Claims
- 1. A power source for a disk drive to handle an Emergency Power Off event that comprises:
a storage capacitor; a voltage source that outputs a first voltage that is applied as input to the storage capacitor; a tester, responsive to the first voltage and a reference voltage; and an adjustable voltage source, responsive to the tester output, that outputs a second voltage that is applied as input to the storage capacitor.
- 2. The power source of claim 1 wherein a sum of the first voltage and the second voltage is substantially constant.
- 3. The power source of claim 1 which further comprises a voltage reference that outputs the reference voltage.
- 4. The power source of claim 2 wherein the constant is close to, but below, a maximum allowed operating voltage of the storage capacitor.
- 5. The power source of claim 1 which further comprises a switching mechanism; wherein the switching mechanism connects a voice coil actuator of the disk drive to a voice coil driver of the disk drive or the storage capacitor.
- 6. The power source of claim 5 wherein the switching mechanism comprises a switch control and a switch, and wherein the switch control causes the switch to connect the voice coil actuator to the storage capacitor upon detection of an Emergency Power Off event.
- 7. The power source of claim 5 which further comprises a supplemental capacitor that supplies power to the switching mechanism upon occurrence of an Emergency Power Off event, wherein the first voltage is applied as input to the supplemental capacitor.
- 8. The power source of claim 1 wherein the tester output comprises a measure of a difference between the first voltage and the reference voltage.
- 9. A power source for a disk drive to handle an Emergency Power Off event that comprises:
a storage capacitor; a voltage source that outputs a first voltage that is applied as input to the storage capacitor; a voltage reference that outputs a reference voltage; a tester, responsive to the first voltage and the reference voltage; an adjustable voltage source, responsive to the tester output, that outputs a second voltage that is applied as input to the storage capacitor; a switch that connects a voice coil actuator of the disk drive to a voice coil driver of the disk drive or the storage capacitor; wherein the tester output is a measure of a difference between the first voltage and the reference voltage.
- 10. The power source of claim 9 wherein a sum of the first voltage and the second voltage is substantially constant.
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Application No. 60/429,758, filed on Nov. 27, 2002, which is incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
|
60429758 |
Nov 2002 |
US |