Patent ID: 7157877

Claim:
A brushless motor driving device comprising: a current detecting unit for detecting phase-currents of a brushless motor; a voltage detecting unit for detecting phase-voltages of the brushless motor; a motor driving unit comprising a switching element for carrying out duty-driving on the brushless motor; and a signal input portion including a plurality of input terminals to which detection values of the phase-currents and detection values of the phase-voltages are alternately input, wherein one of the detection values of the phase-currents that has a first characteristic and one of the detection values of the phase-voltages that has a second characteristic are input to adjacent input terminals of the plurality of input terminals, wherein the first characteristic comprises one of an increase and a decrease of the one of the detection values of the phase-currents with increase in duty and the second characteristic comprises the other of the increase and the decrease of the one of the detection values of the phase-voltages with increase in duty.