary and putting the two LT4320 circuits in parallel has exactly the same functionality then.

Jan
 
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