Power failure management in disk drives
First Claim
Patent Images
1. A disk drive comprising:
- a disk;
a head configured to write data to the disk;
a microactuator configured to actuate the head;
an interface operable to receive a host supply voltage;
a power storage device configured to store a backup voltage;
a voltage booster configured to receive the host supply voltage at a voltage booster input and generate a boosted host supply voltage; and
control circuitry configured to, in response to a power failure event;
disconnect the voltage booster input from the host supply voltage and connect the voltage booster input to the backup voltage;
generate a boosted backup voltage using the voltage booster; and
power the microactuator using the boosted backup 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
18 Claims
-
1. A disk drive comprising:
-
a disk; a head configured to write data to the disk; a microactuator configured to actuate the head; an interface operable to receive a host supply voltage; a power storage device configured to store a backup voltage; a voltage booster configured to receive the host supply voltage at a voltage booster input and generate a boosted host supply voltage; and control circuitry configured to, in response to a power failure event; disconnect the voltage booster input from the host supply voltage and connect the voltage booster input to the backup voltage; generate a boosted backup voltage using the voltage booster; and power the microactuator using the boosted backup voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A device comprising:
control circuitry configured to; provide a host supply voltage received via an interface to a voltage booster over an input of the voltage booster; use the voltage booster to generate a boosted host supply voltage from the host supply voltage; and during a power failure; disconnect the voltage booster input from the host supply voltage and connect the voltage booster input to a power storage device storing a backup voltage; use the voltage booster to generate a boosted backup voltage; and power a microactuator using the boosted backup voltage, the microactuator being configured to actuate a head of a disk drive. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
Specification