Motor drive circuit, fan motor, electronic device, and...

Details Motor drive circuit, fan motor, electronic device, and... Motor drive circuit, fan motor, electronic device, and...

2008-11-20

2011-10-04

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400060, C318S400380

Reexamination Certificate

active

08030866

ABSTRACT:
A motor drive circuit comprising: first and second transistors connected in series, a voltage of a connection-point therebetween being a drive-voltage applied to one end of a motor coil; an operational amplifier for controlling the transistors such that the drive-voltage is a voltage according to a difference between first and second control voltages; a switch circuit for driving the transistors such that the motor coil is in an undriven state regardless of control by the operational amplifier when a pulse-signal is at one logic level, and driving the transistors based on the control when the pulse-signal is at the other logic level; and an auxiliary drive circuit for driving the transistors to increase the drive-voltage for a predetermined time period shorter than a time period of the pulse signal being at the other level regardless of the control, when the pulse-signal changes from the one level to the other.

REFERENCES:
patent: 4308466 (1981-12-01), Cushman et al.
patent: 6229273 (2001-05-01), Kelly et al.
patent: 6956343 (2005-10-01), Berroth et al.
patent: 7271993 (2007-09-01), Plojhar et al.
patent: 2003/0076063 (2003-04-01), Fu
patent: 2004-166379 (2004-06-01), None

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