DISK DRIVE CHARGING CAPACITOR USING MOTOR SUPPLY VOLTAGE DURING POWER FAILURE
First Claim
Patent Images
1. A disk drive comprising:
- a disk;
a spindle motor operable to rotate the disk;
a head actuated over the disk;
an interface operable to receive a host supply voltage;
a capacitor; and
control circuitry operable to;
use the host supply voltage to charge the capacitor to a capacitor voltage higher than the host supply voltage; and
during a power failure;
stop charging the capacitor using the host supply voltage;
generate a motor supply voltage from the spindle motor;
use the capacitor voltage to operate the control circuitry; and
when the capacitor voltage decays below the motor supply voltage, charge the capacitor using the motor supply voltage.
8 Assignments
0 Petitions
Accused Products
Abstract
A disk drive is disclosed comprising a disk, a spindle motor operable to rotate the disk, a head actuated over the disk, an interface operable to receive a host supply voltage, and a capacitor. The host supply voltage is used to charge the capacitor to a capacitor voltage higher than the host supply voltage. During a power failure, the host supply voltage stops charging the capacitor, and a motor supply voltage is generated from the spindle motor. The capacitor voltage is used to operate control circuitry, and when the capacitor voltage decays below the motor supply voltage, the motor supply voltage charges the capacitor.
-
Citations
8 Claims
-
1. A disk drive comprising:
-
a disk; a spindle motor operable to rotate the disk; a head actuated over the disk; an interface operable to receive a host supply voltage; a capacitor; and control circuitry operable to; use the host supply voltage to charge the capacitor to a capacitor voltage higher than the host supply voltage; and during a power failure; stop charging the capacitor using the host supply voltage; generate a motor supply voltage from the spindle motor; use the capacitor voltage to operate the control circuitry; and when the capacitor voltage decays below the motor supply voltage, charge the capacitor using the motor supply voltage. - View Dependent Claims (2, 3, 4)
-
-
5. A method of operating a disk drive comprising a disk, a spindle motor operable to rotate the disk, a head actuated over the disk, an interface operable to receive a host supply voltage, and a capacitor, the method comprising:
-
using the host supply voltage to charge the capacitor to a capacitor voltage higher than the host supply voltage; and during a power failure; stopping the charging of the capacitor using the host supply voltage; generating a motor supply voltage from the spindle motor; using the capacitor voltage to operate control circuitry; and when the capacitor voltage decays below the motor supply voltage, charging the capacitor using the motor supply voltage. - View Dependent Claims (6, 7, 8)
-
Specification