Amplifier and method for detecting the bemf of a coil of a polyp

Electricity: motive power systems – Switched reluctance motor commutation control

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318439, H02K 2300

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active

054811678

ABSTRACT:
A circuit and method for detecting when the back emf of a motor coil passes a predetermined level includes circuitry for providing a voltage proportional to the back emf of the motor coil, and circuitry for providing a voltage proportional to a reference potential. A first bias voltage is added to the voltage proportional to the back emf to produce a first added voltage, and a second bias voltage is added to the reference potential when the back emf of the motor coil is expected to change in a predetermined direction to produce a second added voltage. A comparator produces an output change when the first added voltage becomes larger than the second added voltage at the predetermined level.

REFERENCES:
patent: 4169990 (1979-10-01), Erdman
patent: 4390826 (1983-06-01), Erdman et al.
patent: 4636936 (1987-01-01), Boyd et al.
patent: 4922169 (1990-05-01), Freeman
patent: 4928043 (1990-05-01), Plunkett

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