Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2007-05-01
2007-05-01
Ip, Paul (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S132000, C318S434000
Reexamination Certificate
active
11179593
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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Chui Siew Yong
Hoo, legal representative Kuong
Kumar Vishnu
Ip Paul
Marvell Asia PTE, Ltd.
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