Patent ID: 8022648

Claim:
A motor driving circuit for providing a full-wave electric current through a single-phase motor coil, the motor driving circuit comprising: a position detection unit arranged to detect a pole position of a multipole magnetized rotor magnet; a turn-on signal generation unit arranged to set a conducting direction in the motor coil according to an output of the position detection unit; and switching devices defining an H-bridge circuit arranged to provide a bidirectional electric current through the motor coil in cooperation with the turn-on signal generation unit; wherein the turn-on signal generation unit includes a differential amplifier arranged to amplify the output of the position detection unit to produce a trapezoid wave signal, and a square wave generation circuit arranged to convert the trapezoid wave signal to a square wave signal; the trapezoid wave signal and the square wave signal are supplied to a respective control terminal of each of first and second lower switching devices in the H-bridge circuit; the first lower switching device, to which the square wave signal is supplied, is turned on and off according to a voltage level of the square wave signal; the second lower switching devices, to which the trapezoid wave signal is supplied, is turned on and off when a voltage level of the trapezoid wave signal becomes higher than an operation voltage of the second lower switching device, the operation voltage being higher than a threshold level at which the trapezoid wave signal is converted to the square wave signal; and a non-conducting interval is provided to the motor coil according to the operation voltage of the second lower switching device.