Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Reexamination Certificate
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.
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Gunther John E.
Leykin Rita
Sanyo Electric Co,. Ltd.
Sanyo Semiconductor Co. Ltd.
Sereboff Steven C.
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