Sensorless motor control circuit without employing any mask process
AssigneeAimtron Technology Corp.
InventorsChi-Yang Chen, Feng-Rurng Juang
Life of this patent
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Abstract
A motor control circuit includes a detector circuit, a comparator circuit, a sifter circuit, and a driver circuit. The detector circuit is coupled to a plurality of coils of a motor for generating a detection signal. The detection signal is in association with a terminal voltage of a selected-to-be-floated coil of the plurality of coils. Based on comparison between the detection signal and a reference voltage, the comparator circuit generates a comparison signal. The sifter circuit receives in sequence a first-time crossing and a second-time crossing from the comparison signal, and generates an indication signal in response to the second-time crossing. The driver circuit controls a commutation of the motor in response to the indication signal.
Claims20
A motor control circuit applied to a motor having a plurality of coils, comprising:
- a detector circuit coupled to the plurality of coils for generating a detection signal representative of a voltage at a terminal of a selected-to-be-floated coil of the plurality of coils;
- a comparator circuit coupled to the detector circuit for comparing the detection signal and a reference voltage so as to generate a comparison signal;
- a sifter circuit coupled to the comparator circuit for receiving in sequence a first-time crossing and a second-time crossing of the comparison signal, and for generating an indication signal in response to the second-time crossing;
- and
- a drive circuit for controlling a commutation of the motor in response to the indication signal.
A motor controlling method applied to a motor having a plurality of coils, comprising:
- detecting a voltage at a terminal of a selected-to-be-floated coil of the plurality of coils so as to generate a detection signal;
- comparing the detection signal with a reference voltage so as to generate a comparison signal, wherein the comparison signal presents a first-time crossing and a second-time crossing;
- selecting out the second-time crossing among the first-time crossing and the second-time crossing;
- generating an indication signal in response to the second-time crossing;
- and
- controlling a commutation of the motor in response to the indication signal.
A zero-crossing detection circuit for controlling a commutation of a motor, comprising:
- a first circuit for generating a first signal representative of a back electrical motion force of a floated coil of the motor;
- a second circuit for comparing the first signal with a reference voltage so as to generate a second signal, wherein the second signal presents a first-time crossing and a second-time crossing;
- and
- a third circuit for receiving in sequence the first-time crossing and the second-time crossing, and generating a third signal in response to the second-time crossing, wherein the third signal is applied to control the commutation of the motor.
Dependencies are inferred from the claim text.