Motor control circuit and motor drive system using the same

Details Motor control circuit and motor drive system using the same Motor control circuit and motor drive system using the same

1992-07-21

1993-11-23

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318808, H02P 700

Patent

active

052647749

ABSTRACT:
A motor control circuit and a motor drive system using the same, in which a first transistor between the collector-emitter of which a first current in response to a drive signal for driving a motor is flown and a second transistor the base of which is connected to the base of the first transistor and between the collector-emitter of which a second current in response to the first current is flown are included, and the second current or a current dependent upon the second current is outputted to the coil of the motor as a motor drive current and the second transistor is turned to the saturation condition when the voltage at the coil rises more than a predetermined value, comprising a detection circuit of the saturation condition which is connected to the base of the second transistor and generates a detection signal in response to a voltage variation of the base of the second transistor when the second transistor operates under the saturation condition; and a feed-back circuit which decreases the second current by decreasing the first current flowing through the first transistor in response to the detection signal.

REFERENCES:
patent: 3707638 (1972-12-01), Nailen
patent: 4385265 (1983-05-01), Uzuka
patent: 4412159 (1983-10-01), Uzuka
patent: 4435673 (1984-03-01), Hagino et al.
patent: 4491770 (1985-01-01), Gotou
patent: 4562386 (1985-12-01), Goff et al.
patent: 4608524 (1986-08-01), Yokobori
patent: 4987352 (1991-01-01), Ishii

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