System and process for utilizing back electromotive force in disk drives
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United States of America Patent
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Nov 23, 2010
Issued Date -
N/A
app pub date -
Jun 29, 2009
filing date -
Jan 7, 2005
priority date (Note) -
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Abstract
A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utilized in a circuit using negative voltage to drive some switches, such as positive channel metal oxide semiconductor (“PMOS”) driver transistors, to reduce and/or effectively minimize the on-resistance of the switches while delivering the current from BEMF voltage of the motor to another device, such as a motor that retracts controls a read/write head.
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