[SI-LIST] Re: Combining of multiple Power Supply Outputs
- From: "Michael Rose" <mrose@xxxxxxxxxxxx>
- To: "chundi srikanth" <chundis@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 12 Jun 2009 11:16:49 -0400
Srikanth,
Do you want to actively share the power supplies or just allow redundant
operation? Load sharing is often used to increase the MTBF of the power
system and is a bit more complex than sensing around a couple of diodes.
Linear, TI, National, and others make "or'ing" controllers. In essence,
these controllers modulate the sense voltage drop based on the
individual current contribution. They can be tricky because you're
adding another control loop to the power supplies. The loop has to be
pretty fast if you want the power supplies to share transient demands.
Also, several companies offer "ideal diodes" that mimic the transfer
characteristics of a diode with a MOSFET but with much lower Vforward
(and much less power loss).
Mike
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of chundi srikanth
Sent: Friday, June 12, 2009 1:42 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Combining of multiple Power Supply Outputs
Hi,
Pls see the attached file.I have two Power supplies giving +28V outputs
and
i have to combine them for load sharing such a way that it will provide
a
low voltage drop from input to output. How can i do that?? Which
solution is
the best one using a MOSFET solution or a schottky diode solution or any
powerpath controller solution??
Thanks & Regards
Srikanth
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