[SI-LIST] Re: DC Power supplies Connected in parallel
- From: "O. Laney" <olaney@xxxxxxxxx>
- To: erfan@xxxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Sat, 11 Aug 2012 18:49:25 +0000
Power supplies can't be treated as theoretical sources of the pspice
kind plus output impedance. Your typical positive supply can only
source current and can't sink it. If the outputs of a 5V and 12V supply
are tied together, the 12V supply will pull the 5V supply above its set
point and the regulation loop in the 5V supply will turn off the pass
transistor. Whether the 5V output can pull clear to 12V without
something breaking down is a matter of supply design. For instance, the
output caps in the 5V supply will likely be rated for less than 12V and
might not survive the overvoltage for very long. The pass transistor
might break down from the inverted voltage (...or not. The raw voltage
is probably 9 to 12V.)
Orin
------ Original Message ------
From: "Erfan" <erfan@xxxxxxxxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: 8/11/2012 2:13:59 AM
Subject: [SI-LIST] DC Power supplies Connected in parallel
>Hai Everyone,
>
>
>I have few questions regarding the DC power supplies.
>
>
>
>What happens when 2 DC-power supplies are connected in parallel which has 2
>different voltages let say one has 12V and other has 5V. What happens to
>their voltage and current, current has to get added up to my knowledge does
>it really happen in this case? What happens to voltage do I see 12V or 5V?
>what happens in case of grounds are isolated and not isolated? If I have to
>generate more current using 2 DC supplies in parallel then what care or
>configuration I should use. Wanted to know the practical limitations of
>using them.
>
>
>
>Kindly through some light in this regard.
>
>
>
>Regards,
>
>Erfan
>
>
>
>
>
>------------------------------------------------------------------
>To unsubscribe from si-list:
>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
>or to administer your membership from a web page, go to:
>//www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
>List forum is accessible at:
> http://tech.groups.yahoo.com/group/si-list
>
>List archives are viewable at:
> //www.freelists.org/archives/si-list
>
>Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
