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Battery life extending system by using Moter device Back EMF energy

IP.com Disclosure Number: IPCOM000015779D
Original Publication Date: 2002-May-22
Included in the Prior Art Database: 2003-Jun-21
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Abstract

Disclosed is a method for Portable PC power saving to reuse from Hard Disk Drive Spindle Motor Back EMF current. The portable PC's top priority required is power saving, because the portable PC's merit is mobility style. But, recently PC has power full CPU and many optional devices. So, Many PC makers study high power battery to use portable PC at mobile condition for long time. But, It is difficult to development right and long life battery. This disclosure is method that is power saving system by using Back EMF current for portable PC with the Hard Disk Drive. In general, a motor generates electrical current when this rotational spin down. This electrical current said "Back EMF current".

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Battery life extending system by using Moter device Back EMF energy

Disclosed is a method for Portable PC power saving to reuse from Hard Disk Drive Spindle Motor Back EMF current.

 The portable PC's top priority required is power saving, because the portable PC's merit is mobility style. But, recently PC has power full CPU and many optional devices. So, Many PC makers study high power battery to use portable PC at mobile condition for long time. But, It is difficult to development right and long life battery.

This disclosure is method that is power saving system by using Back EMF current for portable PC with the Hard Disk Drive.

In general, a motor generates electrical current when this rotational spin down. This electrical current said "Back EMF current".

 A HDD·(Hard Disk Drive) can stop to save power by BIOS command. When the HDD stop, spindle motor generates Back EMF current.

  In general, old type HDD stop sequence is fast time to work, because HDD head was damaged by touch down shock to contact disk. For old type HDD, the Back EMF current was used for breaking current to stop HDD spindle motor quickly.

 But latest HDD does not use quickly stop sequence, because the HDD have load-unload mechanism to avoid touch down shock. So, the Back EMF current can use this current for portable PC system power.

Drive C urrent

Portable P C Hard Disk D rive

Drive C urrent B ack EM F C urrent

                       Hard Disk D rive trcuiier CPowM otor D river C ircuit

B ack EM F C urrent

B ack EM F C...