Three-phase brushless motor driving circuit, three-phase brushless motor driver and compensation method

The invention provides a three-phase brushless motor driving circuit, a three-phase brushless motor driver and a compensation method, and the three-phase brushless motor driving circuit comprises an optocoupler isolation circuit, a dead zone compensation circuit, a logic processing circuit, a dead zone setting circuit and a driving and three-phase bridge circuit which are connected with one another. The problem of common-state direct connection of an output power tube can be effectively solved, the input PWM pulse width loss can be reduced, and the problem that a motor cannot normally rotate due to the fact that the input PWM pulse width is small is avoided; according to the method, the dead time of the three-phase brushless motor driver is obtained, the compensation time is determined, then the capacitance value of the first capacitor in the dead compensation circuit is adjusted, the optocoupler output signal is pre-broadened, the compensation dead time can be adjusted according to the dead time, and the pro