Back electromotive force detection circuit, and motor driving control apparatus and motor using the same
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorSoo Woong LEE
Life of this patent
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Abstract
There are provided a back electromotive force detection circuit, and a motor driving control apparatus and a motor using the same. The back electromotive force detection circuit includes: a voltage generating unit generating a voltage in inverse proportion to a duty ratio of a pulse width modulation (PWM) signal; a variable amplifier controlling a gain according to the voltage generated by the voltage generating unit, and amplifying back electromotive force according to the controlled gain; and a comparator comparing an output from the variable amplifier with a pre-set reference signal, and outputting a zero-crossing signal of the back electromotive force.
Claims15
A back electromotive force detection circuit comprising:
- a voltage generating unit generating a voltage in inverse proportion to a duty ratio of a pulse width modulation (PWM) signal;
- a variable amplifier controlling a gain according to the voltage generated by the voltage generating unit, and amplifying back electromotive force according to the controlled gain;
- and
- a comparator comparing an output from the variable amplifier with a pre-set reference signal, and outputting a zero-crossing signal of the back electromotive force.
A motor driving control apparatus comprising:
- a driving signal generating unit generating a pulse width modulation (PWM) signal for controlling driving of a motor device;
- a back electromotive force detection unit detecting a zero-crossing point of back electromotive force of the motor device, independently from a change in a rotational speed of the motor device;
- and
- a controller determining a phase conversion time of the motor device according to the zero-crossing point, and controlling the driving signal generating unit to adjust the PWM signal.
A motor comprising:
- a motor device rotating according to a pulse width modulation (PWM) signal;
- and
- a motor driving control apparatus determining a phase conversion time of the motor device by detecting a zero-crossing point of back electromotive force of the motor device independently from a change in a rotational speed of the motor device, and controlling driving of the motor device by providing the PWM signal reflecting the phase conversion time to the motor device.
Dependencies are inferred from the claim text.