Browse Prior Art Database

On/Off Control for Power Supply FRU Isolation

IP.com Disclosure Number: IPCOM000115616D
Original Publication Date: 1995-May-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Allard, DJ: AUTHOR [+3]

Abstract

Disclosed is a method and apparatus for performing isolated diagnostics on power supply units in an electronic system having a plurality of connectors for electronic system interconnections and one or more system on/off control switches.

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This is the abbreviated version, containing approximately 52% of the total text.

On/Off Control for Power Supply FRU Isolation

      Disclosed is a method and apparatus for performing isolated
diagnostics on power supply units in an electronic system having a
plurality of connectors for electronic system interconnections and
one or more system on/off control switches.

      The Figure provides an example of a power supply unit.  The
power supply unit consists of an internal voltage supply 10 having a
positive signal terminal 11 and a negative signal terminal 12, a
pulse width modulator 60 for power conversions with a control
terminal 61 and an output terminal 65.  Output terminal 65 attaches
to system connector 70 to provide connection to the electronic
system.  Attached to system connector 20 is a set of switches
comprised of main system switch 30 and remote on/off control switch
40.  Continuing further with the power supply unit is a power supply
control circuit 100.  The power supply control circuit 100 consists
of: a ground terminal 102; an on/off voltage comparator 50 having a
positive input terminal 51, a negative input terminal 52 and an
output terminal 53 connected to control terminal 61 of pulse width
modulator 60; a positive feedback resistor R4 for voltage regulation,
which is connected across the positive input terminal 51 and the
output terminal 53 of the voltage comparator 50; a first voltage
divider network R1 and R3 connected between positive terminal 11 of
internal voltage supply 10 and ground 102, providing a first
reference voltage to the positive terminal 51 of the voltage
comparator 50; a se...