Back electromotive force detection circuit and motor driving control apparatus using the same

摘要

There are provided a back electromotive force detection circuit and a motor driving control apparatus using the same. The back electromotive force detection circuit includes a duty determining unit and a delay compensation unit. The duty determining unit outputs a differential level according to a duty of a driving control signal of a motor. The delay compensation unit performs delay compensation differently on each differential level to compensate for a delay in back electromotive force of the motor regardless of a variation in a duty of the driving control signal.

主权项

1. A back electromotive force detection circuit comprising:
a duty determining unit outputting a differential level according to a duty of a driving control signal of a motor; and a delay compensation unit performing delay compensation differently on each differential level to compensate for a delay in back electromotive force of the motor regardless of a variation in a duty of the driving control signal, wherein the delay compensation unit comprises n number of switches connected in parallel, and wherein the switches are connected to capacitors having different degrees of capacitance.