| CPC H02P 6/15 (2016.02) | 9 Claims |
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1. A motor controller circuit having a rotational speed locking mechanism, which is applicable to a motor, the motor controller circuit comprising:
a signal generator circuit, including:
a first signal generating circuit configured to output a first waveform signal, and to reset the first waveform signal according to a commutation state of the motor each time when the motor commutates; and
a second signal generating circuit configured to output a second waveform signal;
an output signal generating circuit connected to the first signal generating circuit and the second signal generating circuit, and configured to output a waveform output signal according to the first waveform signal from the first signal generating circuit and the second waveform signal from the second signal generating circuit;
a motor control circuit connected to the output signal generating circuit, and configured to output an on-time signal according to the waveform output signal from the output signal generating circuit; and
a motor driving circuit connected to the motor control circuit and the motor, and configured to output a driving signal to the motor to drive the motor to rotate according to the on-time signal;
wherein, each time when the motor commutates at one of a plurality of commutation time points of the motor, duty cycles of the on-time signal outputted, by the motor control circuit, within a time interval between the one and a next one of the plurality of commutation time points are the same as that outputted within a time interval between the one and a previous one of the plurality of commutation time points, under the condition that the motor rotates at a constant rotational speed.
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