Motor drive circuit

Details Motor drive circuit Motor drive circuit

2008-11-25

2010-11-30

Leykin, Rita (Department: 2837)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S029000, C361S028000, C361S023000, C361S054000, C361S078000, C361S079000, C361S088000, C361S091300, C361S031000, C361S087000, C361S094000, C361S212000, C318S432000, C318S434000, C318S801000, C318S400290, C323S274000, C323S276000, C323S275000, C323S282000, C323S284000, C327S261000, C327S392000, C320S137000, C320S166000, C700S293000

Reexamination Certificate

active

07843674

ABSTRACT:
A motor-drive circuit comprising: a current-passage-control circuit to perform ON/OFF control of a drive transistor connected to a motor coil to pass current through the motor coil; an overcurrent-state-detection circuit to detect whether current passing through the drive transistor is in an overcurrent state where the current exceeds a predetermined threshold value; a charging and discharging circuit to start charging a capacitor in response to detecting the overcurrent state by the overcurrent-state-detection circuit and subsequently discharge the capacitor in response to not detecting the overcurrent state; and an overcurrent-protection-control circuit to stop the ON/OFF control to turn off the drive transistor, for an elapsed charging period for a charging voltage of the capacitor at a predetermined voltage to exceed a threshold voltage, and determine whether to perform such an overcurrent-protection-control as to turn off the drive transistor by detection of the overcurrent state, after the charging period has elapsed.

REFERENCES:
patent: 5444595 (1995-08-01), Ishikawa et al.
patent: 5574320 (1996-11-01), Shirai et al.
patent: 5710508 (1998-01-01), Watanabe
patent: 6288883 (2001-09-01), Chen
patent: 6717785 (2004-04-01), Fukuda et al.
patent: 6842064 (2005-01-01), Yamamoto
patent: 7215180 (2007-05-01), Nagata et al.
patent: 7345383 (2008-03-01), Zushi et al.
patent: 05-111144 (1993-04-01), None

Affiliated with

Also associated with

Rating

Motor drive circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor drive circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor drive circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4240817