Browse Prior Art Database

High Availability Power Bus System

IP.com Disclosure Number: IPCOM000100758D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 6 page(s) / 223K

Publishing Venue

IBM

Related People

Marshall, JR: AUTHOR

Abstract

Fig. 1 shows a block diagram of a typical box for which this invention is applicable. At the box boundary, various system buses connect the box to the rest of the spacecraft. Also at the box boundary, some source of input power is provided. Each type of card will normally have one or more spares in such a box to allow the box to reconfigure itself when a card: experiences a hard fault. Notice that there are two power buses to the cards, A power and B power. These are alternately connected to the various card types such that each card is powered by one bus or the other and there are at least two separate bused groups with mains and spares that represent all the required cards for a functional box.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 36% of the total text.

High Availability Power Bus System

       Fig. 1 shows a block diagram of a typical box for which
this invention is applicable.  At the box boundary, various system
buses connect the box to the rest of the spacecraft. Also at the box
boundary, some source of input power is provided.  Each type of card
will normally have one or more spares in such a box to allow the box
to reconfigure itself when a card: experiences a hard fault.  Notice
that there are two power buses to the cards, A power and B power.
These are alternately connected to the various card types such that
each card is powered by one bus or the other and there are at least
two separate bused groups with mains and spares that represent all
the required cards for a functional box. If there is more than one
spare per card type, it may be possible to construct multiple groups
of a functioning card set on each power bus.

      There are two main types of box buses:  system buses which
handle the functional requirements of the box and diagnostic/control
buses which handle the diagnostic, debug, test and reconfiguration
functions for the box.  Each of these buses will normally be
duplicated one or more times to eliminate single points of failure
and allow the box to recover repeatedly from bus faults.  One or more
of the diagnostic/control buses may actually originate outside the
box, depending on the maintainability requirements of the system.
The diagnostic/control buses are used to monitor and reconfigure the
power converter.  It is assumed that any bus allowing multiple
masters (serial or parallel) may be used for the diagnostic/control
buses.  At least two powered cards (one on each power bus) will have
the processor and programming necessary to react to a power failure
on one of the two power buses.  Whether these cards are identical or
different is not important, only that they are able to communicate
with the power block over at least two diagnostic/control buses.  A
short at any point of the box will cause only one power bus to go
down; the other power bus will continue to provide power to cards
that are connected to it. Therefore, at least one processor will
still be operational and will be able to accept the interrupt or
status line informing it of the short on a power supply and take
appropriate action to isolate the short and reconfigure the system.

      Fig. 2 shows more detail of the power block.  The input power
source is connected to the various power converters (operating units
and spares).  If spares are to be disconnected from power when not in
use (cold spare versus the shown no-load spare), then a set of
switching relays would also be required between the input power
source and power converters, controlled by additional power control
registers.

      The output of the power converters is then fed into the power
switching relays block.  This will be explained further later in the
text.  These relays are controlled by power control...