Motor control apparatus

Details Motor control apparatus Motor control apparatus

2006-09-26

2006-09-26

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

Reexamination Certificate

active

07113376

ABSTRACT:
In a control apparatus for a motor, an over-current protection circuit detects an abnormality in a motor current forcibly turns off a MOSFET. The over-current protection circuit has a timer function and a time switching function. In the timer operation, the over-current protection circuit stops an abnormality detection signal for an ON time period before producing the signal for an OFF time period when a current flowing through the motor exceeds a predetermined threshold value. The time switching function is for controlling to lengthen the OFF time period to a relatively larger value in comparison with the ON time period.

REFERENCES:
patent: 6016965 (2000-01-01), Yoshimura et al.
patent: A-H02-101992 (1990-04-01), None
patent: A-H09-284999 (1997-10-01), None
patent: A-H09-308261 (1997-11-01), None
patent: A-H10-8959 (1998-01-01), None
patent: A-H10-42586 (1998-02-01), None

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