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Controling a switch of power source line by SCSI TERM POWER

IP.com Disclosure Number: IPCOM000015700D
Original Publication Date: 2002-Apr-01
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue

IBM

Abstract

Disclosed is a circuit for controling the Power Supply Unit (PSU) ON/OFF by SCSI TERM POWER. SCSI TERM POWER is one of SCSI bus lines. Although the usual PSU spends power when the PSU is power OFF, this invention enables not to spend any power then. Based on this invention, the switch "SW1" (in the figure) between the bridge diode and the Power Factor Correction (PFC) circuit is controlled by the SCSI TERM POWER line from the host computer. When the host computer turns on, its installed cards becoms ON. The SCSI Host Bus Adapter card (HBA) turns ON, too. Then, the HBA can supply power to the SCSI TERM POWER line. Therefore, the host computer can turn ON the SCSI TERM POWER line. This invention uses above mechanism. For explanation of this invention, there are four steps. Figure : Construction of this invention.