Method and apparatus for detecting multiple overcurrent...

Details Method and apparatus for detecting multiple overcurrent... Method and apparatus for detecting multiple overcurrent...

2008-01-29

2008-01-29

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S432000

Reexamination Certificate

active

07323841

ABSTRACT:
A method and an apparatus that permit the detection of multiple overcurrent thresholds, providing system protection particularly but not exclusively in brushless DC motor drive systems, but using only one comparator device instead of multiple comparator devices. The disclosed embodiments predict a higher overcurrent condition based on the time it takes to detect a lower overcurrent condition. Because of the predictive nature of the invention, the higher overcurrent conditions are detected much faster than when using conventional circuitry.

REFERENCES:
patent: 5723960 (1998-03-01), Harada
patent: 6054822 (2000-04-01), Harada
patent: 6170241 (2001-01-01), Shibilski et al.
patent: 6956343 (2005-10-01), Berroth et al.

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