Control of slew rate during turn-on of motor driver transistors

Details Control of slew rate during turn-on of motor driver transistors Control of slew rate during turn-on of motor driver transistors

1994-09-30

1997-08-26

Masih, Karen

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 318138, 323315, H01R 3946

Patent

active

056613830

ABSTRACT:
A circuit for controlling the slew rate at a motor coil during turn-on in a commutation sequence is disclosed. The disclosed circuit includes a switched current mirror that receives the commutation signal, and that provides a mirrored current to the input of an integrating buffer amplifier when its associated coil is to be driven. The integrating buffer amplifier includes an amplifier with a feedback capacitor, and a current source connected at its input, for reducing the voltage slew rate during turn-off of the transistor. The mirrored current applied to the input of the integrating buffer amplifier is greater than that of the current source, but limited so as to reduce the voltage slew at the coil.

REFERENCES:
patent: 4274014 (1981-06-01), Schade, Jr.
patent: 4429270 (1984-01-01), Davies et al.
patent: 4527102 (1985-07-01), Gotou
patent: 5191269 (1993-03-01), Carobolante
patent: 5477489 (1995-12-01), Wiedmann

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