Simplistic Mosfet HV Shunt Regs - Page 274 - diyAudio
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Old 6th February 2012, 10:28 AM   #2731
Salas is offline Salas  Greece
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Originally Posted by massimo View Post
Why?
The scondaries should be correlated.
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Old 6th February 2012, 10:55 AM   #2732
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The scondaries should be correlated.
No.
the dual secondaries of a transformer are isolated. They are not "correlated". The dual secondary transformer creates two independent supplies.
These two supplies are then connected at some common point.

Using two transformers, each with an isolated secondary, achieves the same dual supplies that can be connected at some point.
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Old 6th February 2012, 10:59 AM   #2733
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Possibly in p2p for one, not on the positive board, but I haven't looked into it because I prefer this scheme, which is anti ground loop also:
post2722
It would be better to continue the sense lines separately all the way to the load. The +ve Hot and -ve Hot are both shown separate. The +ve Cold and -ve Cold should be shown the same.
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Old 6th February 2012, 11:35 AM   #2734
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Its just the graphics, that is correct, they should go all the way separate to ground.
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Old 6th February 2012, 11:51 AM   #2735
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Quote:
Originally Posted by AndrewT View Post
No.
the dual secondaries of a transformer are isolated. They are not "correlated". The dual secondary transformer creates two independent supplies.
These two supplies are then connected at some common point.

Using two transformers, each with an isolated secondary, achieves the same dual supplies that can be connected at some point.
All to the better then because even single secondary spare transformers can be used. Although somehow I had this differently registered in mind, I hope its exactly the same as with a common primary as I have only seen it in builds. This uses more components, and losses are higher because of the extra diodes, but this scheme offers easier ground management. It's easier to keep the large charging current pulses away from the system ground.
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Old 6th February 2012, 11:54 AM   #2736
AndrewT is offline AndrewT  Scotland
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It's easier to keep the large charging current pulses away from the system ground.
I have tried, using my limited resources, to measure the difference between dual bridge PSU and centre tapped+single bridge PSU for an effect on hum and noise and rail ripple.

I cannot measure a difference.
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Old 6th February 2012, 12:00 PM   #2737
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Can you use a dual polarity supply with single bridge to power dual SSHV2'.
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Old 6th February 2012, 12:03 PM   #2738
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I have tried, using my limited resources, to measure the difference between dual bridge PSU and centre tapped+single bridge PSU for an effect on hum and noise and rail ripple.

I cannot measure a difference.
The key word is ''easier'', if the system ground is managed already very well there will not be much to improve on.
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Old 6th February 2012, 12:04 PM   #2739
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Yes, but the dual PSU must use a +ve reg and a -ve reg wired in series.
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Old 6th February 2012, 12:05 PM   #2740
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Originally Posted by buzzforb View Post
Can you use a dual polarity supply with single bridge to power dual SSHV2'.
For symmetric +/- with positives no. For more than one positives as positives yes.
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