Power tool and control method therefor

A power tool, comprising:

• a brushless motor comprising a rotor and a plurality of phases of stator windings;
• and
• a control circuit configured to control a working state of the motor;
• wherein the control circuit comprises a driver circuit comprising a plurality of high-side switching elements and a plurality of low-side switching elements and a controller electrically connected to at least the driver circuit and capable of outputting a control signal to control a first switching element in the driver circuit to be turned on so as to switch from the driver circuit from a driving state to a freewheeling state, the controller is configured to detect an electrical parameter of the first switching element in the driver circuit and control time during which the driver circuit is in the freewheeling state according to a relationship between the electrical parameter and a preset parameter threshold to avoid a braking phenomenon of the control circuit, and the first switching element is a turned off switching element among one of the plurality of high-side switching elements and one of the plurality of low-side switching elements connected to a same one of the plurality of phases of stator windings in the driver circuit.