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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
Document File: 2 page(s) / 54K

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.

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Controling a switch of power source line by SCSI TERM POWER

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.

Step 1) SCSI TERM POWER ON (Host computer ON)

At first, in the figure, the switches "SW1" and "SW2" are OFF. And "SW3" is ON. Then, when the host computer is ON (SCSI TERM POWER ON), the power from the SCSI TERM POWER charges the capaciter "C" in the figure. The charging continues until that "C" reaches some voltages (e.g. +5V).

Step 2) "SW2" is ON

When the "C" has reached some voltages (e.g. +5V), "SW3" becomes OFF and "SW2" becomes ON. And the current flows through the primary of the Trans. Then, the induced current can flow through the

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secondary of the trans. The induced current makes the transistor "Tr1" ON, then the "SW1" becomes ON (Assuming that the "Config S...