Motor driving apparatus, brushless motor, and method for...

Details Motor driving apparatus, brushless motor, and method for... Motor driving apparatus, brushless motor, and method for...

2007-09-11

2010-06-29

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400010, C318S599000

Reexamination Certificate

active

07746014

ABSTRACT:
A motor driving apparatus has first, second, and third positive-side driving transistors having drains which are supplied with a power supply voltage, first, second, and third negative-side driving transistors having sources which are grounded and drains which are connected to sources of the first, second, and third positive-side driving transistors, respectively, a power supply monitoring circuit which monitors the power supply voltage and outputs a driving mode switching signal which has a first value if the power supply voltage is not less than a predetermined value and has a second value if the power supply voltage is less than the predetermined value, and an output PWM control section which switches a mode of driving from synchronous rectification PWM driving to one-way PWM driving on the basis of a change of the driving mode switching signal from the second value to the first value.

REFERENCES:
patent: 5309078 (1994-05-01), Cameron
patent: 6008619 (1999-12-01), Murase et al.
patent: 6153989 (2000-11-01), Kardash et al.
patent: 6528968 (2003-03-01), Seima et al.
patent: 6873125 (2005-03-01), Seima et al.
patent: 2002/0158600 (2002-10-01), Seima et al.
patent: 2002-272162 (2002-09-01), None

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