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...

2008-10-15

2010-11-23

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S430000, C318S504000, C318S400210

Reexamination Certificate

active

07839104

ABSTRACT:
A motor drive circuit includes: a pulse generation circuit configured to generate a pulse signal whose duty ratio of one logic level is increased as a drive voltage is increased in accordance with a target rotation speed of a motor; and a drive control circuit that configured to drive the motor with the drive voltage using a duty ratio higher than the duty ratio of the pulse signal when the motor starts rotating from the stopped state, and configured to drive the motor with the drive voltage during a period when the pulse signal is at the one logic level after the motor starts rotating, based on a rotation signal corresponding to the rotation of the motor.

REFERENCES:
patent: 3855520 (1974-12-01), Stich
patent: 4587467 (1986-05-01), Breiner
patent: 5036267 (1991-07-01), Markunas et al.
patent: 6841954 (2005-01-01), Nakabayashi
patent: 2 077 611 (2009-07-01), None
patent: 62-016088 (1987-01-01), None
patent: 05-228291 (1993-09-01), None
patent: 08-266086 (1996-10-01), None
patent: 2006-174648 (2006-06-01), None

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