Disk drive power management system
First Claim
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1. An electrical management apparatus for use with a battery-powered computer, comprising:
- an electrical system;
a motor;
means operatively connected to the electrical system for providing that the electrical system establishes a shut down condition when voltage supplied to the electrical system falls below a first level; and
means operatively connected to the electrical system and to the motor for limiting current in the motor during acceleration of the motor to provide that voltage supplied to the electrical system remains above a second level greater than the first level during acceleration of the motor.
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Abstract
A computer having a hard disk drive includes a battery voltage monitor which establishes a shut down condition of the computer if the supply voltage falls below a chosen level VL. Upon start up of the hard disk drive motor, current through the motor is limited so that supply voltage of the battery to a computer does not fall below level V1, which level is greater than the level VL. Additionally during start up, current in the motor is controlled so that voltage supplied by the battery to the computer does not rise above a threshold level V2 which is greater than V1.
41 Citations
13 Claims
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1. An electrical management apparatus for use with a battery-powered computer, comprising:
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an electrical system; a motor; means operatively connected to the electrical system for providing that the electrical system establishes a shut down condition when voltage supplied to the electrical system falls below a first level; and means operatively connected to the electrical system and to the motor for limiting current in the motor during acceleration of the motor to provide that voltage supplied to the electrical system remains above a second level greater than the first level during acceleration of the motor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A disk drive system comprising:
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a voltage sensor which senses a battery voltage; a disk drive motor; and an current controller operably connected to the voltage sensor and the disk drive motor, wherein in response to the voltage sensor indicating the battery voltage is below a first level, the current controller limits a current used by the disk drive motor during acceleration of the disk drive motor and keeps the current from pulling the battery voltage below a second level. - View Dependent Claims (8, 9, 10, 11)
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12. A method for controlling a voltage of a battery which provides power to a computer system and a disk drive, comprising the steps of:
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monitoring the voltage of the battery; shutting down the computer in response to the voltage of the battery falling below a first level; supplying current from the battery to accelerate a motor in the disk drive; and in response to the voltage of the battery falling to a second level which is greater than the first level, reducing the current supplied to the motor to an amount which maintains the voltage of the battery above the first level and still accelerates the motor up to an operating speed. - View Dependent Claims (13)
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Specification