Browse Prior Art Database

Power On Control of Input/Output Device without Alternating Current Power

IP.com Disclosure Number: IPCOM000122871D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Hayase, T: AUTHOR [+2]

Abstract

Disclosed is a method of controlling Input/Output (I/O) power on sequence to reduce a large number of Inrush Current.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 90% of the total text.

Power On Control of Input/Output Device without Alternating Current
Power

      Disclosed is a method of controlling Input/Output (I/O) power
on sequence to reduce a large number of Inrush Current.

      For instance, RS/6000* and RS/6000 SP* are connected by many
I/Os.  Usually, they start the Power On Sequence all at once after
pushing the Power On Button.  Depending on the number of attached
I/Os, large Inrush Current is measured, which is large enough to
suspend the  system power on complete.  In order to prevent Power On
Failure by the  Inrush Current, a typical method is to use a Power On
Delay Control Box,  which requires an Alternating Current (AC)
voltage source.  The function  of this Power On Delay Control Box is
to generate a power on start signal  after predefined timing.  So
that maximum Inrush Current in total system  is decreased.  This
disclosure enables to provide the same function, however, AC voltage
source is not required.  A typical method of Power  On Delay Control
Box is shown in Fig. 1.  AC voltage source is required  to generate
DC voltage.

      Fig. 2 utilizes a characteristic of power on signal, which
comes from SERVER, and the control logic can bypass power on signal
as delayed Power On Signal without additional AC voltage.  Following
are brief operation steps:
  Step-1:  Power On Signal  initiates Timer Relay.
  Step-2:  After predetermined time frame, contact of Timer Relay
            will be ON...