Motor starting circuit with low cost comparator hysteresis

Details Motor starting circuit with low cost comparator hysteresis Motor starting circuit with low cost comparator hysteresis

H - Electricity

02

P

318/108

H02P 1/44 (2006.01)

Patent

CA 1285314

Abstract A low cost, low part content single phase AC induction motor control starting circuit is provided which is speed sensitive, load sensitive and AC line voltage fluctuation insensitive. A dual comparator chip (20, 22) senses and compares relative magnitudes of AC line and auxiliary winding voltages (48, 40) to de-energize the auxiliary winding (2) at cut-out speed, and automatically re-energize the auxiliary winding at cut-in speed to accelerate or restart the motor from an overload or stall condition. Hysteresis circuitry (20, 50, 52, 57, 80) provides a lower cut in speed than cut- out speed. Simplified power supply and voltage detection circuitry is also disclosed.

572646

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