Speed-adjustable motor control circuit

The utility model discloses a speed-adjustable motor control circuit, which relates to the technical field of motor control, and comprises a power supply input module used for supplying direct current voltage and supplying power to a power supply conversion module and a protection module; the power supply conversion module is used for outputting constant voltage through a voltage stabilizer and supplying the constant voltage to the protection module, the PWM pulse generation module and the MOS tube driving module; and the protection module is used for sampling the supply voltage of the power supply input module and comparing the supply voltage with the output voltage of the power supply conversion module. Compared with the prior art, the beneficial effects of the utility model are that the PWM pulse generation module generates an adjustable PWM pulse signal so as to drive the motor to work; and meanwhile, the duty ratio of PWM pulse signals output by the PWM pulse generation module is adjustable, so that the