Patent ID: 8102133

Claim:
A control circuit for a BLDC motor, comprising: a torque-control circuit, coupled to said BLDC motor for generating a torque-feedback signal in response to a switching current of said BLDC motor; a reference-signal generator, generating a torque-reference signal; an amplifying circuit, coupled to receive said torque-feedback signal and said torque-reference signal for generating a torque-control signal; wherein said torque-control circuit, said reference-signal generator and said amplifying circuit form a torque-feedback loop; an over-current detection circuit, coupled to generate a reset signal in response to said switching current of said BLDC motor; and a PWM circuit, generating a PWM signal to drive said BLDC motor in response to said torque-control signal, a speed-control signal and/or said reset signal; wherein said reset signal is generated when said switching current of said BLDC motor exceeds a threshold; a pulse width of said PWM signal is determined in response to said torque-control signal, said speed-control signal, and/or said reset signal.