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US 2001/0054874 A1Published application
Spindle motor drive circuit
AssigneeNEC Corporation
InventorKoichiro Oku
Life of this patent
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Abstract
The spindle motor drive circuit of the present invention comprises: a power source voltage varying device for varying a voltage applied to a motor by controlling a power source voltage; and a pulse width varying device for varying a pulse width by pulse width modulation.
Claims4
A spindle motor drive circuit having:
- a power source voltage varying device for varying a voltage applied to a motor by controlling a power source voltage;
- and
- a pulse width varying device for varying a pulse width by pulse width modulation.
Dependencies are inferred from the claim text.