Browse Prior Art Database

Implementing Hot-Swap Power Supplies

IP.com Disclosure Number: IPCOM000123505D
Original Publication Date: 1998-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

Denny, IM: AUTHOR [+2]

Abstract

Hot-swap power supplies currently require the use of a costly "backplane" printed circuit card to act as the interface between the system planar and the power supplies themselves. This backplane usually carries both DC power and signal connections between the supply and the planar. Cables are then required to carry both power and signals to the planar. This in turn requires costly backplane card and "smart" power supplies.

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Implementing Hot-Swap Power Supplies

   Hot-swap power supplies currently require the use
of a costly "backplane" printed circuit card to act as the interface
between the system planar and the power supplies themselves.  This
backplane usually carries both DC power and signal connections
between the supply and the planar.  Cables are then required to carry
both power and signals to the planar.  This in turn requires costly
backplane card and "smart" power supplies.

   The arrangement described here removes the need for both
the backplane card with its power and signal cables and the need for
any "intelligence" in the power supply itself.

   Referring to Fig. 1 the card is replaced by a simple metal
bulkhead (1) carrying two or more depending on the number of
redundant supplies required.  These connectors and their cables are
directly attached to similar connectors (3) on the planar board (4).

   All power supply monitoring is performed by electronics
on the planar board itself.  Supply good or fail status is
communicated through the existing planar service support circuitry
and by a simple power good/bad signal back to the supply itself.

   As a result very simple cheap supplies (P1, P2) may be
used to provide a fully fuctioning hot-swap power supply
arrangement.  Each power supply carries a single connector (5) to
match that on the bulkhead.

   The power supplies P1, P2 are simply required to convert
AC inlet power to a set of regulated DC power outputs.  The DC
output would automatically provide current as required by the planar
up to a certain set limit.  A signal from the planar indicates that
the power supplied i...