Apparatus for driving a brushless motor

Details Apparatus for driving a brushless motor Apparatus for driving a brushless motor

2007-01-16

2007-01-16

Pham, Toan N. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S648000, C324S500000, C324S522000

Reexamination Certificate

active

11019285

ABSTRACT:
A control unit for a brushless motor has an upper-arm current detector for detecting an electric current flowing into an upper-arm switching transistor for driving the brushless motor, and a lower-arm current detector for detecting an electric current flowing into a lower-arm switching transistor. The control unit controls the current that flows into the brushless motor based on the upper-arm current value when it is so determined that the lower-arm current value cannot be detected. The control unit detects abnormal condition in the first current detector based on the upper-arm current value.

REFERENCES:
patent: 6148949 (2000-11-01), Kobayashi et al.
patent: 6223852 (2001-05-01), Mukai et al.
patent: 6459972 (2002-10-01), Kodaka et al.
patent: 6779626 (2004-08-01), Matsuoka et al.
patent: 7040450 (2006-05-01), Nagase et al.
patent: A-2003-164159 (2003-06-01), None

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