Magnetic write circuit with pulse mode power supply
AssigneeAgere Systems Inc.
InventorsJong K. Kim, Elanguvan Nainar
Life of this patent
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Abstract
A disk drive system including a write circuit for controlling current through a magnetic write head includes an H-switch circuit and a pulse-mode power supply circuit. The H-switch circuit controls direction of current through the magnetic write head. The pulse-mode power supply circuit is connected to the H-switch circuit for providing a higher voltage pulse at a beginning of a switching event of the H-switch circuit to accelerate a change in direction of current through the write head, followed by a lower voltage until a next switching event.
Claims33
A disk drive system including a write circuit for controlling current through a magnetic write head, the write circuit comprising:
- an H-switch circuit for controlling direction of current through the write head;
- and
- a pulse-mode power supply circuit connected to the H-switch circuit for providing a higher voltage pulse at a beginning of a switching event of the H-switch circuit to accelerate a change in direction of current through the write head, followed by a lower voltage until a next switching event.
A write circuit for controlling current through a magnetic write head, the write circuit comprising:
- a switch network for controlling direction of current through the write head;
- and
- means for selectively connecting the switch network to a higher supply voltage at a beginning of a switching event of the switch network to accelerate a change in direction of current through the write head and then to a lower supply voltage until a next switching event.
Dependencies are inferred from the claim text.