Motor circuit
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United States of America Patent
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-
Aug 25, 1998
Grant Date -
N/A
app pub date -
Feb 28, 1997
filing date -
Feb 28, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A motor control circuit for a d.c. commutator-type motor includes a semi-conductor driver circuit with a current sensor which provides an output voltage signal representing the instantaneous current in the motor. A detector circuit analyses the output signal of the sensor to provide pulses indicating the motor shaft position. The detector circuit includes a level-shifting, scaling and filtering circuit which substantially removes frequency components below a predetermined level and a pulse generator driven by the level shifting, scaling and filtering circuit.
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