Motor drive device, method, and cooling device using the same

Details Motor drive device, method, and cooling device using the same Motor drive device, method, and cooling device using the same

2011-03-29

2011-03-29

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S778000, C318S400040

Reexamination Certificate

active

07915843

ABSTRACT:
In the motor drive apparatus, a Hall element outputs a first sinusoidal signal and a second sinusoidal signal, of mutually opposite phases, in accordance with rotor position. A hysteresis comparator compares the first sinusoidal signal and the second sinusoidal signal outputted from the Hall element, and outputs a rectangular wave signal. A pulse width modulation signal generation circuit detects timing at which phase switches, based on the first sinusoidal signal and the second sinusoidal signal outputted from the Hall element, and outputs a pulse width modulation signal in which duty ratio gradually changes, in a predetermined time-period in which the phase switches. A drive circuit combines the rectangular wave signal and the pulse width modulation signal by a logical operation, and drives the fan motor.

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Office Action for Chinese Patent Application No. 200680028137.1 issued Sep. 11, 2009 with English translation.

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