Driver circuit for D.C. motor

Details Driver circuit for D.C. motor Driver circuit for D.C. motor

1990-02-27

1990-12-11

Shoop, Jr., William M.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, H02K 2900

Patent

active

049773569

ABSTRACT:
A driver circuit for a D.C. motor includes a first output transistor forming an inflow path for a driving current to the stator coil, and a second output transistor forming an outflow path for the driving current from the stator coil. The two output transistors are incorporated in a semiconductor integrated circuit; each output transistor is an n-p-n transistor in order to increase its current density. One current-mirror circuit including a pair of p-n-p transistors is connected to the first output transistor. Another current-mirror circuit including a pair of n-p-n transistors is connected to the second output transistor. To each output transistor a driving control signal is supplied via the respective current-mirror circuit. The result is that the ratio of inflow and outflow currents is determined by the mirror ratio of the current-mirror circuits, thus resulting in minimized ratio fluctuation. Also the mirror ratio can be controlled by the emitter area ratio of the current-mirror circuits.

REFERENCES:
patent: 3309592 (1967-03-01), Farre
patent: 3541408 (1970-11-01), Schwendtner
patent: 3938014 (1976-02-01), Nakajima
patent: 4230976 (1980-10-01), Muller
patent: 4435673 (1984-03-01), Hagino et al.
patent: 4511828 (1985-04-01), Wada
patent: 4544868 (1985-10-01), Murty
patent: 4730150 (1988-03-01), Lee et al.

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