Patent ID: 9374029
Filing Date: 2016-06-21
CPC Classification: G06F,H02P,H03K

Claim Text:
1. A motor driving circuit configured to receive a Hall signal, which comprises a first signal and a second signal that are complementary, from a Hall sensor, and to drive a motor, the motor driving circuit comprising: a first A/D converter and a second A/D converter respectively configured to perform analog/digital conversion of the first signal and the second signal of the Hall signal so as to generate a third signal and a fourth signal in the form of digital signals; a differential conversion circuit configured to generate a fifth signal in the form of a single-ended signal that corresponds to the difference between the third signal and the fourth signal; an offset correction circuit configured to correct offset of the fifth signal so as to generate a sixth signal; an amplitude control circuit configured to stabilize the amplitude of the sixth signal to a predetermined target value, and to generate the absolute value of the resulting value, so as to generate a seventh signal; a control signal generating unit configured to generate a control signal based upon the seventh signal; a driver circuit configured to drive the motor according to the control signal; and a timing detection circuit configured to receive a signal that corresponds to the Hall signal output from the Hall sensor, and to generate a timing signal which is asserted at a predetermined timing in every cycle of the Hall signal, the timing detection circuit comprising: wherein the amplitude control circuit sets the value of the seventh signal for the amplitude of the seventh signal at a timing at which the timing signal is asserted.