Circuit for providing drive current to a motor using a sensefet

Details Circuit for providing drive current to a motor using a sensefet Circuit for providing drive current to a motor using a sensefet

1992-05-29

1994-12-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327581, 327427, 327432, H03K 301

Patent

active

053748573

ABSTRACT:
A circuit for providing drive current to a coil of a motor uses a sensefet current sensing device having a sense node and a source node. The source node is connected to deliver current to the coil, wherein a "sense" current proportional to said delivered current is produced on the sense node. An amplifier is connected to sense a voltage between said sense and source nodes to produce an output voltage to force a voltage on the sense node to be the same as a voltage on the source node. A pass element is connected to route said "sense" current to an output node. The circuit produces an output that is suitable for use as a feedback signal in a motor control system.

REFERENCES:
patent: 4427903 (1984-01-01), Sugimoto
patent: 4667121 (1987-05-01), Fay et al.
patent: 4675561 (1987-06-01), Bowers et al.
patent: 4937469 (1990-06-01), Larson et al.
patent: 5032745 (1991-07-01), Izadinia et al.
patent: 5061863 (1991-10-01), Mori et al.
patent: 5079456 (1992-01-01), Kotowski et al.
patent: 5081379 (1992-01-01), Korteling
patent: 5220207 (1993-06-01), Kovalcik et al.

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