System and method for controlling a computer drive motor
First Claim
1. A computer system comprising:
- a media device, which media device may be driven;
a drive motor connected to said media device, which drive motor operates to rotationally drive said media device and which drive motor has an input terminal capable of receiving power to enable said drive motor to operate;
a battery having an output terminal on which a first electric potential is provided;
a motor speed control circuit connected electrically between said drive motor and said battery, said motor speed control circuit capable of applying said first electric potential provided on said first output terminal of said battery to said input terminal of said drive motor, wherein said motor speed control circuit includes means for ensuring that said first electric potential provided on said output terminal of said battery does not exceed a maximum electric potential that can be accepted by said drive motor before applying said first electric potential to said input terminal of said drive motor;
a DC to DC converter electrically connected to said battery, and having an output terminal at which a second electric potential is provided wherein said second electric potential is lower than said first electric potential; and
a drive electronics circuit coupled to said output terminal of said DC to DC converter for reading data stored on said media device;
whereby said drive electronics circuit receives power provided through said output terminal of said DC to DC converter and whereby said drive motor is powered independent of said DC to DC converter.
7 Assignments
0 Petitions
Accused Products
Abstract
A battery powered computer system has a drive motor and a motor speed control. The motor speed control receives electrical power from an unregulated source in the computer, such as a battery. The motor speed control may include a pulse width modulator which pulsates received electric potential for use by the drive motor. The motor speed control may also contain control circuitry which controls the supply of pulsated electrical power to the drive motor. The control circuitry may also supply the pulsated voltage to the drive motor in duty cycles based on feedback from the drive motor to the control circuitry. For large voltage power supplies, the motor controller may have a voltage limiter to limit the maximum voltage from the power supply to the pulse width modulator.
8 Citations
10 Claims
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1. A computer system comprising:
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a media device, which media device may be driven; a drive motor connected to said media device, which drive motor operates to rotationally drive said media device and which drive motor has an input terminal capable of receiving power to enable said drive motor to operate; a battery having an output terminal on which a first electric potential is provided; a motor speed control circuit connected electrically between said drive motor and said battery, said motor speed control circuit capable of applying said first electric potential provided on said first output terminal of said battery to said input terminal of said drive motor, wherein said motor speed control circuit includes means for ensuring that said first electric potential provided on said output terminal of said battery does not exceed a maximum electric potential that can be accepted by said drive motor before applying said first electric potential to said input terminal of said drive motor; a DC to DC converter electrically connected to said battery, and having an output terminal at which a second electric potential is provided wherein said second electric potential is lower than said first electric potential; and a drive electronics circuit coupled to said output terminal of said DC to DC converter for reading data stored on said media device; whereby said drive electronics circuit receives power provided through said output terminal of said DC to DC converter and whereby said drive motor is powered independent of said DC to DC converter. - View Dependent Claims (2, 3)
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4. A method for powering a drive motor in a computer system powerable by a battery, which drive motor must be spun up when starting, said method comprising the steps of:
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providing a first electric potential from said battery to said drive motor through a modulator to thereby rotationally drive said drive motor; pulsating said first electric potential provided to said drive motor from said battery; controlling a pulse duration associated with said first electric trial provided to said drive motor by lengthening aid pulse duration to increase power delivery to said drive motor and by shortening said pulse duration to decrease power delivery to said drive motor; generating a second electric potential within a DC to DC converter wherein an input terminal of said DC to DC converter is coupled to receive power from said battery and wherein said second electric potential has an amplitude that is less than said first electric potential; and providing said second electric potential from said DC to DC converter to a drive electronics circuit, wherein said drive electronics circuit is configured to read data stored on a media device driven by said drive motor. - View Dependent Claims (5)
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6. A portable computer system comprising:
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a disk drive including a drive motor for spinning a data storage disk, which drive motor has an input terminal to which an electric potential may be applied to enable it to operate; a battery having an output terminal on which a first output voltage is provided; a switching regulator, said switching regulator connected in circuit between said output terminal of said battery and said input terminal of said drive motor, said switching regulator receiving said first output voltage from said battery, pulsating said first output voltage, and thereby providing said first output voltage to said input terminal of said drive motor to enable it to operate; a DC to DC converter electrically connected to said battery, wherein said DC to DC converter includes an output terminal at which a second output voltage which is lower than said first output voltage is provided; a drive electronics circuit coupled to said output terminal of said DC to DC converter for reading data stored on said media device; whereby said drive electronics circuit receives power through said output terminal of said DC to DC converter and whereby said drive motor is powered independent of said DC to DC converter; and wherein a duty cycle of said first output voltage controls a speed of rotation of said drive motor. - View Dependent Claims (7, 8, 9, 10)
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Specification