Error signal control circuit for a phase-lock-loop sensorless mo

Details Error signal control circuit for a phase-lock-loop sensorless mo Error signal control circuit for a phase-lock-loop sensorless mo

1996-09-25

1998-07-21

Ro, Bentsu

Electricity: motive power systems

Armature circuit control

Plural sources of voltage

318459, 3889281, H02P 600

Patent

active

057839204

ABSTRACT:
The present invention includes a circuit for detecting a back EMF signal for a motor. The circuit includes a circuit 200 for detecting when the back EMF signal from the motor is either a positive EMF signal or a negative EMF signal, a positive source circuit 302 to supply a positive current, a negative source circuit 304 to supply a negative current, a switch circuit 120 and 122 to connect the positive source circuit to an output circuit 410 of the back EMF signal circuit and to connect the negative source circuit to the output circuit, and the output circuit outputting the positive source current while the positive EMF signal is detected and outputting the negative current while the negative EMF signal is detected.

REFERENCES:
patent: 4658194 (1987-04-01), Richter et al.
patent: 5631999 (1997-05-01), Dinsmore

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