Motor drive device and drive method

Details Motor drive device and drive method Motor drive device and drive method

2006-10-11

2009-11-24

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Braking

C318S375000, C318S432000, C363S041000, C363S042000

Reexamination Certificate

active

07622873

ABSTRACT:
A reverse current detection unit detects the direction of the motor current during the synchronous rectifier period based on the polarity of the on voltage of a switching device contained in the motor current path, and outputs a reverse current detection signal representing the result of this detection to the PWM control unit. Change in the output of the PWM control unit that generates the drive signal for a particular switching device in the drive unit is controlled based on the reverse current detection signal and the energizing pattern of the drive unit is changed when motor current is detected in the synchronous rectifier period to be flowing in the opposite direction as in the urging period. The flow of motor current to the power supply is thus reduced and a rise in the power supply voltage can be prevented.

REFERENCES:
patent: 3719873 (1973-03-01), Graf
patent: 5309078 (1994-05-01), Cameron
patent: 5375028 (1994-12-01), Fukunaga
patent: 5436819 (1995-07-01), Mikami et al.

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