Power On Control of Input/Output Device without Alternating Current Power
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Hayase, T: AUTHOR [+2]
Disclosed is a method of controlling Input/Output (I/O) power on sequence to reduce a large number of Inrush Current.
Power On Control of Input/Output Device without
a method of controlling Input/Output (I/O) power
on sequence to reduce a large number of Inrush Current.
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
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...