Patent ID: 6969962

Claim:
A DC motor drive circuit for driving a single-phase brushless motor including a stator with a single-phase winding and a rotor having a rotor magnet arranged to be opposed to the stator, the DC motor drive circuit comprising: a position detecting portion for producing two output signals having different phases that correspond to a rotational position of the rotor; a current controlling portion for controlling current supply to the winding in accordance with the output signal of the position detecting portion; and a phase advancing portion for receiving two output signals from the position detecting portion and for producing two phase-advanced output signals in which the phases of the output signals are advanced, the phase advancing portion including a differential amplifier having two transistors, and a circuit network made of a capacitor and a resistor that is connected between emitters of the two transistors; wherein the two output signals from the position detecting portion are respectively supplied to bases of the two transistors, and the phase-advanced output signals are obtained from collectors of the two transistors and are supplied to the current controlling portion so that the timing for supplying current to the winding is advanced.