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Over current protection mechanism for redundant power supply system

IP.com Disclosure Number: IPCOM000015464D
Original Publication Date: 2002-Jan-22
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 61K

Publishing Venue

IBM

Abstract

Disclosed is a OCP(Over Current Protection) mechanism in a redundant power supply unit. Normally, RAID(Redundant Arrays of Inexpensive Disks) or storage enclosure sub system provides redundant power supply units against one of the power supplies damage or unavailability. Power supply units have output OCP mechanism to prevent smoke or fire when some short condition occurs at the output lines. In conventional power supply units, both power supply

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Over current protection mechanism for redundant power supply system

Disclosed is a OCP(Over Current Protection) mechanism in a redundant power supply unit.

Normally, RAID(Redundant Arrays of Inexpensive Disks) or storage enclosure sub system provides redundant power supply units

against one of the power supplies damage or unavailability. Power supply units have output OCP mechanism to prevent

smoke or fire when some short condition occurs at the output lines. In conventional power supply units, both power supply

units have OCP independently even though the output load is shared by the redundant power supply units.

And the OCP value is about 50A for each output line. So, if two redundant power supply units

are installed to the RAID or storage enclosure sub system, about 100A current flows in the system until OCP is initiated.

But from the safety point of view, OCP value should be minimized.

This discloser is related to the OCP mechanism for redundant power supply units. And figure 1 is the block diagram

of the disclosure. Let's assume two power supply units are installed to a system, and let's call power supply units "PSU1" and

"PSU2" respectively. Let's assume there is only one output(like 5V) from the power supply units for simplicity.

The output current of PSU1 is monitored in PSU1 and the output current of PSU2 is monitored in PSU2 respectively.

The monitored current values are added in each power supply unit to calculate the total current in the system. So, each power

supply unit knows the total output current of PSU1 and PSU2. And the added output current value is compared with the

OCP value(50A, in the previous example) in the power su...